Anodizing of AA6063 aluminium alloy profiles: Generation of dark appearance

被引：15
|
作者：
Ma, Y. [1 ]
Zhou, X. [1 ]
Thompson, G. E. [1 ]
Nilsson, J-O [2 ]
Gustavsson, M. [2 ]
Crispin, A. [2 ]
机构：
[1] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M13 9PL, Lancs, England
[2] Sapa Technol, SE-61281 Finspang, Sweden
来源：
SURFACE AND INTERFACE ANALYSIS | 2013年 / 45卷 / 10期
基金：
英国工程与自然科学研究理事会;
关键词：
AA6063 aluminum alloy; anodizing; dark appearance; precipitate; FILM; PRECIPITATION;
D O I：
10.1002/sia.5219
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The generation of dark appearance on an anodized AA6063-T6 aluminium alloy profile has been investigated. Plan and cross-sectional views of the anodic films of normal and dark samples revealed a distinct layer, of 1-2 mu m thickness, decorated with characteristic features in the outer film regions of the dark sample, contrasting with typical porous anodic film of the normal sample. Additionally, it was revealed that the alloy substrate of the dark sample was over-aged and the characteristic features in the outer film regions of the dark sample are related to preferential anodizing of coarsened (Mg2Si) precipitates. Further, it is suggested that the over-aged microstructure is not the sufficient condition for the occurrence of dark appearance, and the anodizing conditions in the early stages also play an important role in the generation of dark appearance. Copyright (c) 2013 John Wiley & Sons, Ltd.
引用
收藏
页码：1479 / 1484
页数：6
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