AA6063铝合金Zr黑灰色转化膜及其自修复性能

doi:10.11902/1005.4537.2013.217

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 177-182 DOI: 10.11902/1005.4537.2013.217

本期目录 | 过刊浏览

AA6063铝合金Zr黑灰色转化膜及其自修复性能

陈廷益^1,²(

), 路文¹, 李文芳², 付业琦¹

1. 贵州师范大学材料与建筑工程学院无机非金属功能材料重点实验室贵阳 550001
2. 华南理工大学材料科学与工程学院广州 510640

Preparation and Performace of a Black-grey Coating on AA6063 Aluminium Alloy

CHEN Tingyi^1,²(

), LU Wen¹, LI Wenfang², FU Yeqi¹

1. School of Materials and Construction, Guizhou Normal University, Guiyang 550001, China
2. School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China

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摘要:

在常温下实现了6063铝合金的无铬化学转化处理,处理液无需另外添加氧化剂而性能稳定,3 min内快速成膜,转化膜为黑灰色,解决了Zr转化膜的着色问题。通过SEM,XRD,XPS及电化学工作站分析表征锆转化膜。结果表明,膜层由Al,Al₂O₃,AlF₃,KZrF₃(OH)₂H₂O及KZrF₃O2H₂O组成,Zr转化膜耐腐蚀性能比铝合金提高了两个数量级；膜层具有双层结构,结构电路为R1+R2+C2/R2+M3。通过外加电源破坏该转化膜,发现Zr转化膜在自然环境及NaCl溶液中可进行自我修复。

关键词 ：着色, 自修复, 锆转化膜, 6063铝合金

Abstract：

A chemical conversion coating on 6063 aluminum alloy was prepared with a Cr-free solution without addition of any extra oxidants at ambient temperature, with which a dark-gray Zr-containing conversion film could be obtained. Then the film was characterized by means of SEM, XRD, XPS and electrochemical workstation. It follows that the film is made up of Al, Al₂O₃, AlF₃, KZrF₃(OH)₂H₂O and KZrF₃O2H₂O. The conversion film coated aluminum alloy exhibits corrosion resistance of two orders of magnitude higher than the bare alloy. The film has a double layered structure, which may be described as a circuit with R1+R2+C2/R2+M3. The conversion film shows certain re-healing ability in natural environment and NaCl solution after the film was artificially damaged.

Key words： coloring re-healing zirconium porous film aluminum alloy 6063

收稿日期: 2013-12-02

ZTFLH:

TN383

基金资助:贵州省科学技术基金项目 ([2013]2206),贵州省国际科技合作计划项目 ([2013]7017),贵阳市白云区科技计划项目 ([2013]),贵州省科技计划项目 ([2012]3013) 和贵州师范大学博士科研启动金项目资助

作者简介: null

陈廷益，男，1979年生，博士

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引用本文:

陈廷益, 路文, 李文芳, 付业琦. AA6063铝合金Zr黑灰色转化膜及其自修复性能[J]. 中国腐蚀与防护学报, 2015, 35(2): 177-182.
Tingyi CHEN, Wen LU, Wenfang LI, Yeqi FU. Preparation and Performace of a Black-grey Coating on AA6063 Aluminium Alloy. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 177-182.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.217 或 https://www.jcscp.org/CN/Y2015/V35/I2/177

图1 Zr转化膜试样普通光学照片

图2 Zr转化膜表面及人为断裂区附近的SEM像

图3 Zr转化膜的EDS结果

表1 EDS结果对应的元素含量

图4 铝合金转化膜的XRD谱

图5 铝合金转化膜的XPS谱

图6 铝合金及转化膜的电化学极化曲线

表2 从图6中极化曲线得出的耐蚀性电化学参数

图7 Zr转化膜的电化学阻抗曲线及其拟合结果

图8 Zr转化膜的外加电压及电流曲线

图9 Zr转化膜受破坏及自修复后的电化学阻抗曲线

图10 Zr转化膜试样在3.5%NaCl溶液中的开路电压

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