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Current efficiency in chromium plating is:

Current efficiency in chromium plating is: Correct Answer 12% to 15%

Chromium Electroplating:

  • It is a process of metal coating, which uses chromium substance or chromic acid.
  • Chromium is used because it is a metal substance that is resistive to corrosion while other metals like steel easily corrode when affected by wet air.
  • Chromium is widely used in the metal finishing industry for both directive and hard-chrome plating.
  • In durative application, the chrome is plated as a thin (0.25 – 0.8 μm) layer over metals to provide on economical and highly corrosion resistant deposit.
  • Bright chromium can be applied as continuous or discontinuous layers.
  • Chromium plating requires that the metal to be plated is immersed in a sodium cyanide/caustic soda solution as a pre-treatment, after which it is reversed free of alkative cyanide in running water, producing reverse tank overflow contaminated with alkali and cyanide.
  • Cathode current efficiency of chromium electroplating is low about 12 – 15% (more about 10 – 20%)
  • 80 – 90% of the electric current passing between the anode and the cathode is used for gaseous hydrogen formation.
  • Chromium has a high melting point, stable crystalline structure and moderate thermal expansion.

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In two types of stainless steel the ratio of chromium and steel are 2 : 11 and 5 : 21 respectively. In what proportion should the two types be mixed so that the ratio of chromium to steel in the mixed type becomes 7 : 32 = ?