不同涂层处理的汽车紧固件用ST12冷轧钢与SS400热轧钢的电偶腐蚀行为研究

doi:10.11902/1005.4537.2013.258

中国腐蚀与防护学报

2015, Vol. 35

Issue (1): 86-90 DOI: 10.11902/1005.4537.2013.258

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不同涂层处理的汽车紧固件用ST12冷轧钢与SS400热轧钢的电偶腐蚀行为研究

赵晓宏¹, 郭泉忠², 杜克勤²(

), 郭兴华², 王勇²

1. 中国第一汽车股份有限公司技术中心长春 130000
2. 中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings

ZHAO Xiaohong¹, GUO Quanzhong², DU Keqin²(

), GUO Xinghua², WANG Yong²

1. China FAW Group Corporation R＆D Center, Changchun 130000, China
2. State Key Laboratory for Corrosion and Protection, Institution of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

采用极化曲线和电偶电位-时间曲线等方法,研究了在3.5%NaCl (质量分数) 溶液中,经无铬锌铝涂层以及电镀锌镍合金涂层处理后的ST12冷轧钢与SS400热轧钢偶接后的电偶腐蚀行为。结果表明:相比无铬锌铝涂层,经电镀锌镍处理的ST12/SS400电偶对电偶腐蚀反应的驱动力小,电偶电位更正,电偶电流密度更小,耐电偶腐蚀性能最好,而且,锌镍镀层自腐蚀速率低。因此,电镀锌镍涂层更适合替代纯Zn镀层,对汽车工业中紧固件进行表面处理。

关键词 ：电偶腐蚀, 无铬锌铝达克罗涂层, 电镀锌镍合金涂层, 极化曲线

Abstract：

Galvanic corrosion behavior of couples of cold rolled steel SS400 and hot rolled steel ST12 with chrome-free Zn/Al coating or Zn/Ni alloy electroplating was studied in 3.5%NaCl (mass fraction) solution by means of potentiodynamic polarization and galvanic method. The results showed that the couple of SS400 and ST12 with Zn/Ni alloy electroplating exhibited a weaker tendency of galvanic corrosion, a higher open circuit potential and a smaller galvanic current rather than that with chrome-free Zn/Al coating. While the free-corrosion current of Zn/Ni alloy electroplating coating was smaller than that of Zn/Al coating. Therefore, Zn/Ni alloy electroplating is extremely promising coating for the auto-mobile fastener to replace the traditional Zn electroplating.

Key words： galvanic corrosion chrome-free Zn/Al dacromet coating Zn/Ni alloy electroplating polarization curve

ZTFLH:

TG178

作者简介: null

赵晓宏，女，1972年生，高级工程师

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引用本文:

赵晓宏, 郭泉忠, 杜克勤, 郭兴华, 王勇. 不同涂层处理的汽车紧固件用ST12冷轧钢与SS400热轧钢的电偶腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(1): 86-90.
Xiaohong ZHAO, Quanzhong GUO, Keqin DU, Xinghua GUO, Yong WANG. Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 86-90.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.258 或 https://www.jcscp.org/CN/Y2015/V35/I1/86

图1 试样的表面形貌以及元素成分

图2 两种涂层在3.5%NaCl溶液中的动电位极化曲线

表1 动电位极化曲线的拟合结果

图3 涂覆不同涂层的ST12/SS400电偶对的电位随时间的变化曲线

图4 涂覆不同涂层的ST12/SS400电偶对的电偶电流随时间的变化曲线

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