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Chemical Reaction occurring in salt spray testing

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Dear Sir,

1. I want to know the exact chemical reaction occurring during salt spray testing

2. Complex compunds formed on the samples which are coated with MFZn2-C ( Cr+3 ).

What is black and white rust formed on the surface on above mentioned samples?

3.Is there any alternative available for MFZn2-K ( Black passivation)coating which is free from Cr6+?

Vipin Kumar
Honda Siel cars India Limited - Delhi, INDIA

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