As an auxiliary agent for anticorrosive liquid in place of hexavalent chromium

Hexavalent chromium has been used widely for many applications, including as a chromate treatment for zinc plating, a chemical conversion treatment for aluminum and magnesium, chrome plating process liquid and pigments for anticorrosive coating materials. However, it was pointed out long ago to have negative effects on the human body. These effects include carcinogenicity, toxicity (causing gastroenteritis and nephritis) when orally taken, and allergies and dermatitis triggered by skin contact.

Moreover, emissions of hexavalent chromium into discharged water and the atmosphere are strictly regulated.

Therefore, trivalent chromium plating is attracting attention due to the ease in which it can be used to treat wastewater and for its uniform electrodeposition properties.

Phosphorous acid and phosphites, which constitute trivalent chromium plating liquid, are expected to be further used as reducing agents.

Products available for this application
Phosphorous acid
Sodium phosphite

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