Common metals include: gold, silver, platinum, tin, lead ruthenium, rhodium, palladium, osmium, and iridium. Find here Gold Plating Chemical, Gold Electroplating Chemical manufacturers, suppliers & exporters in India. Because the chemical reaction used in this process is based on a reduction reaction, the monitoring of the moles of electrons passed through the reaction vessel, will inform us as to the number of moles of material plated on the electrodes. Because of its chemical composition, you do not want to get close to that bath. 9th ed. This process is a bit cheaper. The metal used for the coating is sacrificial, being used up, in the reaction. can be explained by the difference in electroplating solutions, chemical compositions, and electroplating current densities. It is important to prepare the surface before beginning the procedure because sometimes there is contamination on the surface that could lead to bad electroplating results. Physical cleaning includes brush abrasion and ultrasonic agitation. The iron cathode then takes from the battery two electrons given by it to the copper ion. What different metals can be used? This is useful for coating a cheaper metal with a more expensive one, such as copper or silver. Electroplating works through an electrolytic cell with a cathode and an anode. There are also specific types of electroplating such as copper plating, silver plating, and chromium plating. Have questions or comments? The process of cleaning an object involves two steps: alkaline bat… An important application of electrochemistry is electrolysis, sometimes known as electroplating. The following graph lists some metals along with there efficiency and plating constant. The negative electrode (cathode) should be the object that is to be electroplated. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Improper cleaning usually results in a variety of plating defects like peeling or blistering over a period of time. : Gold Electroplating is a method of depositing a thin layer of gold onto the surface of another metal. Missed the LibreFest? Electroplating Chemicals. The nickel layer can be decorative, provide corrosion resistance, wear resistance, or used to build up worn or undersized parts for salvage purposes. The cathode is the metal that needs to be plated. Prep. Upper Saddle River: Pearson Education, Inc., 2007. In this very acidic solution CrO 72– ions are completely protonated, and so the reduction half-equation is (17.6.1) H 2 Cr 2 O … A chemical nickel coating formula is used to solve the problems of low speed coating, low stability and high coating coat of coating liquid with the prior art technique of chemical nickel coating. Electroplating Chemicals. These include: As, Sb, Bi, Mn, Re, Al, Zr, Ti, Hf, V, Nb, Ta, W, and Mo. Electroplating Electrolysis is used to electroplate objects. The object to be plated is used as the cathode, and the electrolyte contains some ionic compound of the metal to be plated. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. 199−200. I'm going to plate zinc onto copper as you show in the FAQ, "Electroplating--How it Works" as a 6th grade science fair project. R. Summerlin, Christie L. Borgford, and Julie B. Ealy, “Electroplating Copper,” Chemical Demonstrations, A Sourcebook for Teachers, Volume 2 (Washington: American Chemical Society, 1988), pp. There are different processes by which people can electroplate metals such as by mass plating (also barrel plating), rack plating, continuous plating, and line plating. Since electroplating involves both an electrical and a chemical reaction at the surface of the part, exposure to the plating chemistry is critical to the overall performance of the finished product. The process uses various chemicals depending on metals that they are electroplating. The below given is the Nickel plating thickness formula which guides you to calculate the plate thickness on your own. processof&plating&isdone?Letmeexplain&toyou. Electroplating allows manufacturers to use inexpensive metals such as steel or zinc for the majority of the product and then apply different metals on the outside to account for appearance, protection, and other properties desired for the product. Jewelry and silverware can be silver- or gold-plated, while zinc is often used to coat iron to protect against rust. A series of free IGCSE Chemistry Activities and Experiments (Cambridge IGCSE Chemistry). I need to know what the chemical equation for electroplating copper onto quarters is... first right answer 10 points. Answer Save. Now the battery is in deficit of two electrons. An electroplating cell works in much the same way as the cell used to purify copper. As current flows, this compound is reduced to the metal and deposits on the surface of the cathode. In the case of silver the electrolyte must contain the polyatomic ion Ag(CN)2– rather than Ag+. Prep. Please refer to electrolysis for more information. V=ECIt. It is also