Methods for treating a ferrous metal substrate (English)

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Disclosed are methods for treating and coating a ferrous metal substrate, such as cold rolled steel, hot rolled steel, and electrogalvanized steel. These methods include contacting the ferrous metal substrate with an aqueous pretreatment composition comprising: (a) a Group IIIB and/or IVB metal compound; (b) phosphate ions; and (c) water. Also disclosed are off-shift methods of removing iron from the pretreatment bath.

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    Methods for treating a ferrous metal substrate
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    Europäisches Patentamt
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    Electronic Resource
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    IPC:    C02F Behandlung von Wasser, Schmutzwasser, Abwasser oder von Abwasserschlamm, TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE / C23C Beschichten metallischer Werkstoffe, COATING METALLIC MATERIAL
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