Surface Hardness and Corrosion Behavior of AISI 420 Martensitic Stainless Steels Treated by Plasma Oxy-Nitriding Processing

Jinhan Kim; Kwangmin Lee

doi:10.3740/MRSK.2023.33.7.309

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2023 Vol.33, Issue 7 Preview Page Next Page

Research Paper

Surface Hardness and Corrosion Behavior of AISI 420 Martensitic Stainless Steels Treated by Plasma Oxy-Nitriding Processing 플라즈마 산질화처리된 AISI 420 마르텐사이트 스테인레스 강재의 표면 경도 및 부식 거동

27 July 2023. pp. 309-314

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Abstract

This study aimed to address the limitations of traditional plasma nitriding methods by implementing a short-term plasma oxy-nitriding treatment on the surface of AISI 420 martensitic stainless steel. This treatment involved the sequential formation of nitride and oxide layers, to enhance surface hardness and corrosion resistance, respectively. The process resulted in the formation of a 20 µm-thick nitride layer and a 3 µm-thick oxide layer on the steel surface. Initially, the hardness increased by 2.2 times after nitriding, followed by a subsequent decrease of approximately 31 % after oxidation. While the nitriding process reduced corrosion resistance, the subsequent oxidation process led to the formation of a passive oxide film, effectively resolving this issue. The pitting corrosion of the oxide passive film started at 82.6 mVssc, providing better corrosion resistance characteristics than the nitride layer. Consequently, the trade-off between surface hardness and corrosion resistance in plasma oxy-nitrided AISI 420 martensitic stainless steel is anticipated to be recognized as an innovative and comprehensive surface treatment process for biomedical components.

Keywords

AISI 420

plasma oxy-nitriding

micro-vickers hardness

potentiodynamic polarization test

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :7
Pages :309-314
Received Date : 2023-06-14
Revised Date : 2023-07-19
Accepted Date : 2023-07-20
DOI :https://doi.org/10.3740/MRSK.2023.33.7.309

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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