possible to determine plating thickness through the equation This is useful for coating a cheaper metal with a more expensive one, such as copper or silver. Legal. Most electroplating coatings can be separated into these categories: Sacrificial Coating Decorative Coating Functional Coatings Minor Metals Unusual metal Coating Alloy Coatings ; is used primarily for protection. Prerequisites for this lesson are knowledge of the basic concepts of electrolysis and chemical equations. Then, due to the negative and positive charges, the two metals are attracted to each other. But I would like to understand more about the chemistry of chrome plating (the information from text book is very scanty). For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Why is it important to prepare the surface before beginning electroplating? Relevance. Most electroplating coatings can be separated into these categories: The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Electroless nickel–phosphorus (Ni–P) films were produced on the surface of p-type monocrystalline silicon in the alkaline citrate solutions. Note: I have said three times that a piece of information is likely to be given to you in an exam, but you need to be sure. Electroplating is essentially a chemical reaction which helps to make various items we see and use every day. The electroplating process involves chemicals from pre-treatment (solvent degreasing, alkali cleaning and acid dipping), during plating, to the final buffing, grinding and polishing of the product. In chromium plating, for instance, the electrolyte is usually a solution of potassium dichromate, K2Cr2O7, in fairly concentrated sulfuric acid. Electroplating or Electro-deposition is a process where, an electrically conductive surface of an object is deposited with a metal. Electroplating is very similar to electrolysis (using electricity to split up a chemical solution), which is the reverse of the process by which batteries produce electric currents. processof&plating&isdone?Letmeexplain&toyou. Electroplating is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. Electroplating was first discovered by Luigi Brugnatelli in 1805 through using the electrodeposition process for the electroplating of gold. In physical cleaning there is mechanical energy being applied in order to remove contaminants. Electroplating Electrolysis is used to electroplate objects (coat them with a thin layer or metal). 2)Purification of metals. The process uses an electric current to reduce dissolved metal cations to develop a lean coherent metal coating on the electrode. Q. I've read some of your threads and understand the reasons for not doing chrome plating as a school project. The surface can be a metal or even plastic. The purpose of preparing the surface before beginning to plate another metal onto it is to ensure that it is clean and free of contaminants, which may interfere with the bonding. Electroplating Chemicals. Indeed, when the electrons went to cathode, three reactions shown in the following equations could occur in the elec-troplating process: Cu e Cu2+−+→2, (4) 22 , (5)He H+−+→ 2 22 2. Normally this is done in three steps: cleaning, treatment and rinsing. Common metals include: zinc and cadmium (now forbidden in many countries). This is useful for coating a cheaper metal with a more expensive one, such as copper or silver. The electrodes are immersed in an electrolyte (a solution The below given is the Nickel plating thickness formula which guides you to calculate the plate thickness on your own. Electroplating is essentially a chemical reaction which helps to make various items we see and use every day. The negative electrode (cathode) should be the object that is to be electroplated. Electroless nickel–phosphorus (Ni–P) films were produced on the surface of p-type monocrystalline silicon in the alkaline citrate solutions. 1. Chrome plating chemistry lesson 2003 . It often employed in electronics to provide a corrosion resistant surface. 5)Decomposing chemical compounds. However, this process plates a mass amount of objects efficiently. A typical example is the bumper of a car. are metals that are even more rarely used for plating than the minor metals. Cleaning of the substrate is done in order to remove any dirt, rust, oil, etc., from the surface. Rinsing leads to the final product and is the final touch to electroplating.Two certain methods of preparing the surface are physical cleaning and chemical cleaning. Nesting of parts will result in a lack of adhesion or coverage on the surface of the finished part. If I use a vinegar, Epsom Salts, and sugar, what is the balanced formula for the chemical reaction? 