极高CO压力对13Cr不锈钢腐蚀膜形成的影响。

Effect of extremely high CO pressure on the formation of the corrosion film on 13Cr stainless steel.

作者信息

Zhu Jinyang, Li Dapeng, Zhang Yunan, Zhang Lei

机构信息

National Center for Materials Service Safety, University of Science and Technology Beijing Beijing 100083 PR China.

CNOOC Research Institute Beijing 100028 PR China.

出版信息

RSC Adv. 2019 Nov 26;9(66):38597-38603. doi: 10.1039/c9ra08373a. eCollection 2019 Nov 25.

DOI:10.1039/c9ra08373a

PMID:35540226

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9076110/

Abstract

The corrosion behaviors of 13Cr martensitic steel under different CO partial pressures (4-28 MPa) were investigated by weight loss tests and surface characterizations. The results show that the corrosion rate of 13Cr steel shows a sharp increase under higher CO pressure (28 MPa), which reached approximately 20-180 times as large as those under lower CO pressures (4-12 MPa). Under the lower CO pressures, a single-layered Cr(OH) passive film forms and completely covers the steel surface. However, when the CO pressure reaches 28 MPa, a very different corrosion film which contains an inner Cr(OH) passive layer and an outer FeCO layer forms, and the inner passive layer shows local damage. This phenomenon can be explained by the lower pH (∼2.75) and the higher HCO concentration in the solution under the higher CO pressure.

摘要

通过失重试验和表面表征研究了13Cr马氏体钢在不同CO分压（4 - 28 MPa）下的腐蚀行为。结果表明，在较高CO压力（28 MPa）下，13Cr钢的腐蚀速率急剧增加，达到较低CO压力（4 - 12 MPa）下的约20 - 180倍。在较低CO压力下，形成单层Cr(OH)钝化膜并完全覆盖钢表面。然而，当CO压力达到28 MPa时，形成了一种非常不同的腐蚀膜，其包含一个内层Cr(OH)钝化层和一个外层FeCO层，并且内层钝化层出现局部损伤。这种现象可以用较高CO压力下溶液中较低的pH值（约2.75）和较高的HCO浓度来解释。