Torque and Chrome

Reduction Half Reaction in Chrome plating?

I'm not sure what the reduction reaction is in the process of plating metals with chromium. thank you!!

Public Comments

1. i believe that the common ion of Chrome is Cr (2-) so the reaction is Cr(s) + 2 e^- --> Cr(2-)(aq)
2. The common oxidation state for Chromium is 3+. Cr3+(aq) + 3e- --> Cr(s)
3. There are two types of industrial chrome plating solutions: 1. Hexavalent chromium baths whose main ingredient is chromic anhydride, aka chromium trioxide. 2. Trivalent chromium baths whose main ingredient is chromium sulfate or chromium chloride. Trivalent chromium baths are not yet common, due to restrictions concerning color, brittleness, and plating thickness. either Cr6+ +6e- ----> Cr or Cr3+ +3e- ----> Cr depending on which type