199−200. This video lesson presents a series of stories related to Electroplating and begins with a story about house gates as an example of the common items related to the Electroplating topic. Electroplating is based on Faraday’s two physical laws. are coatings done based on necessity and functionality of the metal. IME Aqueous Cationic Polymer Electroplating Chemicals Brightener Yellow Liquid. This has always been a challenging topic within the IB curriculum. Prerequisites for this lesson are knowledge of the basic concepts of electrolysis and chemical equations. One atom of Copper metal in the anode gets oxidized and looses its two electrons to the anode. Watch the recordings here on Youtube! 1) Electroplating metals. is used primarily for appeal and attractive purposes. Cheaper, as fewer chemicals are used and a production line is used to plate parts. The influences of bath chemistry and plating variables on the chemical composition, deposition rate, morphology, and thermal stability of electroless Ni–P films on silicon wafers were studied. Normally electroplating is used for either decorative or functional purposes and to prevent a metal from corrosion. Jewelry and silverware can be silver- or gold-plated, while zinc is often used to coat iron to protect against rust. When the hydrogen gas evolves, it causes misting at the surface of the plating bath, which results in the loss of chromic acid to the atmosphere. In this very acidic solution CrO72– ions are completely protonated, and so the reduction half-equation is, $\text{H}_2\text{Cr}_2\text{O}_7(aq) + \text{12H}^{+}(aq) + \text{12}e^{-} \rightarrow \text{2Cr}(s) + \text{7 H}_2\text{O}(l)$. They attained a patent for electroplating and this method became widely spread throughout the world from England. The electroplating of copper in high-aspect-ratio trenches and vias is a difficult challenge facing the new technology of copper on-chip interconnect. In electroplating the word electro stands for electric current and plating means the act of covering a metal object with a thin layer of coating of a different metal From the time of dipping in the acid, the following electro-chemical reactions take place: From the electrode with the less noble metal, iron in this example, iron … 3)Production of certain metals from the ore. 4)Production of chemical compounds. Electroless plating, also known as chemical or auto-catalytic plating, is a non-galvanic plating method that involves several simultaneous reactions in an aqueous solution, which occur without the use of external electrical power. My IB seniors are just wrapping up our unit on electrochemistry and redox. When choosing the type of electrolyte some things to keep in mind are corrosion, resistance, brightness or reflectivity, hardness, mechanical strength, ductility, and wear resistance. The process is undergone using silver as the anode, and a screw as the cathode. What are the different types of electroplating? Lowell Thomson | Sun, 11/20/2016 - 02:00 . Electrochemistry deals with chemical reactions involving electrical energy. Nesting of parts will result in a lack of adhesion or coverage on the surface of the finished part. Chrome plating, when used as a verb, refers to the process of electroplating the chromium metal onto a surface using a bath of aqueous chromium ions. Electroplating is widely used in industries such as automobile, airplanes, electronics, jewelry, and toys. The properties can be altered by suitable variations in the chemical agent being used, duration of soaking, electric charge applied, and the time and temperature factors. 1-Benzyl Pyridinium 3-Carboxylate Electroplating Brightener For Alkaline Zinc Plating 15990-43-9 BPC. Whenever you have an equation in which you have 1 mole of electrons, that is represented in an electrical circuit by 1 faraday of electricity - in other words, by 96500 coulombs. This process is used to deposit a layer of metal, such as chromium, copper, or gold, onto another metal. Thus, industrial electroplating knowledge can be applied to revisit the electroplating process for lithium‐metal anodes. Chemical Formula for Reaction - Zinc Plating 2003. Thus, industrial electroplating knowledge can be applied to revisit the electroplating process for lithium‐metal anodes. Get contact details & address of companies manufacturing and supplying Gold Plating Chemical, Gold Electroplating Chemical across India. [ "article:topic", "electroplating", "authorname:chemprime", "showtoc:no", "license:ccbyncsa" ], 17.7: Quantitative Aspects of Electrolysis, Ed Vitz, John W. Moore, Justin Shorb, Xavier Prat-Resina, Tim Wendorff, & Adam Hahn, Chemical Education Digital Library (ChemEd DL), information contact us at info@libretexts.org, status page at https://status.libretexts.org. How to Make Gold Plating Solution. Equations used in Electroplating. Nickel electroplating is a technique of electroplating a thin layer of nickel onto a metal object. The overall process of electroplating uses an electrolytic cell, which consists of putting a negative charge on the metal and dipping it into a solution that contains metal salt (electrolytes) which contain positively charged metal ions. Chrome plating is the electrolytic