摘要
通过腐蚀质量损失分析,宏、微观腐蚀形貌观察及腐蚀产物分析等方法研究了T91钢在5.0%(质量分数)NaCl中性盐雾中的腐蚀行为。结果表明:在盐雾腐蚀过程的前75h,T91钢的腐蚀速率较低,表面腐蚀产物生长缓慢,75h后T91钢的腐蚀速率急剧增大,表面腐蚀产物快速增多增厚;T91钢表面的腐蚀产物主要为Fe和Cr的氧化物;T91钢表面首先产生局部腐蚀,进而发展成腐蚀斑,最后腐蚀斑底部产生新的局部腐蚀。
The corrosion behavior of T91 steel in neutral salt spray with 5%（mass）NaCl solution was studied by mass loss analysis,macro and micro morphology observation and corrosion product analysis.The results show that in the first 75 hof salt spray corrosion,the corrosion rate of T91 steel was low,and the surface corrosion products grew slowly;after 75 h,the corrosion rate of T91 steel sharply increased,and the surface corrosion products rapidly increased in quantity and thickness.The corrosion products on the T91 steel surface were mainly composed of oxides of Fe and Cr.The T91 steel surface first generated localized corrosion,and then the localized corrosion developed into corrosion pits.Finally,new localized corrosion occurred at the bottom of the corrosion pits.
作者
冯超
彭碧草
谢亿
王军
李明欢
刘永雄
吴堂清
尹付成
FENG Chao;PENG Bicao;XIE Yi;WANG Jun;LI Minghuan;LIU Yongxiong;WU Tangqing;YIN Fucheng(State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China;Hunan Xiangdian Boiler ＆ Pressure Vessel Test Center Co. , Ltd. , Changsha 410001, China;School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China)
出处
《腐蚀与防护》
CAS
北大核心
2018年第6期431-436,共6页
Corrosion & Protection
基金
国家自然科学基金项目(51601164)
中国博士后科学基金(2017M622594)
关键词
T91钢
中性盐雾试验
局部腐蚀
T91 steel
neutral salt spray test
localized corrosion
