The role of chromate treatment after phosphating in paint adhesion

被引：34

作者：

Maeda, S

Yamamoto, M

机构：

[1] Parker Ind Inc, Ohta Ku, Tokyo 146, Japan

[2] Nippon Steel Corp Ltd, Steel Res Labs, Chiba 293, Japan

来源：

PROGRESS IN ORGANIC COATINGS | 1998年 / 33卷 / 01期

关键词：

phosphating; chromate rinse; wet adhesion; surface structure;

D O I：

10.1016/S0300-9440(98)00014-9

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The surface composition of phosphated galvanized steel sheets with and without chromate post rinse has been studied in order to clarify the effect of chromate treatment on wet adhesion. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses disclosed that an incomplete phosphate layer composed of dihydrate phosphate and ferric compounds (Fe2O3 and FePO4) was present on the surface of hopeite coatings on an as-phosphated sheet. Chromate post treatment remarkably improved the wet adhesion of full-painted sheets by: (1) removal of the incomplete layer which may dissolve during cathodic electrodeposition and (2) formation of a CrOOH compound strongly bonded to the resin due to its hydrogen bond. Published by Elsevier Science S.A.

引用

页码：83 / 89

页数：7

共 15 条

[1] STUDY OF HOPEITE COATINGS .1. PURE HOPEITE THERMAL DEHYDRATION - DIHYDRATE, ZN3(PO4)2.2H2O, STRUCTURE CONFORMATION [J].