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

J Chin Soc Corr Pro

2012, Vol. 32

Issue (2): 115-122 DOI:

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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

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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

Received: 23 September 2011

ZTFLH:

TG174

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

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Cite this article:

ZHANG Yong, QIN Zuoxiang, XU Hongji, CHANG Kai, LU Xing, 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.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I2/115

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