Letter 22083

Chromate conversion coatings [Indonesia] 

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Can anyone help by giving informations about chromate conversion coating? I need information about the make up solution, the process and the maintenace, or maybe give me book reference on this topic.

Thanks,

Benny Lin
- Jakarta, Indonesia

Chromate conversion coating on aluminium is widely used worldwide and fairly simple process. It is also used over zinc and cadmium plating to enhance corrosion protection. One can use proprietary chemical and can we brought locally from any electroplating supplier and supplier can also provide method and control procedure.

There are various international standards also exist on some of them are as follows:

ASTM B449 [link is to spec at TechStreet] Standard specification for chromates on aluminium
MIL-DTL-81706A Chemical Conversion Materials for Coating Aluminium and Aluminium alloy
ASTM B201-80 [link is to spec at TechStreet] Testing Chromate Coating on Zinc and Cadmium Surface
AS 1791 Chromate conversion Coatings Zinc and Cadmium

Dr. Raj Pathya
- Melbourne, Australia

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