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Alternatives to hex chromate for mechanical tin / zink plating

Alternatives to hex chromate for mechanical tin / zink plating

Alternatives to hex chromate for mechanical tin / zink plating

(OP)

Could anyone suggest an alternative topcoat for a mechanical tin / zink plating? Most of the suppliers I have contacted about trivalent chromate have said they aren't recommending them for tin / zinc mixtures.

RE: Alternatives to hex chromate for mechanical tin / zink plating

Why do you want it topcoated?  What is the application?

RE: Alternatives to hex chromate for mechanical tin / zink plating

(OP)
Corrosion protection. I am hearing the trivalents aren't preforming as well for tin /zinc mixtures.

RE: Alternatives to hex chromate for mechanical tin / zink plating

If you want higher corrosion resistance, try using a higher performance zinc electroplating like ZinKlad or a zinc-nickel electroplating.  

RE: Alternatives to hex chromate for mechanical tin / zink plating

(OP)

Thank you for the reply. I do understand there are other options with electroplating. I was specifically wondering about mechanically plated parts.

The application I was thinking about was mechanically plated flat springs of extremely high tensile steel. They are not electroplated because of hydrogen embitterment / baking issues.

Cost is a bit of a factor, so exotic processes like solvent based aluminum plating are not viable.  

RE: Alternatives to hex chromate for mechanical tin / zink plating

The extra information supplied allows better responses. There are inorganic and organic topcoats that can improve corrosion resistance, try Magni and Dorken. If you want really good corrosion resistance with low embrittlement risk, try zinc-rich coatings from Magni and Dorken.  

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