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Chromate Conversion Coatings

Will a trivalent chromate conversion coating with a chromium total of 56,000 mg/L out perform (salt spray) a trivalent chromate conversion coating with a chromium total of 28,000 mg/L. There is no hex chrome in either product.

Don Penzenik
- Elkhart, Indiana
2003

2003

There is no correlation between solution concentration and salt spray resistance when comparing different products. Each product is formulated to work best within a certain concentration range, and possibly, the more dilute product works more efficiently. At the very least, it should reduce wastewater treatment. If this is for treating aluminum, do either of these products pass the testing requirements of MIL-DTL-81706 [on DLA] (appear on QPL-81706 [on DLA] )?

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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