经济型铁素体不锈钢与耐候钢异种金属接头的耐蚀性能

中国腐蚀与防护学报

2012, Vol. 32

Issue (2): 115-122

研究报告

本期目录 | 过刊浏览

经济型铁素体不锈钢与耐候钢异种金属接头的耐蚀性能

张勇¹,覃作祥¹,许鸿吉¹,常凯¹,陆兴¹,佟维²

1. 大连交通大学材料科学与工程学院辽宁省轨道交通关键材料重点实验室大连 116028
2. 大连交通大学交通运输工程学院大连 116028

CORROSION RESISTANCE OF DISSIMILAR METAL JOINTS OF ECONOMIC FERRITIC STAINLESS STEEL AND WEATHERING STEEL

ZHANG Yong¹, QIN Zuoxiang¹, XU Hongji¹, CHANG Kai¹, LU Xing¹, TONG Wei²

1. Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028
2. School of Transport and Communication Engineering, Dalian Jiaotong University, Dalian 116028

全文: PDF(3892 KB)

摘要: 采用ER-309焊丝焊接了T4003与Q450NQR1耐候钢、Nirosta4003与Q450NQR1耐候钢两种异质接头，用金相方法分析了母材和接头的显微组织，通过盐雾腐蚀试验及电化学极化曲线测量对异种金属焊接接头的耐蚀性能进行了评价。结果表明，对T4003和Nirosta4003铁素体不锈钢同种金属所形成的焊接接头而言，焊缝的耐蚀性能均优于对应的母材，但热影响区的耐蚀性能变差。对T4003和Nirosta4003铁素体不锈钢与Q450NQR1耐候钢焊接形成的异质接头而言，焊缝的耐蚀性能下降。在盐雾状态下，同种金属焊接所形成的焊缝与母材的耐盐雾腐蚀性能水平相当，耐蚀性能较好；T4003和Nirosta4003不锈钢与Q450NQR1耐候钢焊接而成的异质接头腐蚀较为明显，尤其是耐候钢一侧的腐蚀较为严重，出现了大量的腐蚀坑。在异种金属所形成的焊接接头中，不锈钢母材、热影响区、焊缝以及耐候钢母材由于腐蚀电位差的不同形成原电池，致使耐候钢母材的腐蚀加剧。

关键词 ：铁素体不锈钢, 耐候钢, 异质接头, 腐蚀性能

Abstract：T4003 and Q450NQR1, as well as Nirosta 4003 and Q450NQR1 dissimilar metal joints were welded by ER-309 welding wire. The microstructure oftheir base metal and joint were analyzed by metallographic approach. The corrosion resistance of base metal and joints was evaluated by salt fog and electrochemical corrosion tests. The results demonstrated that as far as the similar metal joints of Nirosta 4003 and T4003 was concerned, the corrosion resistance of welding line was much better than that of base metal. However, the corrosion resistance of heat affected zone (HAZ) became worse. In the case of dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1, the corrosion resistance of welding line was reduced. Under salt spray condition, the corrosion resistance of welding line and base metal of similar metal joints was comparative. However, the dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1 exhibited obvious corrosion. Especially, abundant corrosion pits were found near the side of Q450NQR1. Due to the different corrosion voltages of stainless steel, weathering steel, HAZ, and welding line, a series of micro-batteries were formed in the dissimilar metal joints, which worsened the corrosion of weathering steel.

Key words： ferritic stainless steel weathering steel dissimilar metal joint corrosion resistance

收稿日期: 2011-09-23

ZTFLH:

TG174

基金资助:

铁道部计划项目(2008J007-C)资助

通讯作者: 覃作祥 E-mail: qinzx@djtu.edu.cn

Corresponding author: TONG Wei E-mail: qinzx@djtu.edu.cn

作者简介: 张勇，男，1976年生，博士，讲师，研究方向为纳米金属材料的制备与性能

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引用本文:

张勇,覃作祥,许鸿吉,常凯,陆兴,佟维. 经济型铁素体不锈钢与耐候钢异种金属接头的耐蚀性能[J]. 中国腐蚀与防护学报, 2012, 32(2): 115-122.
ZHANG Yong, YAN Zuo-Xiang, XU Hong-Ji, CHANG Kai, LU Xin, TONG Wei. CORROSION RESISTANCE OF DISSIMILAR METAL JOINTS OF ECONOMIC FERRITIC STAINLESS STEEL AND WEATHERING STEEL. J Chin Soc Corr Pro, 2012, 32(2): 115-122.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I2/115

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