0.1%NaHSO_3盐雾条件下T91钢的腐蚀行为  

Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO_3 Solution

作　　者：冯超 彭碧草 谢亿 王军[1,2] 李明欢 吴堂清 尹付成 

机构地区：[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验中心有限公司,长沙410007 [3]湘潭大学材料科学与工程学院,湘潭411105

出　　处：《中国腐蚀与防护学报》2017年第6期583-589,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51601164);中国博士后科学基金(2017M622954)~~

摘　　要：在NaHSO_3溶液中进行盐雾实验,利用腐蚀失重、宏观形貌和微观形貌观察等方法研究了T91钢盐雾腐蚀过程中的腐蚀行为。结果表明,在100 h盐雾腐蚀过程中,T91钢腐蚀产物逐步增加,其覆盖比例、完整度和致密性都逐渐提高,并最终覆盖样品表面。腐蚀产物的主要成分为FeOOH、Fe_2O_3·3H_2O和Cr_2O_3,并含有少量硫化物。T91钢腐蚀过程可以表述为:样品表面先产生了零星的局部腐蚀,而后局部腐蚀逐渐长大并相互连接形成大腐蚀坑,大腐蚀坑逐步发展形成更大范围的腐蚀。Corrosion behavior of T91 steel by neutral salt spray with 0.1%（mass fraction） NaHSO3 was studied by means of mass loss measurement,macro-appearances observation and characterization of corrosion products with scanning electron microscope/energy dispersive spectrometer（SEM/EDS）.Results showed the corrosion product on the steel surface increases gradually throughout the salt spray testing,and its coverage ratio,integrity and compactness increase accordingly,and finally the corrosion product completely covers the steel surface.The corrosion product composed mainly of FeOOH,Fe2O3·3 H2O and Cr2O3 containing a little sulfur.The corrosion process of T91 steel by salt spray test can be expressed as follows： during the salt spray with NaHSO3 solution,localized corrosion sporadically generates on the steel surface at the initial stage,and then these localized corrosion develops into big corrosion spots,and finally those big corrosion spots spread and connected each other to generate corrosion on large area.

关 键 词：T91钢 盐雾实验 扫描电镜 局部腐蚀 

分 类 号：TG172.4[金属学及工艺—金属表面处理]