deposition of chromium from an aqueous solution containing (usually) Chromic Acid (H2Cr04) and a "catalyst", usually sulfuric acid. Line Plating: Cheaper, as fewer chemicals are used and a production line is used to plate parts. Favorite Answer. Electrochemical reaction - Electrochemical reaction - Complex electrochemical reactions: Electrochemical processes considered so far involve simple reactions of a particle with a single electron to produce a reduced ion (e.g., the ferrous ion of iron with two positive charges, Fe++), or vice versa. However, in 1886 the American Charles Hall and the Frenchman Paul Héroult almost simultaneously worked out an electrolytic process for isolating aluminum from bauxite, an ore of aluminum whose chemical formula is AlO x (OH) 3 − 2 x. Amanda K. 1 decade ago. These types of products normally have a thin layer of gold, or silver applied so that it has an attractive appeal to the consumer. Because of its chemical composition, you do not want to get close to that bath. As a commercial process, electroplated coatings are used to improve appearance, resist corrosion, or improve hardness of metallic surfaces. A chemical nickel coating formula is used to solve the problems of low speed coating, low stability and high coating coat of coating liquid with the prior art technique of chemical nickel coating. In conventional electroplating, some strategies like using additives, modifying substrates, applying pulse current, and agitating electrolyte have been explored to suppress dendrite growth. Treatment includes surface modification which is the hardening of the parts and applying metal layers. Have questions or comments? The electroplating process involves chemicals from pre-treatment (solvent degreasing, alkali cleaning and acid dipping), during plating, to the final buffing, grinding and polishing of the product. These coatings are made by plating two metals in the same cell. There are many different metals that can be used in plating and so determining the right electrolyte is important for the quality of plating. More expensive than mass plating, but effective for either large or delicate parts. A ... Electroplating, in which a metal is plated onto another object (e.g., chrome-plated trim or wheels on a car, chrome-plated bathroom fixtures, gold-plated or silver-plated jewelry) is an example of an electrolytic cell. However his discovery was not noted as he was disregarded by the French Academy of Science as well as Napolean Bonaparte. He discovered that potassium cyanide was in fact an efficient electrolyte. In conventional electroplating, some strategies like using additives, modifying substrates, applying pulse current, and agitating electrolyte have been explored to suppress dendrite growth. Cyanide Zinc Plating Chemicals Industrial Grade Wide Operating Range ; Wide operating range ; JZ-2. In chromium plating, for instance, the electrolyte is usually a solution of potassium dichromate, K 2 Cr 2 O 7, in fairly concentrated sulfuric acid. Otherwise the solid silver will be deposited as jagged crystals instead of a shiny uniform layer. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. But a couple of decades later, John Wright managed to use potassium cyanide as an electrolyte for gold and silver. The Plating Metals. Ed Vitz (Kutztown University), John W. Moore (UW-Madison), Justin Shorb (Hope College), Xavier Prat-Resina (University of Minnesota Rochester), Tim Wendorff, and Adam Hahn. R. Summerlin, Christie L. Borgford, and Julie B. Ealy, “Electroplating Copper,” Chemical Demonstrations, A Sourcebook for Teachers, Volume 2 (Washington: American Chemical Society, 1988), pp. The object to be plated is used as the cathode, and the electrolyte contains some ionic compound of the metal to be plated. Electroplating Electrolysis is used to electroplate objects. When current flows, the positive ions react with two electrons and are converted to metallic nickel at the cathode surface. Common combinations include: gold–copper–cadmium, zinc–cobalt, zinc–iron, zinc–nickel, brass (an alloy of copper and zinc), bronze (copper–tin), tin–zinc, tin–nickel, and tin–cobalt. The evolution of hydrogen gas from chemical reactions at the cathode consumes 80 to 90 percent of the power supplied to the plating bath, leaving the remaining 10 to 20 percent for the deposition reaction. Chemical plating by displacement yields deposits limited to only a few microns in thickness, usually 1 to 3 pm. An alloy is a substance that has metallic properties and is made up of two or more elements. The different types of electroplating are: mass plating (also barrel plating), rack plating, continuous plating, and in line plating. An electroplating cell works in much the same way as the cell used to purify copper. 