Nippon Paint Compnay, Ltd.

Naohiko Sumie

Tamotsu Sobata

A process for coating a metallic molding article comprising transporting said article by conveyer means continuously and serially through a degreasing stage (1), a first water rinsing stage (2), a surface conditioning stage (3), a chemical conversion treatment stage (4), a second water rinsing stage (5), and an electrodeposition coating stage (6), wherein at least one stage of said stage (1), (2), (3), (4), (5) comprises in dipping said article in a treating bath of dipping system, at least one unit of said treating bath is provided with a vibratory agitation means, and the angles of immersion and emergence of said article with respect to said bath are not less than 25 degrees. The invention contributes to a curtailment of pre-treatment before coating and an effective elimination of adherent metal particles from the matallic article to provide a very satisfactory coating film.

Process for coating metallic molding articles

An alkaline degreasing aqueous solution containing 0.01 to 10 g/l of a nonionic surface-active agent, and an organic substance exhibiting water solubility or water dispersibility at a pH value of at least 8, having a phenolic hydroxyl group with a molecular weight of at least 500, at a weight ratio of 0.1 to 2:1=(organic substance having a phenolic hydroxyl group):(nonionic surface-active agent). The alkaline degreasing aqueous solution has a pH value of at least 8.

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Kobe, Japan

Naohiko Sumie