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Letter 8013
Black Chromate Finishing
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I'm looking for a person who experties in black chromate
finishing. My problem is to get right ratio when do a new make up and
how to maintain it. Is there any method to make me easier when do a
new make up rather than testing in lab??
I`m hoping to get answer as soon as posible since my company line
having problem when do a new make up.
Rahman
- Selangor, Malaysia
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Forget about analytical help in determining additions to a black
chromate tank. There is no substitute for experienced personnel for
this process which is more an art than a science. Spend half a day
with your two part system and try various combinations. Use chlorine
free water both in the run up rinses and post rinses and the bath
will last lifelong. Decant the bath before every shift.
Regards,
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Khozema
Vahanwala
Saify Ind
Bangalore, Karnataka, India
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You have not told us if you are making the chromate solution
yourself. If this is the case, I do not suggest you to waste your
time on checking the solution. It is much better off to buy the
chromate from one of the big chemical companies. They will tell you
exactly the way to use it and the way to analyse the solution. In
addition, the formulas should be much more stable the self brew ones.
S. Y. Yuen
- Hong Kong, China
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