WASHING METHOD IN ELECTRODEPOSITION COATING
PROBLEM TO BE SOLVED: To provide a washing method by which washing effect can be increased without increasing the concentration of solid contents in washing water and without specially adding a solvent thereto, particularly, in one coat electrodeposition coating. SOLUTION: In a washing stage where t...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a washing method by which washing effect can be increased without increasing the concentration of solid contents in washing water and without specially adding a solvent thereto, particularly, in one coat electrodeposition coating. SOLUTION: In a washing stage where the material to be one-coated subjected to electrodeposition coating is washed, a nonionic surfactant in which HLB is 10 to 16, and a hydrophilic group is a polyethylene oxide adduct having high molecular weight is contained at the concentration of 50 to 200 ppm in a washing bath solution. The nonionic surfactant is obtained by adding ethylene oxide of 2 to 80 mol to alcohol or nonyl phenol. In the electrodeposition coating, a dull anionic electrodeposition coating material containing a metallic chelate compound is coated. |
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