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
收藏
页码：7899 / 7905
页数：7
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