温度对UNS N08825合金在高含H_(2)S环境中耐腐蚀性能的影响  

Effect of Temperature on Corrosion Resistance of UNS N08825 Alloy under Environment with High Content of H_(2)S

作　　者：李科 李天雷[1,2] 张诚 姜流[1] 崔磊 施岱艳 曹晓燕 钟显康 LI Ke;LI Tianlei;ZHANG Cheng;JIANG Liu;CUI Lei;SHI Daiyan;CAO Xiaoyan;ZHONG Xiankang(Southwest Branch,China Petroleum Engineering and Construction CORP.,Chengdu 610041,China;China Petroleum Key Laboratory of Petroleum Tubing Mechanics and Environmental Behavior Sichuan Branch,PetroChina Company Limited,Chengdu 610041,China;School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油工程建设有限公司西南分公司,成都610041 [2]中国石油天然气集团公司,石油管力学和环境行为重点实验室四川分室,成都610041 [3]西南石油大学石油与天然气工程学院,成都610500

出　　处：《机械工程材料》2024年第4期76-82,共7页Materials For Mechanical Engineering

基　　金：中国石油集团工程股份有限公司科学研究与技术开发项目(2022ZYGC-12-02);中国石油工程建设有限公司西南分公司科研项目(FKY2021-208)。

摘　　要：在不同温度(80,90,110,132℃)、高压、高含H2S和高含氯离子环境中对UNS N08825合金进行了72 h浸泡和电化学腐蚀试验,研究了温度对合金耐腐蚀性能的影响,分析了其影响机理。结果表明:在80℃下试验合金几乎不发生腐蚀,90,110,132℃下合金表面出现黑色腐蚀产物,并且110,132℃下的腐蚀产物增多且呈疏松多孔特征;随着温度升高,合金表面的点蚀坑数量增多且深度增加,最大点蚀速率和均匀腐蚀速率均增大;随着温度升高,试验合金的自腐蚀电位、电荷转移电阻和钝化膜电阻减小,自腐蚀电流密度增大。当温度低于90℃时,合金表面钝化膜均匀致密,点蚀敏感性低,具有较好的耐腐蚀性能;当温度不低于90℃时,元素硫的水解加剧,合金表面钝化膜发生破坏,点蚀更易发生,耐腐蚀性能变差。The 72 h immersional and electrochemical corrosion tests of UNS N08825 alloy were carried out under environment with different temperature(80,90,110,132℃),high pressure,high content of H 2S/CO_(2) and high chloride ion content.The effect of the temperature on the corrosion resistance of the alloy were studied,and the effect mechanism was analyzed.The results show that no corrosion occured in the alloy at 80℃.Black corrosion product appeared on the surface of the alloy at 90,110,132℃.After corrosion at 110,132℃,the corrosion products increased in amount and showed loose porous characteristics.With the increase of temperature,the number and depth of pitting on the surface of the alloy increased,and the maximum pitting rate and uniform corrosion rate increased.With the increase of temperature,the self-corrosion potential,charge-transfer resistance and passivation film resistance of the test alloy decreased,and the self-corrosion current density increased.When the temperature was lower than 90℃,the passivation film on the alloy surface was uniform and dense,the pitting sensitivity was low,and the corrosion resistance was relatively good.When the temperature was not lower than 90℃,the hydrolysis of elemental sulfur was intensified,the passivation film on the alloy surface was destroyed,the pitting corrosion was more likely to occur,and the corrosion resistance became worse.

关 键 词：高温高压 UNS N08825合金 H_(2)S 氯离子 电化学 点蚀 

分 类 号：U463.342[机械工程—车辆工程]