抗硫油井管在H_(2)S环境中的电化学腐蚀行为研究  

Electrochemical Corrosion Behavior of SSC Resistant OCTG in H_(2)S Environment

作　　者：李阳 杨中娜 孙玉江 丁磊 李希明 顾顺杰 LI Yang;YANG Zhongna;SUN Yujiang;DING Lei;LI Ximing;GU Shunjie(Zhong Hai Hua Yang(Tianjin)Business Managing Co.,Ltd.,Tianjin 300457,China;CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,China;Tianjin Pipe Corporation,Tianjin 300301,China)

机构地区：[1]中海华洋(天津)企业管理服务有限公司,天津300457 [2]中海油(天津)管道工程技术有限公司,天津300452 [3]天津钢管制造有限公司,天津300301

出　　处：《石油管材与仪器》2024年第1期45-51,共7页Petroleum Tubular Goods & Instruments

摘　　要：采用极化曲线和电化学阻抗谱技术,研究了无外加应力下H_(2)S对110S抗硫油井管材腐蚀行为的影响。利用电化学渗氢技术,施加恒电流使氢向110S管材内部渗透,揭示了不同环境下的氢扩散特性。采用电化学噪声技术,结合扫描电镜(SEM)分析手段,研究了110S管材在95%AYS(实际屈服强度)加载力下,处于饱和H_(2)S的醋酸酸化NaCl溶液中的硫化物应力腐蚀(SSC)行为。结果表明:H_(2)S使极化电流增大,电荷转移电阻减小,降低了110S管材的耐蚀性能;恒电流充氢条件下,酸性溶液显著增加了氢的有效扩散系数和充氢侧次表面氢浓度;电位噪声峰具有快速下降和缓慢恢复的特征,裂纹萌生和扩展阶段暂态峰寿命增加,幅值增大;SSC裂纹萌生于阳极溶解产生的点蚀处,并不断扩展,直至断裂。The effect of H_(2)S on the corrosion behavior of 110S OCTG without external stress was investigated using polarization curve and electrochemical impedance spectroscopy(EIS) technology.The effective hydrogen diffusivity coefficient and sub-surface hydrogen concentration were obtained by electrochemical hydrogen permeation method.The sulfide stress corrosion behavior of 110S OCTG loaded to 95% actual yield strength(AYS) was studied by electrochemical noise(EN) technology in the acetate acidified NaCl solution containing saturated H_(2)S.The fracture morphology was analyzed by scanning electron microscope(SEM).The results show that the H_(2)S reduces corrosion resistance of 110S OCTG by increasing the polarization current density and decreasing the charge transfer resistance.Both effective hydrogen diffusivity coefficient and sub-surface hydrogen concentration are enhanced significantly in acidic solution,when 2 mA/cm^(2) constant current hydrogen charging is carried out.The electrochemical potential noise peaks of SSC have the characteristics of rapid decline and slow rise.The potential noise peak lifetime and amplitude increase during crack initiation and propagation.The sulfide stress corrosion cracking originates at the pitting corrosion caused by anodic dissolution and continues to expand until fracture.

关 键 词：极化曲线 电化学阻抗谱 电化学渗氢 电化学噪声 硫化物应力腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]