首页|H2S分压对SA387M Gr.11CL2(H)炼化管道用钢腐蚀行为的影响

H2S分压对SA387M Gr.11CL2(H)炼化管道用钢腐蚀行为的影响

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为了探究H2S分压对SA387M Gr.11CL2(H)炼化管道用钢腐蚀行为的影响,采用高压釜进行试验,通过SEM,EDS,XRD和EPMA分析了SA387M Gr.11CL2(H)钢腐蚀产物的形貌、成分和物相.结果表明,随着H2S分压(PH2S)的增加,SA387M Gr.11CL2(H)钢的腐蚀减薄量增大.PH2S≤0.5 MPa时,以全面腐蚀为主;PH2S=1.0 MPa时,钢发生全面腐蚀伴随局部腐蚀,应力促进了局部腐蚀.SA387M Gr.11CL2(H)钢耐硫化物应力腐蚀性能良好.PH2S≤0.5 MPa时,腐蚀产物膜中Cr的化合物和具有保护性的硫铁化合物发挥协同作用,有效阻止介质中Cl-的侵入;PH2S=1.0 MPa时,腐蚀产物膜中Cr的化合物含量少,生成的硫铁化合物不具有保护性.H2S分压影响了腐蚀产物膜的生成;Cr的化合物和硫铁化合物的组成和结构的变化,是导致SA387M Gr.11CL2(H)钢发生全面腐蚀和局部腐蚀的主要原因.
Effect of H2S partial pressure on corrosion behavior of SA387M Gr.11CL2(H)refining pipeline steel
In order to study the effect of H2S partial pressure on corrosion behavior of SA387M Gr.11CL2(H)refining pipeline steel,corrosion morphology,composition and phases of the corrosion products of SA387M Gr.11CL2(H)were investigated by autoclave tests,SEM,EDS,XRD and EPMA.The results indicate that corrosion thickness loss increases with the increase of H2S partial pressure(PH2S).When PH2S≤0.5 MPa,the corrosion of SA387M Gr.11CL2(H)is general corrosion.When PH2S is 1.0 MPa,the steel encounters general corrosion accompanied with local corrosion,and the stress promotes local corrosion.SA387M Gr.11CL2(H)steel possesses good resistance to sulfide stress corrosion(SSC).Chromium compound and iron sulfide compounds with protective property in the corrosion product film plays synergistic action to prevent Cl-ingression when PH2S is less than 0.5 MPa.The content of Cr compounds in the corrosion product film is low,and the generated iron sulfide compounds are not protective when PH2S is 1.0 MPa.The H2S partial pressure affects the generation of corrosion product film.The changes of the compositions and structures of chromium compound and iron sulfide compounds are the main cause for the occurrence of general corrosion and local corrosion.

refining pipeline steelH2S partial pressuresulfide stress cracking corrosionCr elementiron sulfide compound

艾芳芳、陈义庆、王储、刘智勇、钟彬、高鹏、李琳

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海洋装备用金属材料及其应用国家重点实验室,辽宁 鞍山 114009

鞍钢集团 钢铁研究院,辽宁 鞍山 114009

北京科技大学 新材料技术研究院,北京 100083

炼化管道用钢 H2S分压 硫化物应力腐蚀 Cr元素 硫铁化合物

辽宁省科技重大专项项目

2019JH1/10100001

2024

压力容器
中国机械工程学会压力容器分会

压力容器

CSTPCD北大核心
影响因子:1.384
ISSN:1001-4837
年,卷(期):2024.41(8)