Treating an autodeposited coating with an alkaline solution cont

Details Treating an autodeposited coating with an alkaline solution cont Treating an autodeposited coating with an alkaline solution cont

1991-06-21

1993-09-28

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

427352, 427353, 4273884, 4274431, 4274198, 106 1412, 106 1413, B05D 310

Patent

active

052485250

ABSTRACT:
The adhesion and/or corrosion resistance of a autodeposited coating can be improved by rinsing the uncured coating with an aqueous treatment solution that has a pH between 7 and 11 and contains between 0.05 and 5 w/o of anions derived from multifunctional organic acids, preferably anions of 1-hydroxyethylidene-1,1-diphosphonic acid, citric acid, tartaric acid, and/or oxalic acid. The method is particularly useful on leaf springs and other metallic objects with surfaces of high carbon and/or shot blasted steel, and is particularly useful in conjunction with an autodeposition bath containing internally stabilized poly {vinylidene chloride} latex, hydrofluoric acid, ferric fluoride, and hydrogen peroxide.

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