CCSA和Q235B钢在长江淡水环境中腐蚀行为研究  

Corrosion Behavior of Two Steels CCSA and Q235B in Changjiang Freshwater Surroundings

作　　者：张照易 周学杰 陈昊 吴军 陈志飈 陈志坚 ZHANG Zhaoyi;ZHOU Xuejie;CHEN Hao;WU Jun;CHEN Zhibiao;CHEN Zhijian(China Academy of Machinery Wuhan Research Institute of Materials Protection Co.,Ltd.,Wuhan 430030,China;Wuhan Materials Corrosion National Observation and Research Station,Wuhan 430030,China;Wuhan Institute of Specification of China Classification Society,Wuhan 430030,China)

机构地区：[1]中国机械总院集团武汉材料保护研究所有限公司,武汉430030 [2]湖北武汉大气淡水环境材料腐蚀国家野外科学观测研究站,武汉430030 [3]中国船级社武汉规范研究所,武汉430030

出　　处：《中国腐蚀与防护学报》2024年第3期735-744,共10页Journal of Chinese Society For Corrosion and Protection

摘　　要：利用形貌分析、腐蚀失重、X射线衍射仪(XRD)、电化学方法开展对CCSA和Q235B两种船用钢板材料在长江淡水环境中不同区域(大气区、水线区、水下区)暴露0.5、1、2、3、4和7 a腐蚀行为的研究。结果表明,两种碳钢在长江淡水环境发生明显腐蚀,且腐蚀形貌十分相似,腐蚀发展均遵循幂函数规律;在大气区、水线区和水下区,第7 a CCSA的腐蚀率分别为8、77和40μm·a^(-1),Q235B的腐蚀率分别为9、80和41μm·a^(-1),在水线区腐蚀最为严重。腐蚀产物成分中除泥沙外,主要包含α-FeOOH、γ-FeOOH、Fe_(2)O_(3)和Fe_(3)O_(4)/γ-Fe_(2)O_(3)。综合电化学分析结果,CCSA较Q235B具有更好的耐蚀性,长江淡水环境不同区域对碳钢腐蚀快慢程度由大到小排序为:水线区>水下区>大气区。There is limited studies available on the corrosion of carbon steel in freshwater surroundings.Herewith,plates of two ship steels CCSA and Q235B steel were exposed to different sites such as the atmosphere,waterline,and underwater in freshwater surroundings of the Changjiang River(Yangtze River)for 0.5,1,2,3,4,and 7 a,then there corrosion behavior was assessed by means of morphology analysis,mass-loss measurement,XRD,and electrochemical techniques.Results show that the two carbon steels suffered from significant corrosion in the freshwater surroundings of the Changjiang River,exhibiting nearly the identical corrosion morphology.Their corrosion processes follow a power function law.After 7 years,the corrosion rates of CCSA were found to be 8,77 and 40μm·a^(-1) in the atmosphere,waterline,and underwater,respectively,while the corrosion rates of Q235B were 9,80,and 41μm·a^(-1) in the same conditions.Among others,the corrosion on the waterline was the highest.The composition of the corrosion product of the two carbon steels was similar,primarily including SiO2,α-FeOOH,γ-FeOOH,Fe_(2)O_(3)and Fe_(3)O_(4)/γ-Fe_(2)O_(3).Based on the comprehensive electrochemical analysis results,CCSA demonstrated better corrosion resistance than Q235B.Regarding to the test results in various test sites of freshwater surroundings of the Changjiang River,the corrosion rate of the carbon steels may be ranked in descending order as follows:waterline>underwater>atmospheric.

关 键 词：CCSA Q235B 长江淡水环境 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]