摘要
通过在高压釜内放置1Cr18Ni9Ti不锈钢电极和Cu电极组成原电池,研究了1Cr18Ni9Ti不锈钢在高温高压NaCl-H2S-H2O溶液中的原电池腐蚀行为。结果表明:原电池的腐蚀电流密度随温度升高和压力增大呈波动性变化,在沸点和临界点附近均出现极大值,且极大值随着NaCl和H2S浓度升高而增大。最大腐蚀电流密度在Cl-浓度较小(0．01 mol/L)时出现在亚临界腐蚀区(350℃,21．5 MPa左右),而在Cl-浓度较大(0．1 mol／L)时则出现在超临界腐蚀区(450℃,38．4 MPa左右)。根据腐蚀形貌探讨了1Cr18Ni9Ti不锈钢原电池的腐蚀规律。
The galvanic corrosion behavior of 1Cr18Ni9Ti stainless steel in high-temperature and high-pressure services has been studied by placement of galvanic cell of 1Cr18Ni9Ti and Cu electrodes in high-pressure autoclave. The results show that the corrosion current density of galvanic cell fluctuates with the rising temperature and pressure. The maximum value appears near the boiling point and critical point, which becomes increasingly greater with the rising NaCl and H： S concentrations. At a lower Cl^- （0.01 mol/L）, the maximum corrosion current is in the： sub-critical corrosion area （about 350 ℃, 21.5 MPa）, and at a higher Cl^- , it is in the super-critical corrosion area （about 450 ℃, 38.4 MPa）. The corrosion laws of galvanic cell of 1Cr18Ni9Ti stainless steel is investigated based upon corrosion forms.
出处
《石油化工腐蚀与防护》
CAS
2006年第5期1-4,共4页
Corrosion & Protection In Petrochemical Industry
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-124)
