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在高温下，选择性激光熔化的SS316L在CO和HS盐水中的局部腐蚀。

Localized corrosion in selective laser melted SS316L in CO and HS brines at elevated temperatures.

作者信息

Narayanan Deeparekha, Martinez Alan, Martin Ulises, Mansoor Bilal, Case Raymundo, Castaneda Homero

机构信息

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

Texas A&M University at Qatar, Doha, Qatar.

出版信息

Npj Mater Degrad. 2024;8(1):50. doi: 10.1038/s41529-024-00468-4. Epub 2024 May 10.

DOI:10.1038/s41529-024-00468-4
PMID:38736645
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11087244/
Abstract

In this work, the passivation and localized corrosion of selective laser melted (SLM) stainless steel 316 L when exposed to high pressures of CO with the presence of HS and Cl at 25 °C and 125 °C were studied. Depletion of Cr/Mo was observed at the cell interiors and melt-pool boundaries (MPBs) compared to the cell boundaries. Volta potential differences obtained from scanning Kelvin probe force microscopy (SKPFM) showed that the MPBs were 8-20 mV lower than the matrix, while the cell interiors were 20-50 mV lower than the cell boundaries. Electrochemical impedance spectroscopy (EIS) and Mott-Schottky tests indicated a more defective passive film at 125 °C, and X-ray photoelectron spectroscopy (XPS) confirmed the formation of a less protective film with an increased S/O ratio at 125 °C than 25 °C. Initiation of localized corrosion was observed at the MPBs and pits formed after a week of immersion were wider by an order of magnitude at 125 °C than 25 °C, with evidence of cell-interior dissolution. While passivity was observed even at elevated temperatures, local chemical heterogeneities compromised the stability of the film and contributed to localized corrosion in SLM SS316L.

摘要

在本研究中，对选择性激光熔化（SLM）的316 L不锈钢在25 °C和125 °C下暴露于含有HS和Cl的高压CO环境中的钝化和局部腐蚀情况进行了研究。与晶胞边界相比，在晶胞内部和熔池边界（MPB）处观察到Cr/Mo的贫化。通过扫描开尔文探针力显微镜（SKPFM）获得的伏打电位差表明，MPB比基体低8 - 20 mV，而晶胞内部比晶胞边界低20 - 50 mV。电化学阻抗谱（EIS）和莫特 - 肖特基测试表明，在125 °C时钝化膜的缺陷更多，X射线光电子能谱（XPS）证实，与25 °C相比，在125 °C时形成的保护性较差的膜的S/O比增加。在MPB处观察到局部腐蚀的起始，浸泡一周后形成的点蚀在125 °C时比25 °C时宽一个数量级，并有晶胞内部溶解的迹象。虽然即使在高温下也观察到了钝化现象，但局部化学不均匀性损害了膜的稳定性，并导致了SLM SS316L中的局部腐蚀。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/809684dc1100/41529_2024_468_Fig13_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/babd49dde259/41529_2024_468_Fig9_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/4a63bb662418/41529_2024_468_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/809684dc1100/41529_2024_468_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/28ee2c6376e4/41529_2024_468_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/9512364f0fb8/41529_2024_468_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/1bc76ea62c63/41529_2024_468_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/e66ff859025a/41529_2024_468_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/aa06d04995b8/41529_2024_468_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/cc587449ca90/41529_2024_468_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/10cac9a7f728/41529_2024_468_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/51a39cbd0d0a/41529_2024_468_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/babd49dde259/41529_2024_468_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/8370457de39e/41529_2024_468_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/5e5ec4a80ebc/41529_2024_468_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/4a63bb662418/41529_2024_468_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/44e2/11087244/809684dc1100/41529_2024_468_Fig13_HTML.jpg

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本文引用的文献

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The Effect of HS Pressure on the Formation of Multiple Corrosion Products on 316L Stainless Steel Surface.高压对316L不锈钢表面多种腐蚀产物形成的影响。
ScientificWorldJournal. 2020 Jul 26;2020:3989563. doi: 10.1155/2020/3989563. eCollection 2020.