Electroplating By: Steph Magill
Definition • Electroplating- The process of coating an electrically conducting surface with a thin layer (seldom more than 0.001 in [0.025 mm] thick) of metal by electrolytic deposition.
Uses • One use for electroplating is covering zinc with copper in making coinage. • To Protect steel or other metals from rusting. Fore example metal bumpers on trucks. • To Make cans which are made from steel electroplated with tin. Which is good for foods.
How is Electroplating Related? • The process of electroplating causes redox reactions. We talked about redox reactions in class earlier. Which is an oxidation – reduction reaction. • Cations and Anions also deal with electroplating because cations of most metallic substances can be reduced, this fact is exploited in electroplating. • We learned about oxidation and reduction. This relates to electroplating because in the electroplating process oxidation is called Anode and reduction is called Cathode.
Example • This is a metallic object that needs to be a plate with a metal. First it fills a cell with a solution of a salt of the metal to be plated. Most of the time the salt (nickel chloride in the example) is simply dissolved in water and a little acid.
Example An example of a gold-plating cell.
Example The spoon is being reduced and is attracting the oxidized Ag+ ions which plates the spoon in Silver atoms.
Review Questions • Name one use for electroplating. • What is oxidation and reduction called in electroplating?
Internet Cites • http://www.finishing.com/faqs/howworks.html (picture) • http://wiki.answers.com/Q/Name_the_uses_for_electroplating (uses) • http://www.bookrags.com/research/electroplating-woc/ (definition) • www.images.google.com (picture) • www.images.google.com (picture)