Letter 10003

Corrosion Resistance in Hard Chrome Plating 

How to achieve maximum corrosion resistance in hard chrome plating. What are the influencing factors. We normally do CASS (Cupric chloride acitic acid spray test) for 96 hrs. We are looking at no corrosion in 96 hrs spray. We are using convensional chemistry and high speed chemistry. What are the precautions taken for hard chrome plating used in offshore applications.

Jayakrishnan.C
- Bangalore, India

Dear Jakiristan:

Use an underplate of nickel of at least 25 microns before chrome. This is top class of plating and should have no problems passing your test.

Bye,

Guillermo Marrufo
Monterrey, NL, Mexico

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