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| Sulfuric Acid Corrosion Resistance of Q345NS Steel Welded Joint |
SHI Jian( ), HU Xuewen, HE Bo, YANG Zheng, GUO Rui, WANG Fei |
| Technology Center of Masteel, Ma'anshan Iron and Steel Co. Ltd. , Ma'anshan 243000, China |
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Abstract The corrosion behavior of weld joints of Q345NS steel in sulfuric acid was studied via immersion test, and proper post characterization. The results show that due to the welding process, the element concentration difference between the base metal and the weld seam leads to that alloy elements such as Cr, Cu, Sb in the base metal diffuse towards and enrich in the weld seam. At the same time, the high temperature in the welding process will promote that process, resulting in the formation of a depletion zone of alloying elements on the side of the heat-affected zone near the base metal. The high temperature during the welding leads to the secondary allocation of Cu and Sb, and their content difference is further expanded. The large enrichment of Cu and Sb in the corrosion product scale can promote the densification of the corrosion product scale and improve the corrosion resistance to sulfuric acid for the weld Q345NS steel.
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Received: 13 October 2020
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Corresponding Authors:
SHI Jian
E-mail: stoneshi810@163.com
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About author: SHI Jian, E-mail: stoneshi810@163.com
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