含H_(2)S环境中马氏体不锈钢的应力腐蚀敏感性  

Stress Corrosion Sensitivity of Martensitic Stainless Steel in H_(2)S Environment

作　　者：赵雪会 戚建晶[3] 刘君林[4] 李宏伟[4] 杜全庆[5] 韩燕[1] 付安庆 ZHAO Xuehui;QI Jianjing;LIU Junlin;LI Hongwei;DU Quanqing;HAN Yan;FU Anqing(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an 710077,China;State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi'an 710049,China;Research Institute of Oil and Gas Technology of Changqing Oilfield Company,Xi'an 710018,China;Drilling and Production Technology Research Institute of Qinghai Oilfield Company,Dunhuang 736202,China;No.4 Production Plant of Qinghai Oilfield,Mangya 816400,China)

机构地区：[1]中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077 [2]西安交通大学金属材料强度国家重点实验室,西安710049 [3]长庆油田分公司油气工艺研究院,西安710018 [4]青海油田分公司钻采工艺研究院,敦煌736202 [5]青海油田第四采油厂,茫崖816400

出　　处：《腐蚀与防护》2022年第1期31-37,共7页Corrosion & Protection

基　　金：国家重点研发计划(2017YFB0304905);陕西省重点研发计划(2018ZDXM-GY-171);中石油集团重大专项(2014E-3603)。

摘　　要：在模拟油田CO_(2)/H_(2)S共存环境中,利用高温高压模拟试验、四点弯曲应力加载方法及扫描电子显微镜分析评价了13Cr不锈钢在模拟油田环境中应力和缝隙协同作用下的应力腐蚀敏感性。结果表明:在CO_(2)和H_(2)S环境中无应力条件下,13Cr不锈钢均有稳定的阳极钝化区,但环境中出现H_(2)S后,其自腐蚀电位明显降低,腐蚀速率相对增大,点蚀敏感性增大,加载应力(80%σ_(s))后,材料表面钝化状态不稳定;在H_(2)S分压为0.1 MPa的高温高压环境中,当加载80%σ_(s)应力并协同0.1 mm缝隙作用时,13Cr不锈钢表面缝隙处出现了点蚀现象,但并未扩展导致应力腐蚀开裂;当H_(2)S分压增大至0.5 MPa并加载80%σ_(s)应力时,试样发生应力腐蚀开裂。H_(2)S的存在增大了材料表面的活性,促进腐蚀损伤的加速。In CO_(2)/H_(2)S coexisting environment simulating oil field,the stress corrosion sensitivity of 13 Cr stainless steel under the interaction of stress and crevice in simulated oilfield environment was evaluated by means of high temperature and high pressure simulation test,four-point bending stress loading method and scanning electron microscopy.The results show that under stress-free condition in CO_(2) and H_(2)S environments the 13 Cr stainless steel had stable anodic passivation zones.But the corrosion potential was significantly reduced when H_(2)S occurred in the environment,the corrosion rate and pitting corrosion sensitivity were relatively increased,and the passivation state of the material surface was unstable after loading stress(80%σ_(s)).In a high temperature and high pressure environment at H_(2)S partial pressure of 0.1 MPa and under the interaction of 80% σ_(s) stress and 0.1 mm crevice,pitting corrosion appeared in the crevices on the surface of 13 Cr stainless steel,but did not expand to cause stress corrosion cracking.When the partial pressure of H_(2)S increased to 0.5 MPa,stress corrosion cracking occurred when stress of 80% σ_(s) was loaded.The presence of H_(2)S increased the activity of the material surface and accelerated the corrosion damage.

关 键 词：不锈钢 应力腐蚀 缝隙腐蚀 协同作用 点蚀 

分 类 号：TQ172[化学工程—水泥工业]