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在选择性激光化SS316L中的局部腐蚀在高温下在CO2和H2盐中化

Deeparekha Narayanan¹, Alan Martinez¹, Ulises Martin¹

¹Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843 USA.

Npj Materials degradation

|May 13, 2024

概括

选择性激光化不钢316L在较高温度下由于局部化学异质,耐腐蚀性降低. 被动薄膜中的这些缺陷损害了稳定性,在恶劣的CO2和H2S环境中导致了显著的局部腐蚀.

科学领域:

材料科学材料科学材料科学
腐蚀工程腐蚀工程
表面科学是一门学科.

背景情况:

选择性激光化 (SLM) 在316L不钢中产生独特的微观结构.
了解SLM SS316L在侵蚀性环境中的腐蚀行为对于工业应用至关重要.
高压CO2,H2S和Cl-对材料完整性构成重大挑战.

研究的目的:

调查SLM SS316L的被动化和局部腐蚀机制.
评估材料在不同温度 (25°C和125°C) 的 CO2,H2S 和 Cl- 联合暴露下的性能.
为了将微观结构特征与腐蚀易感性相关联.

主要方法:

扫描凯尔文探针力显微镜 (SKPFM) 用于测量伏尔塔电位差异.
电化学阻抗光谱 (EIS) 和Mott-Schottky分析以评估被动薄膜的特性.
X射线光电子光谱 (XPS) 用于确定薄膜的组成和保护性.

主要成果:

在细胞内部和池边界 (MPB) 观察到的Cr/Mo耗尽.
MPB 显示的伏尔塔电位低于矩阵,表明优选的腐蚀点.
在125°C形成更有缺陷的被动薄膜,具有更高的S/O比率,导致坑更宽.
局部腐蚀始于MPB,并传播到细胞内部.

结论:

在SLM SS316L中的局部化学异质性损害了被动薄膜的稳定性.
高温加剧局部腐蚀,增加被动膜缺陷.
在研究条件下,MPB和细胞内部是SLM SS316L中腐蚀启动和传播的关键地点.

关键词:

腐蚀是一种腐蚀.金属和合金的使用.

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相关概念视频

Corrosion

Corrosion

The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...