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"Will Manganese Phosphating adhere to Zamak or Zinc pieces?"



July 20, 2016

Q. Need to know if Phosphating will work on Zamak?

Dwayne Weber
Hobbyist - Chicago, Illinois
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July 2016

? Hi Dwayne. I'm not sure whether the deposition reaction will proceed properly because I've never heard of it being done. Manganese phosphate is generally for the purpose of "break-in" and oil retention, which would mostly apply to hardened steel components rather than zinc diecastings. So I think a better question might possibly be "what is a better approach for my application" rather than "can I get by with manganese phosphating".

Is this for lubricated parts, or are you intending to paint the parts, or is it for corrosion prevention? If lubricated, you could try it; if painted, you'd probably be better off with zinc phosphating which is sometimes done on zinc or zinc coated parts; for corrosion resistance, chromating would probably be better than phosphating, whether painted or not -- with the ideal being zinc plating followed by chromating followed by painting.

What exactly is the application? Thanks.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
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