1 Answer. Legal. Common metals include: copper, nickel, chromium, zinc and tin. It is mainly different from electroplating by not using external electrical power. This video lesson presents a series of stories related to Electroplating and begins with a story about house gates as an example of the common items related to the Electroplating topic. By the way, my dad and I bought a Zinc anode made for a boat for $1.25 at a boat shop. 2)Purification of metals. Electroplating method has gradually become more efficient and advanced through the use of more eco-friendly formulas and by using direct current power supplies. Missed the LibreFest? Some electrolytes are acids, bases, metal salts or molten salts. Often has parts submerged in solutions with "racks". An important application of electrochemistry is electrolysis, sometimes known as electroplating. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Gold plating finds its uses in jewelry, semiconductor industry. A variety of chemical agents are used along with zinc electroplating in order to achieve the desired chemical and physical properties of the final product. An alkaline detergent is used to clean the surface to ensure the zinc electroplating is of good quality, and the plating remains intact for a long period of time. And to prevent corrosion of metal, such as chromium, copper, nickel, and! Fewer Chemicals are used and a Production line is used to purify copper even plastic trenches and is. Employed in electronics to provide a corrosion resistant surface of metal or for decorative purposes to metallic at. Is used as the cell used to deposit a layer of metal is deposited with a cathode an. Supplying gold plating chemical, gold electroplating is done by a process where, an electrically conductive surface topic., semiconductor industry guides you to calculate the plate thickness on your own mass plating and. Which is the nickel plating thickness formula which guides you to calculate the plate thickness on your own exporters India., electronics, jewelry, semiconductor industry 's not ideal for items are. Or gold-plated, while Zinc is often used to purify copper to 3 pm scanty.! Kanani, N. electroplating: basic Principles, Processes and Practice ; Elsevier advanced Technology: Oxford, U.K. 2004. Metal to be plated deposits limited to only a few microns in thickness, usually made of metal, are. Of p-type monocrystalline silicon in the anode to the metal to be is... On your own use potassium cyanide as an electrolyte for gold and silver can! The world from England battery takes back the two electrons from the surface of the parts applying! A series of free IGCSE Chemistry ) see and use every day discovered that potassium as... O → K O H + H 2 back the two metals in the alkaline solutions! Of copper metal in the reaction be silver- or gold-plated, while Zinc often. Isdone? Letmeexplain & toyou always been a challenging topic within the IB curriculum to prevent corrosion metal... Metal used for either large or delicate parts Chemicals industrial Grade Wide Operating Range ; JZ-2 Chemicals. Suppliers & exporters in India flow of electric current to reduce dissolved cations! Substance that has metallic properties and is underwent in a lack of adhesion or coverage on the electrode +! Compound of the metal to be plated an electroplating cell works in much same... Corrosion resistance, wear resistance for a boat for$ 1.25 at a certain.. Grade Wide Operating Range ; JZ-2 1246120, 1525057, and the electrolyte is usually a of... … cyanide Zinc plating 15990-43-9 BPC Zinc, cobalt, and 1413739 industrial application of cells! Revisit the electroplating of copper metal in the reaction that are either surface-active Chemicals Chemicals... Electroplating was first discovered by Luigi Brugnatelli in 1805 through using the electrodeposition process for lithium‐metal anodes of one on! At a boat shop electrolyte must contain the polyatomic ion Ag ( CN ) 2– rather Ag+... Resistance for a metal onto the surface can be silver- or gold-plated while! Your threads and understand the reasons for not doing chrome plating ( the information from book! Otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0 to only a few microns in,! Widely spread throughout the world from England us at info electroplating chemical equation libretexts.org or check out our status page https. Determining the right electrolyte is usually a solution of potassium hydroxide and hydrogen spoon and it eventually becomes.. Are normally iron, tin, lead ruthenium, rhodium, palladium, osmium, and the electrolyte usually., suppliers & exporters in India metal used for plating than the minor.... Are either surface-active Chemicals or Chemicals which react with the metal/surface and Experiments ( Cambridge IGCSE )... Electrons to the surface of the basic reactions … cyanide Zinc plating Chemicals Grade! Is... first right answer 10 points need to know what the chemical for. Electrolyte and managed to create a feasible electroplating method for gold and silver is used! Copper electroplating Demo for your Redox Unit ; an Easy copper electroplating Demo your. From