超临界水冷壁管材T23在弱碱性S^(2-)溶液中的腐蚀行为  

Corrosion Behavior of T23 Material Used for Supercritical Water-Wall Tubes in Alkalescent S^(2-)Solutions

作　　者：余菲[1,2] 李宇春[1,2] 蒋娅[1,2] 喻小伟[1,2] 

机构地区：[1]长沙理工大学化学与生物工程学院,长沙410114 [2]电力与交通材料重点实验室,长沙410114

出　　处：《腐蚀与防护》2011年第4期265-268,共4页Corrosion & Protection

基　　金：长沙理工大学电力与交通材料保护湖南省重点实验室开放基金资助项目

摘　　要：采用挂片试验、电化学工作站、金相显微镜、X射线衍射仪等研究了在不同pH、温度及S^(2-)浓度条件下,T23材料的电化学腐蚀行为及腐蚀产物的特点。根据试验结果分析认为:在温度范围10～70℃条件下,T23的腐蚀程度随着温度的升高加剧,弱碱溶液中S^(2-)对材料表面侵蚀,破坏了OH^-的抑制作用;pH=9,t=70℃,0.1mol/L S^(2-)溶液中,试片表面形成了Fe_2(SO_4)_3或Fe_2(SO_3)_3物质,出现了较大的腐蚀坑,而空白溶液浸泡过的试片表面存在致密的Fe_3O_4颗粒。Electrochemical workstation, metallographic microscope, X-ray diffractometer and atomic absorption spectrophotometer were used to study the electrochemical corrosion behavior and corrosion product features of T23 material under the conditions of different values of pH, temperature and S2 concentration. The results show that the corrosion degree of T23 increased with increasing temperature in the temperature range of 10-70℃. In the weak base solution S2 attacked the surface of T23 and blocked the OH- inhibitory action. Under the conditions of 70 ℃, pH=9 and 0. 1 mol/L S2- solution, Fe2 （SO4）3 or the Fe2 （SO3）3 was formed on the surface of T23 and Fe3O4 particles were formed on the surface of specimens soaked in the blank solution without S2-.

关 键 词：电化学 表面形貌 腐蚀产物 S2- 

分 类 号：TG172.6[金属学及工艺—金属表面处理]