Effect of Mn2+ additive on the zinc phosphating of 2024-Al alloy

被引：40

作者：

Akhtar, A. S. ^{[1
]}

Wong, K. C. ^{[1
]}

Wong, P. C. ^{[1
]}

Mitchell, K. A. R. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada

来源：

THIN SOLID FILMS | 2007年 / 515卷 / 20-21期

基金：

加拿大自然科学与工程研究理事会;

关键词：

zinc phosphating; aluminum; conversion coatings; Mn2+ additive; X-ray photoelectron spectroscopy; scanning electron microscopy; auger electron; spectroscopy;

D O I：

10.1016/j.tsf.2007.03.058

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Zinc phosphate (ZPO) conversion coatings formed on 2024-T3 aluminum alloy, after dipping in Mn2+-containing ZPO coating baths for different times, have been studied by X-ray photoelectron spectroscopy, scanning electron microscopy, and scanning Auger microscopy. An optimal coating (in terms of thickness and morphology) is formed when the alloy is immersed for 3 min in a ZPO coating solution containing 2000 ppm Mn2+. Comparisons are made with coatings formed from a Ni2+-containing ZPO bath. Both Ni2+ and Mn2+ additives decrease the coating crystal size, with Mn2+ giving a greater reduction, and the coating formed from the Mn2+-containing solution is thicker than that formed with Ni2+. The coatings are heterogeneous in depth with Mn2+ depositing during the early stages of coating, while precipitation of Ni2+ occurs mainly later in the coating process. Patterns of deposition across the surface are also affected significantly by the composition of the ZPO coating solution. Mn2+ in the coating bath gives the most even distribution of coating across the different microstructural regions on the surface. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：7899 / 7905

页数：7

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