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AQUEOUS ACIDIC COMPOSITION FOR FORMING CHROMIUM-CONTAINING CHEMICAL CONVERSION COATING ON IRON-BASED MEMBER, AND IRON-BASED MEMBER HAVING CHEMICAL CONVERSION COATING FORMED USING THE COMPOSITION
AQUEOUS ACIDIC COMPOSITION FOR FORMING CHROMIUM-CONTAINING CHEMICAL CONVERSION COATING ON IRON-BASED MEMBER, AND IRON-BASED MEMBER HAVING CHEMICAL CONVERSION COATING FORMED USING THE COMPOSITION
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机译：在铁基构件上形成含铬化学转化膜的水酸组合物，以及使用该组合物制成的化学转化膜的铁基构件
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摘要
An aqueous acidic composition is provided for forming a chromium-containing chemical conversion coating on a member having an iron-based metal surface. The composition contains a water-soluble trivalent chromium-containing substance, a water-soluble zinc-containing substance, and a water-soluble polyvalent carboxylic acid compound. On the total composition basis, the water-soluble trivalent chromium-containing substance has a content of 60 mmol/L or more in terms of chromium, the water-soluble zinc-containing substance has a molar content in terms of zinc such that a ratio of the content is 0.6 or more to a molar content in terms of chromium of the water-soluble trivalent chromium-containing substance, and the water-soluble polyvalent carboxylic acid compound has a content of 55 mmol/L or more in terms of polyvalent carboxylic acid. The composition is free from allylamine, polyallylamine, aromatic sulphonic acid, aromatic sulphonic acid-formaldehyde condensate, and derivatives thereof, and fluorine-based substance, hexavalent chromium-containing substance, and film-forming organic component.
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