铁镍基合金925在含硫、H_2S和CO_2盐溶液中的腐蚀行为  

Corrosion Behavior of Iron-Nickel-Base Alloy 925 in Salt Solution Containing S,H_2S and CO_2

作　　者：王春光[1,2] 王东哲[1,2,3] 刘海定[1,2,3] 刘微 蔡欣男 陈登华[1] 

机构地区：[1]重庆材料研究院有限公司,重庆400707 [2]耐腐蚀合金重庆市重点实验室,重庆400707 [3]国家仪表功能材料工程技术研究中心,重庆400707

出　　处：《机械工程材料》2017年第2期85-88,共4页Materials For Mechanical Engineering

基　　金：重庆市"科技创新领军人才支持计划"(CSTCKJCXLJRC01);国家高技术研究发展"863"计划项目(2013AA031005);重庆市基础与前沿研究计划项目(CSTC2013jcyjA50035)

摘　　要：在150℃含硫、H_2S和CO_2的盐溶液中,对铁镍基合金925分别进行了均匀腐蚀和四点弯梁应力腐蚀试验,分析了腐蚀后的形貌和腐蚀产物组成,研究了腐蚀反应机理。结果表明:均匀腐蚀试验360h后,铁镍基合金925表面有明显的局部腐蚀现象,计算所得的均匀腐蚀速率约0.37mm·a^(-1),腐蚀产物主要由铁、镍和硫组成,单质硫的加入是合金发生局部腐蚀的主要原因;应力腐蚀试验1 080h后,该合金没有出现应力腐蚀开裂,腐蚀产物含有大量氧元素,说明有较多的H_2O或OH^-参与了腐蚀反应。The uniform corrosion and four point bend-beam stress corrosion tests of iron-nickel-base alloy 925 were conducted in the salt solution containing S, H2S and CO2 at 150℃. The corrosion morphology and corrosion product composition were analyzed and the corrosion reaction mechanism was investigated. The results show that after uniform corrosion testing for 360 h, obvious localized corrosion on the surface of the iron-nickel-base alloy 925 was observed; the calculated uniform corrosion rate was 0.37 mm·a-1; the corrosion product was composed of Fe, Ni and S; the addition of S was the main reason of the alloy localized corrosion. After stress corrosion testing for 1 080 h, no stress corrosion cracking was observed on the alloy; the corrosion product had a large number of element O, indicating that much H2O or OH- participated in the corrosion reaction.

关 键 词：铁镍基合金925 H2S 硫 盐溶液 均匀腐蚀 应力腐蚀 

分 类 号：TE982[石油与天然气工程—石油机械设备] TG172[金属学及工艺—金属表面处理]