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What is the difference between trivalent chromates and hexavalent chromates?

April 26, 2017chromates difference hexavalent trivalent

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What is the difference between trivalent chromates and hexavalent chromates?

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Hexavalent chromates were once the most commonly used chromate throughout various industries. Today metal finishing processes are moving towards trivalent chromates to meet European Union initiatives End of Life of Vehicle (ELV) and RoHS. The usage of hexavalent chromates has been limited, resulting in trivalent chromates now being used more predominantly. Trivalent chromates produce a harder, scratch-resistant coating with lower water content providing more heat resistance.