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topic 46537

Is there a standard zinc dichromate coating repair procedure?


We are currently using a zinc dichromate coating on a mild steel tube per ASTM-A513, Grade 1010, but suffering from customer complaints of cosmetic issues from installation.

Zinc dichromate plating per ASTM B633 [link by ed. to spec at TechStreet] FE/ZN 12, service condition SC3.

Is there a standard that can be applied in the repair of localized areas of the coating, to attain the original intended protection of the base material?

At the moment, we are having to field replace entire members due to this issue.

William Goodson
Product Designer - Minneapolis, Minnesota, USA


Mr. Goodson,

I am not aware of any standard. Nevertheless, you can apply brush plating to the area needed; only if it is clear (blue) chromate. Yet would look somehow like a patch. If it is only a cosmetic problem and is only in some localized areas, you can apply the brush plating to give the corrosion protection and then add some powder metallic paint that would disguise the patch. The extreme case would be removing the pipe and get it plated again.


Guillermo Castorena G.
Jobshop - San Luis Potosí, México


Sometimes you can apply a chromate touch up, but most of the time it will be a little ugly to really ugly.
Normally, a brush plate repair will be ugly!

James Watts
- Navarre, Florida

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