Xiaoqian Liu, Tieming Guo, Wan Zhang, Weihong Wu, Xueli Nan, Yanwen Hu, Xiangbin Yi
{"title":"通过循环浸泡+红外烘干法研究 Q420qNH 板和焊接接头在除冰盐介质中的腐蚀行为","authors":"Xiaoqian Liu, Tieming Guo, Wan Zhang, Weihong Wu, Xueli Nan, Yanwen Hu, Xiangbin Yi","doi":"10.5006/4513","DOIUrl":null,"url":null,"abstract":"\n The corrosion behavior of Q420qNH steel plate and welded joint in deicing salt medium is investigated by cyclic immersion + infrared drying accelerated corrosion experiments. The results show that the corrosion products are mainly Fe2O3 and FeOCl under the influence of Cl- concentration differential corrosion microcells in the immersion corrosion anoxic stage, and the corrosion products are mainly β-FeOOH, γ-FeOOH, and Fe3O4 under the influence of oxygen concentration differential corrosion microcells catalyzed in the infrared drying stage. Throughout the corrosion process, the corrosion weight gain and average corrosion rate of the welded sample is always lower than that of the plate sample. The Iα-FeooH/Iβ-FeooH + FeOCl peak intensity ratio of the welded sample is always higher than that of the plate sample and the heat- affected zone sample. The corrosion types of the three samples are inhomogeneous total corrosion + pitting, and the depth of the pits in the plate is much larger than that in the weld and the heat-affected zone. In the late stage of corrosion, the self-corrosion current density is: plate > heat-affected zone > weld, and the resistance of the rust layer of the weld and heat-affected zone samples is 1.66 times and 1.31 times of that of the plate sample, respectively. This is because the microstructure of the weld and heat-affected zone are composed of a large number of fine acicular ferrite and lath-shaped bainite generated inside the original austenite grains, and the small angle grain boundary is not conducive to the initiation and expansion of pitting corrosion. In addition, the higher content of Cu, Cr, Ni and other elements in the weld can refine the rust layer products and effectively impede the intrusion of Cl-, contributing to the improvement of corrosion resistance. As the combined effect of Cl- and immersion anoxic environment inhibits the formation of α-FeOOH and promotes the formation of the large number of loose and unstable β-FeOOH and soluble FeOCl, the weathering steel is not well protected by the rust layer during cyclic immersion corrosion in deicing salt medium.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Corrosion behavior of Q420qNH plate and welded joint in deicing salt medium by cyclic immersion + infrared drying\",\"authors\":\"Xiaoqian Liu, Tieming Guo, Wan Zhang, Weihong Wu, Xueli Nan, Yanwen Hu, Xiangbin Yi\",\"doi\":\"10.5006/4513\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n The corrosion behavior of Q420qNH steel plate and welded joint in deicing salt medium is investigated by cyclic immersion + infrared drying accelerated corrosion experiments. The results show that the corrosion products are mainly Fe2O3 and FeOCl under the influence of Cl- concentration differential corrosion microcells in the immersion corrosion anoxic stage, and the corrosion products are mainly β-FeOOH, γ-FeOOH, and Fe3O4 under the influence of oxygen concentration differential corrosion microcells catalyzed in the infrared drying stage. Throughout the corrosion process, the corrosion weight gain and average corrosion rate of the welded sample is always lower than that of the plate sample. The Iα-FeooH/Iβ-FeooH + FeOCl peak intensity ratio of the welded sample is always higher than that of the plate sample and the heat- affected zone sample. The corrosion types of the three samples are inhomogeneous total corrosion + pitting, and the depth of the pits in the plate is much larger than that in the weld and the heat-affected zone. In the late stage of corrosion, the self-corrosion current density is: plate > heat-affected zone > weld, and the resistance of the rust layer of the weld and heat-affected zone samples is 1.66 times and 1.31 times of that of the plate sample, respectively. This is because the microstructure of the weld and heat-affected zone are composed of a large number of fine acicular ferrite and lath-shaped bainite generated inside the original austenite grains, and the small angle grain boundary is not conducive to the initiation and expansion of pitting corrosion. In addition, the higher content of Cu, Cr, Ni and other elements in the weld can refine the rust layer products and effectively impede the intrusion of Cl-, contributing to the improvement of corrosion resistance. As the combined effect of Cl- and immersion anoxic environment inhibits the formation of α-FeOOH and promotes the formation of the large number of loose and unstable β-FeOOH and soluble FeOCl, the weathering steel is not well protected by the rust layer during cyclic immersion corrosion in deicing salt medium.\",\"PeriodicalId\":10717,\"journal\":{\"name\":\"Corrosion\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2024-05-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Corrosion\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.5006/4513\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.5006/4513","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Corrosion behavior of Q420qNH plate and welded joint in deicing salt medium by cyclic immersion + infrared drying
The corrosion behavior of Q420qNH steel plate and welded joint in deicing salt medium is investigated by cyclic immersion + infrared drying accelerated corrosion experiments. The results show that the corrosion products are mainly Fe2O3 and FeOCl under the influence of Cl- concentration differential corrosion microcells in the immersion corrosion anoxic stage, and the corrosion products are mainly β-FeOOH, γ-FeOOH, and Fe3O4 under the influence of oxygen concentration differential corrosion microcells catalyzed in the infrared drying stage. Throughout the corrosion process, the corrosion weight gain and average corrosion rate of the welded sample is always lower than that of the plate sample. The Iα-FeooH/Iβ-FeooH + FeOCl peak intensity ratio of the welded sample is always higher than that of the plate sample and the heat- affected zone sample. The corrosion types of the three samples are inhomogeneous total corrosion + pitting, and the depth of the pits in the plate is much larger than that in the weld and the heat-affected zone. In the late stage of corrosion, the self-corrosion current density is: plate > heat-affected zone > weld, and the resistance of the rust layer of the weld and heat-affected zone samples is 1.66 times and 1.31 times of that of the plate sample, respectively. This is because the microstructure of the weld and heat-affected zone are composed of a large number of fine acicular ferrite and lath-shaped bainite generated inside the original austenite grains, and the small angle grain boundary is not conducive to the initiation and expansion of pitting corrosion. In addition, the higher content of Cu, Cr, Ni and other elements in the weld can refine the rust layer products and effectively impede the intrusion of Cl-, contributing to the improvement of corrosion resistance. As the combined effect of Cl- and immersion anoxic environment inhibits the formation of α-FeOOH and promotes the formation of the large number of loose and unstable β-FeOOH and soluble FeOCl, the weathering steel is not well protected by the rust layer during cyclic immersion corrosion in deicing salt medium.
期刊介绍:
CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion.
70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities.
Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives:
• Contribute awareness of corrosion phenomena,
• Advance understanding of fundamental process, and/or
• Further the knowledge of techniques and practices used to reduce corrosion.