Pitting corrosion characteristics of sintered Type 316 L stainless steel: relationship between pores and MnS

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-06-07 DOI:10.1038/s41529-024-00482-6

Haruka Saito, Masashi Nishimoto, Izumi Muto

引用次数: 0

Abstract

In Type 316 L stainless steel fabricated from gas-atomized powder via spark plasma sintering, lack-of-fusion pores and MnS inclusions were identified as possible pitting initiation sites. Through potentiodynamic polarization with different working electrode areas, the distribution density of the identified pit initiation sites was compared with that of sites found on wrought Type 316 L stainless steel. Surface observations of the sintered Type 316 L after polarization suggest that pitting corrosion was initiated at a location where both MnS and pores existed. By reducing the porosity and removing MnS, the roles of pores and MnS inclusions in the initiation of pitting corrosion were investigated.

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烧结 316 L 型不锈钢的点腐蚀特性：孔隙与 MnS 之间的关系

在通过火花等离子烧结由气体原子化粉末制成的 316 L 型不锈钢中，发现了可能的点蚀起始点--熔融缺乏孔隙和 MnS 夹杂物。通过不同工作电极面积的电位极化，将已确定的点蚀起始点的分布密度与锻造的 316 L 型不锈钢上发现的点蚀起始点的分布密度进行了比较。极化后对烧结 316 L 型不锈钢的表面观察结果表明，点蚀是在同时存在 MnS 和孔隙的位置引发的。通过降低孔隙率和去除 MnS，研究了孔隙和 MnS 包裹体在引发点蚀中的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies