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topic 6717

Conductivity of the zinc plating with chromate conversion



We are using electrodeposited zinc coating on steel with additional chromate conversion. The process of this plating is performed according to the standard ASTM B633 [link by ed. to spec at TechStreet] type II. This standard does not specify if this coating (yellow chromate) is conductive ( electricity point of view). Since this finish will be used for grounding purposes. So I well appreciate to have some help regarding this issue.

Thank you in advance

Abdel Ahraiba
- Quebec - Canada


There are several grades/types of chromate ranging from clear to yellow, to bronze, to Olive Drab. In general, the biggest difference between these grades is the thickness of the chromate conversion coating (although bath recipes and procedures my differ as well); with clear cad being the thinnest and OD being the thickest.
The electrical conductivity varies as well with clear being the most conductive and OD being the least. Yellow cad is a middle of the road plating, offering a compromise between electrical conductivity and longer corrosion resistance.

Chris FitzSimons
- Lombard, Illinois

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