S450EW焊接接头在NaHSO<sub>3</sub>溶液中的腐蚀行为研究

doi:10.11902/1005.4537.2016.178

中国腐蚀与防护学报

2017, Vol. 37

Issue (6): 575-582 DOI: 10.11902/1005.4537.2016.178

研究报告

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S450EW焊接接头在NaHSO₃溶液中的腐蚀行为研究

王军¹, 冯超^1,², 彭碧草^1,², 谢亿^1,², 张明华³, 吴堂清³(

)

1 国网湖南电力公司电力科学研究院长沙 410007
2 湖南省湘电锅炉压力容器检测中心有限公司长沙 410007
3 湘潭大学材料科学与工程学院湘潭 411105

Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO₃ Solution

Jun WANG¹, Chao FENG^1,², Bicao PENG^1,², Yi XIE^1,², Minghua ZHANG³, Tangqing WU³(

)

1 State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China
2 Hunan Xiangdian Boiler & Pressure Vessel Test Center Ltd., Changsha 410007, China;
3 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China

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摘要:

采用熔化极富氩气体保护焊进行S450EW同种金属焊接,并利用电化学测试研究了焊接接头不同区域的耐蚀性能。结果表明,S450EW焊接接头母材区和焊缝区显微组织均为粒状贝氏体,热影响区为铁素体和珠光体的混合组织。焊缝区主要发生均匀腐蚀,但母材区和热影响区以局部腐蚀为主,而且热影响区腐蚀程度更深。焊丝中较高的Ni含量使得焊缝区抗大气腐蚀性能较好,而热影响区铁素体和珠光体两相组织导致其腐蚀速率较高。

关键词 ： S450EW钢, 焊接接头, 大气腐蚀, 电化学阻抗谱

Abstract：

The weld joint of S450EW steel was prepared by metal active gas arc (MAG) welding. The corrosion behavior of different zones of the welded joint was studied via electrochemical test and scanning electron microscope (SEM). The results showed that the microstructures were mainly composed of granular bainite of the base metal zone and weld zone, while the microstructure of the heat affected zone was composed of a mixture of ferrite and pearlite. Uniform corrosion was the typical corrosion pattern in the weld zone, and local corrosion occurred in the base metal zone and heat affected zone. Besides, severer local corrosion was observed in the heat affected zone. The better corrosion resistance of the weld zone may ascribed to the effect of high Ni content of the welding rod, while the high corrosion rate of the heat affected zone may be due to the dual phase microstructure of ferrite and pearlite.

Key words： S450EW steel welded joint atmospheric corrosion electrochemical impedance spectroscopy

收稿日期: 2016-09-19

ZTFLH:

TG172.4

基金资助:国家自然科学基金 (51601164和51471176) 及中国博士后科学基金 (2017M622594)

作者简介:

作者简介王军,男,1984年生,博士

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引用本文:

王军, 冯超, 彭碧草, 谢亿, 张明华, 吴堂清. S450EW焊接接头在NaHSO₃溶液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2017, 37(6): 575-582.
Jun WANG, Chao FENG, Bicao PENG, Yi XIE, Minghua ZHANG, Tangqing WU. Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO₃ Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 575-582.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.178 或 https://www.jcscp.org/CN/Y2017/V37/I6/575

表1 S450EW钢和TH650EW-II焊丝的化学成分

图1 焊接顺序图

图2 S450EW焊接接头的金相组织照片

图3 母材区在0.01 mol/L NaHSO3溶液中浸泡12 d后的表面形貌

图4 热影响区在0.01 mol/L NaHSO3溶液中浸泡12 d后的表面形貌

图5 焊缝区在0.01 mol/L NaHSO3溶液中浸泡12 d后的表面形貌

图6 母材区在0.01 mol/L NaHSO3溶液中浸泡12 d并去除腐蚀产物层后的表面形貌

图7 热影响区在0.01 mol/L NaHSO3溶液中浸泡12 d并去除腐蚀产物层后的表面形貌

图8 焊缝区在0.01 mol/L NaHSO3溶液中浸泡12 d并去除腐蚀产物层后的表面形貌

图9 焊接接头不同区域开路电位随时间演化曲线

图10 焊接接头不同区域线性极化电阻随时间演化曲线

图11 浸泡12 d后焊接接头不同区域的Tafel极化曲线

表2 焊接接头不同区域的Tafel极化曲线拟合结果

图12 焊接接头不同区域的电化学阻抗谱随时间演化曲线

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