Corrosion Behavior of 4Cr16Mo Martensite Stainless Steel with 1% Cu Addition by Applied Stress

doi:10.11902/1005.4537.2023.132

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 1094-1100 DOI: 10.11902/1005.4537.2023.132

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Corrosion Behavior of 4Cr16Mo Martensite Stainless Steel with 1% Cu Addition by Applied Stress

LI Jiayuan¹^,², ZENG Tianhao¹^,², LIU Youtong¹^,², WU Xiaochun¹^,²(

)

^1.School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
^2.State Key Laboratory of Metallurgy and Preparation of High Quality Special Steel, Shanghai University, Shanghai 200444, China

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Abstract

The corrosion resistance of 4Cr16Mo martensite stainless steels without and with 1%Cu addition (i.e., 4Cr16MoCu) in 3.5%NaCl solution was comparatively studied by three-point flexural loading stress corrosion test method. The results show that there is no significant difference in corrosion resistance between the two steels after tempering at 250 ℃. However, after tempering at 600 ℃, the corrosion resistance of 4Cr16MoCu steel is significantly enhanced. Through microstructure analysis, it is speculated that this is related to the precipitation of the Cu-rich phase. A stress corrosion model for the 4Cr16MoCu steel is proposed based on the characteristics and evolution process of corrosion morphology of the steel, i.e., in the early stage of corrosion, breaks of the passivation film may induce the emerging discrete anode- and cathode-spots on the steel surface, further result in an electrolytic polishing-like effect to peel off the surface passivation film and finally the pitting corrosion.

Key words: martensite stainless steel Cu-rich phase stress corrosion quasi-electrolytic polishing ion effect

Received: 04 May 2023 32134.14.1005.4537.2023.132

ZTFLH:

TG171

Fund: National Key R & D Program(2016YFB0300400)

Corresponding Authors: WU Xiaochun, E-mail: xcwu@staff.shu.edu.cn

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Cite this article:

LI Jiayuan, ZENG Tianhao, LIU Youtong, WU Xiaochun. Corrosion Behavior of 4Cr16Mo Martensite Stainless Steel with 1% Cu Addition by Applied Stress. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1094-1100.

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.132 OR https://www.jcscp.org/EN/Y2023/V43/I5/1094

Table 1 Composition of two experimental steel

Fig.1 Three-point bending stress corrosion experimental diagram: (a) device schematic diagram, (b) schematic diagram of sample sealing position

Fig.2 Corrosion morphology of samples under stress of 100 MPa: (a) 4Cr16MoCu tempered at 250 ℃, (b) 4Cr16Mo tempered at 250 ℃, (c) 4Cr16MoCu tempered at 600 ℃, (d) 4Cr16Mo tempered at 600 ℃

Fig.3 Raman spectroscopy analysis of corrosion products under 250 ℃ tempering temperature: (a) 4Cr16MoCu, (b) 4Cr16Mo

Fig.4 Local corrosion morphology of 4Cr16MoCu-250 ℃ tempered sample: (a) after 24 h, (b) after 168 h, (c) surface morphology after removing corrosion products, (d) surface morphology on 3D profilometer after removing corrosion products

Fig.5 STEM image and surface scanning results of 4Cr16MoCu tempered at 600 ℃: (a) STEM image of Cu-rich precipitation, (b) mapping result of Cu Kα1, (c) mapping result of Cr Kα1

Fig.6 Corrosion circle formation model

Fig.7 Corrosion morphology of 4Cr16Mo material: (a) corrosion surface morphology, (b) surface morphology after removing corrosion products, (c) SEM images of the same corrosion area, (d) surface morphology under white light interferometer

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