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Ted Mooney, P.E. RET

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Any difference between Dichromate and Trichromate?

Sir/Madam:

I work in Ship Repair Facility here in Japan. Our facility can perform dichromate finishes, and Japanese companies only do trichromate. What is the difference?

Ruben Delarosa
Production Specialist - Yokosuka, Japan
March 7, 2008

Hi, Ruben. When individual words are presented with limited context it can be difficult or impossible to know what they mean. Dichromate is Cr₂O₇^-2 Trichromate would be, what, Cr₃O₁₀^-2? I don't think such an anion exists.

My suspicion is that someone somewhere is telling you that you should be using RoHS compatible trivalent "chromate", not "trichromate". Good luck

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 10, 2008

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