不同表面防护处理的6016铝合金/DC01碳钢电偶腐蚀行为研究

doi:10.11902/1005.4537.2021.048

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 281-287 DOI: 10.11902/1005.4537.2021.048

研究报告

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不同表面防护处理的6016铝合金/DC01碳钢电偶腐蚀行为研究

蔡建敏¹, 关蕾¹(

), 李雨²

^1.广东工业大学省部共建精密电子制造技术与装备国家重点实验室广州市非传统制造技术及装备重点实验室广州 510006
^2.广东省工业分析检测中心广州 510651

Effect of Surface Treatment on Galvanic Corrosion of 6061 Al-alloy and DC01 Carbon Steel

CAI Jianmin¹, GUAN Lei¹(

), LI Yu²

^1.Guangzhou Key Laboratory of Nontraditional Machining and Equipment, State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
^2.Guangdong Industrial Analysis and Testing Center, Guangdong Academy of Science, Guangzhou 510651, China

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摘要:

为探究车用钢铝电偶腐蚀的表面防护工艺效果，分别对车用6016铝合金和DC01碳钢进行钛锆转化和热镀锌处理，采用极化测试、电化学噪声技术和扫描电镜分析不同表面处理的电偶腐蚀速率及腐蚀形态。结果表明：未处理的6016铝合金与DC01碳钢之间存在显著的电偶腐蚀，铝合金作为阳极，偶接24 h就表现出全面腐蚀；仅对铝合金钛锆转化处理，铝合金仍作为阳极，其腐蚀形态以点蚀为主，电偶电流略微降低，防护效果不明显；仅对碳钢镀锌处理，发生极性反转，铝合金转变为阴极受到保护，但铝合金表面富铁夹杂诱发了点蚀坑的形成；对铝合金钛锆转化处理的同时对钢镀锌，电偶电流降低两个数量级，电偶腐蚀防护效果显著。

关键词 ：轻量化, 表面处理, 电偶腐蚀

Abstract：

Surface treatments of titanium-zirconium conversion and hot-dip galvanization were applied on 6016 Al-alloy and DC01 carbon steel, respectively. Then the galvanic corrosion behavior in 5% NaCl solution for the couple of 6016 Al-alloy and DC01 carbon steel without and with pre-surface treatment was comparatively studied by means of polarization measurement , electrochemical noise measurement and scanning electron microscope (SEM). The results showed that the galvanic corrosion between the bare 6016 Al-alloy and bare DC01 carbon steel was severe. The merely titanium-zirconium conversion treatment on 6016 Al-alloy cannot solve the problem of galvanic corrosion of the couple of the surface treated 6016 Al-alloy with bare DC01 carbon steel, while the treated 6016 Al-alloy suffered from pitting corrosion. However, for the couple of bare 6016 Al-alloy and the galvanized steel, the former one could become a cathode, which can be protected by the galvanized steel, whereas, the iron-rich inclusions on 6016 Al-alloy surface induced the formation of pits. However, the galvanic current can be reduced by two orders for the couple of the galvanized DC01 steel and the titanium-zirconium conversion treated 6016 Al-alloy.

Key words： light weight surface treatment galvanic corrosion

收稿日期: 2021-03-10

ZTFLH:

TG174

基金资助:国家自然科学基金(52001074);广东省自然科学基金(2021A1515010967);广州市科技计划项目(202102020723);中国博士后科学基金(2020M682929)

通讯作者: 关蕾 E-mail: lguan@gdut.edu.cn

Corresponding author: GUAN Lei E-mail: lguan@gdut.edu.cn

作者简介: 蔡建敏，男，1995年，硕士生

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引用本文:

蔡建敏, 关蕾, 李雨. 不同表面防护处理的6016铝合金/DC01碳钢电偶腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(2): 281-287.
Jianmin CAI, Lei GUAN, Yu LI. Effect of Surface Treatment on Galvanic Corrosion of 6061 Al-alloy and DC01 Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 281-287.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.048 或 https://www.jcscp.org/CN/Y2022/V42/I2/281

图1 6016铝合金经钛锆转化处理和DC01钢热镀锌后的形貌

图2 6016铝合金和DC01钢表面处理前后的极化曲线

表1 极化曲线拟合结果

图3 6016铝合金 /DC01钢电偶对的电偶电流随时间变化曲线

图4 6016铝合金与DC01钢发生电偶腐蚀和自腐蚀24 h后腐蚀形貌及其金属间化合物EDS分析

图5 钛锆转化铝合金/DC01钢电偶对的电偶电流随时间变化曲线

图6 钛锆转化铝合金与DC01钢偶接24 h后的腐蚀形貌

图7 6016铝合金/镀锌钢电偶对的电偶电流随时间变化曲线

图8 6016铝合金/镀锌钢电偶对24 h后腐蚀形貌

图9 钛锆转化铝合金/镀锌钢电偶对的电偶电流随时间变化曲线

图10 钛锆转化铝合金/镀锌钢电偶对24 h后腐蚀形貌

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