元素硫对G3合金在H2S+CO2饱和氯化物溶液中腐蚀行为的影响（英文）  

Influence of Elemental Sulfur on the Corrosion Behavior of Alloy G3 in H2S+CO2 Saturated Chloride Solution

作　　者：范舟[1] 王子瑜 刘建仪 黄泰愚 赵星[1] 胡晓刚 Fan Zhou;Wang Ziyu;Liu Jianyi;Huang Taiyu;Zhao Xing;Hu Xiaogang(Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Gas Reservoir Geology and Exploitation,Chengdu 610500,China;Chongqing HKC Optoelectronics Technology Co.Ltd,Chongqing 401346,China)

机构地区：[1]西南石油大学,四川成都610500 [2]油气藏地质及开发工程国家重点实验室,四川成都610500 [3]重庆惠科金渝光电科技有限公司,重庆401346

出　　处：《稀有金属材料与工程》2019年第10期3167-3174,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51474181);State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation Open Fund Project(PLN1516)

摘　　要：利用电化学显微镜(SECM)、扫描电子显微镜(SEM)和电化学阻抗谱(EIS)研究了镍基合金G3在室温(25℃)和高温(90℃)含H2S、CO2,Cl-的介质环境中各种硫状态下的腐蚀行为。结果表明,随温度升高,腐蚀变得更加严重,镍基合金G3表面出现轻微的点蚀;阳极极化曲线在室温下具有钝化区,而在90℃的温度下出现活性溶解区,钝化现象消失。物相分析表明,在镍基合金G3上形成的钝化膜主要由Ni、Cr及Fe的氧化物组成,由于S2-侵入薄膜,导致钝化膜溶解,腐蚀产物由NiS、FeS2组成。G3合金在含硫环境中的耐腐蚀性减弱,与沉积硫、析出硫相比较,悬浮硫状态下,镍基合金G3表面钝化膜最致密,腐蚀最轻微。研究表明,硫是强氧化剂,其存在导致严重的局部腐蚀,元素硫的状态是影响腐蚀产物膜的致密性和生长速率的关键因素,也是影响合金腐蚀速率的关键因素。Electrochemical microscope(SECM),scanning electron microscopy(SEM) and electrochemical impedance spectroscopy(EIS) were used to study the nickel-based alloy G3’s corrosive behavior in various sulfur states in a medium environment containing H2S,CO2,Cl- at room temperature(25 ℃) and high temperature(90 ℃).The results show that the corrosion degree becomes more serious with the increasing temperature,and slight pitting appears on the surface of the nickel-based alloy G3;the anode polarization curve has a passivation region at room temperature,and the active dissolution appears and passivation phenomenon disappears at a temperature of 90 ℃.The X-ray diffraction indicates that the passivation film formed on the nickel-based alloy G3 is mainly composed of oxides of Ni,Cr and Fe.The passivation film is dissolved due to the S2- intrusion film,the corrosion products are composed of Ni S and FeS2,and the G3 alloy’s corrosion resistance is weakened in the sulfur-containing environment.Compared with the deposition and precipitation of sulfur,the suspended sulfur has the densest passivation film and the least corrosion.Studies have shown that sulfur is a strong oxidant,and its existence leads to severe local corrosion.The state of elemental sulfur is a key factor affecting the compactness and growth rate of corrosion product membranes,and also a key factor affecting the corrosion rate of alloys.

关 键 词：镍基合金G3 腐蚀行为 极化曲线 阻抗谱 钝化膜 腐蚀形貌 

分 类 号：TG1[金属学及工艺—金属学]