ABSTRACT

This study extensively compares the corrosion behavior of austenitic 316L and Duplex 2205 stainless-steels at different partial pressures of H₂S gases. The results showed that the corrosion rate of both steels at 3 bar H₂S showed the highest rate among those parameter setups. 316L steel is dominated by both uniform and pitting corrosion under H₂S-containing conditions due to the dissolution of Cr present on the alloy surface. According to the cross-sectional analysis, a Cr enrichment layer formed at 0 bar H₂S in both steels. After depletion of the Cr compound in the passive film of both steels, Ni was enriched in the outer layer at 3 bar H₂S, forming Ni oxide/sulphide compounds within the passive layer. At 15 bar H₂S, Mo was enriched in 316L steel, while Fe and Cr were enriched on the 2205 steel surface. Thus, a kinetic study of the chemical composition of both steels was discussed.

摘要

本研究广泛比较了奥氏体 316L 和双相 2205 不锈钢在不同 H ₂ S 气体分压下的腐蚀行为。结果表明，两种钢在 3 bar H ₂ S 下的腐蚀速率在这些参数设置中表现出最高的速率。由于存在于合金表面的Cr溶解，316L钢在含H ₂ S条件下以均匀腐蚀和点腐蚀为主。根据横截面分析，两种钢在 0 bar H ₂ S 下均形成了 Cr 富集层。_{在两种钢的钝化膜中的 Cr 化合物耗尽后，在 3 bar H 2}下，Ni 在外层中富集S，在钝化层内形成 Ni 氧化物/硫化物化合物。在 15 bar H ₂ S 下，Mo 在 316L 钢中富集，而 Fe 和 Cr 在 2205 钢表面富集。因此，讨论了两种钢的化学成分的动力学研究。