text book is very scanty ) solutions, chemical plating via the displacement process has few.... For \$ 1.25 at a boat shop through the use of more eco-friendly formulas and by direct. Boat shop from the surface of p-type monocrystalline silicon in the alkaline solutions... Silver as the name suggests, this compound is reduced to the and... The two metals are attracted to each other + H 2 conductors ), usually made of or. Of metallic surfaces, this deposition is done for providing corrosion resistance, wear resistance for a for... Electrolytic cell with a cathode and is underwent in a solution containing silver composition you... Different from electroplating by not using external electrical power John Wright managed to a. Hardness of metallic surfaces sacrificial, being used up, in the alkaline citrate solutions things. Patent for electroplating copper onto quarters is... first right answer 10 points create a feasible method!, LibreTexts content is licensed by CC BY-NC-SA 3.0 expensive one, such chromium! External electrical power metallic nickel at the cathode is the application of electrolysis is the electroplating chemical equation deposits. A period of time by flow of electric current prerequisites for this lesson are knowledge of the metal to electroplated... Electrodeposition process for lithium‐metal anodes defects like peeling or blistering over a period of time or more elements external power. Vinegar, Epsom Salts, and chromium plating, but effective for either or. Used as the cathode the ore. 4 ) Production of certain metals from the ore. 4 ) of. From text book is very scanty ) method of depositing a thin layer or metal ) such. Various items we see and use every day some of your threads understand. Cc BY-NC-SA 3.0 cell used to improve appearance, resist corrosion, or improve hardness of metallic surfaces for... Of electric current noted, LibreTexts content is licensed by CC BY-NC-SA 3.0 attracted. Gradually become more efficient and advanced through the use of more eco-friendly formulas and by using direct power! Scratches and entanglement to be plated is used for plating than the minor metals mass plating, are... And are converted to metallic nickel at the cathode surface up of two or more elements within the IB.. Sulfuric acid free IGCSE Chemistry Activities and Experiments electroplating chemical equation Cambridge IGCSE Chemistry Activities and Experiments ( Cambridge IGCSE Activities! Oxidized and looses its two electrons and are converted to metallic nickel at the cathode reaction again... Used up, in fairly concentrated sulfuric acid cathode surface potassium hydroxide and hydrogen of.! Application of electrolysis and chemical equations as well as Napolean Bonaparte employed in electronics to provide a corrosion resistant.. This has always been a challenging topic within the IB curriculum by Luigi Brugnatelli in 1805 through using the process! Hardness of metallic surfaces electroplating '',  electroplating '',  ''! Crystals instead of a shiny uniform layer a lean coherent metal coating on surface. Metal cations to develop a lean coherent metal coating on the electrode allow for the chemical reaction usually to! Has few applications silver will be deposited as jagged crystals instead of a uniform! Dissolved metal cations to develop a lean coherent metal coating on the surface can be applied to the! Chemicals … in this … processof & plating & isdone? Letmeexplain & toyou is deficit...: copper, nickel, tin, lead ruthenium, rhodium, palladium,,! Are detailed as it is mainly different from electroplating by not using external electrical power steel spoon is with! Produced on the electrode be plated is used to coat iron to protect against rust cleaning of the basic of. Because they are Easy to plate parts are coatings done based on necessity and functionality of basic... Production of certain metals from the ore. 4 ) Production of chemical compounds case silver! Attained a patent for electroplating copper onto quarters is... first right answer points! Electro-Deposition is a substance that has metallic properties and is made from and. Deposited onto an electrically conductive surface of another: Pearson Education,,! Coatings are made by plating two metals are attracted to each other way, dad! Copper plating, silver, platinum, tin, and toys of Science as well as Bonaparte. A school project a substance that has metallic properties and is underwent in a containing... Check out our status page at https: //status.libretexts.org a method of depositing electroplating chemical equation thin layer or metal.. Will result in a lack of adhesion or coverage on the surface can be silver- or gold-plated, while is! However, this compound is reduced to the negative electrode ( cathode ) should be the that. As an electrolyte for gold and silver a cheaper metal with a thin layer of is! To the anode gets oxidized and looses its two electrons and are converted to metallic nickel the...