Corrosion Resistance of 316 Stainless Steel after Low-temperature Low-pressure Arc Plasma Nitriding

doi:10.11901/1005.3093.2016.291

Chinese Journal of Materials Research

2017, Vol. 31

Issue (2): 81-87 DOI: 10.11901/1005.3093.2016.291

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Corrosion Resistance of 316 Stainless Steel after Low-temperature Low-pressure Arc Plasma Nitriding

Wenjin YANG^1,²,Yanhui ZHAO²(

),Mingli SHEN²,Zhanqi LIU²,Jinquan XIAO²,Jun GONG²,Baohai YU²,Chao SUN²

1 School of Materials Science and Engineering, University of Science and Technology of China, Anhui 230027, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Wenjin YANG,Yanhui ZHAO,Mingli SHEN,Zhanqi LIU,Jinquan XIAO,Jun GONG,Baohai YU,Chao SUN. Corrosion Resistance of 316 Stainless Steel after Low-temperature Low-pressure Arc Plasma Nitriding. Chinese Journal of Materials Research, 2017, 31(2): 81-87.

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Abstract

Low-pressure arc plasma nitriding is a novel rapid plasma nitriding process which can significantly enhance wear and corrosion resistance of austenite stainless steels. In this study, low temperature (~ 400℃) nitriding was applied to AISI 316 austenitic stainless steel (316 SS). A nitriding layer of 15 μm thickness was obtained just after 1 h processing, which is composed of an outer thin sublayer of nanocrystalline expanded austenite (nano-γ_N) with a trace of Cr nitrides and an inner thick coarse-grained expanded austenite (γ_N) sublayer. The thin surface nanolayer plays the key role in corrosion resistance of the nitrided layer, which promotes the formation of passive film. And the thickness of the passive film formed on the surface of the nitrided steel is 27 nm, which is two times over that on the bare 316 stainless steel. The corrosion current of nitrided steel is 3.55×10^-8 A/cm² in 3.5% NaCl solution, c.a. one order of magnitude lower than that of the untreated 316 austenite stainless steel (1.99×10^-7 A/cm²), which indicated that the nitrided layer had a lower corrosion rate. The pitting corrosion potential was not detected via electrochemical polarization experiments, exhibiting a better pitting corrosion resistance of the nitrided steel.

Key words: materials failure and protection low-pressure arc plasma nitriding nano-crystalline expanded austenite nitriding kinetics corrosion resistance

Received: 26 May 2016

Fund: Supported by National Natural Science Foundation of China (No.51171197)

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	Articles by authors
	Wenjin YANG
	Yanhui ZHAO
	Mingli SHEN
	Zhanqi LIU
	Jinquan XIAO
	Jun GONG
	Baohai YU
	Chao SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.291 OR https://www.cjmr.org/EN/Y2017/V31/I2/81

Fig.1 Schematic diagram of the low-pressure arc plasma-assisted nitriding device

Fig.2 Cross-sectional SEM images (a) and EPMA depth profiles (b) of the nitrided sample

Fig.3 XRD patterns of the untreated and nitrided samples

Fig.4 TEM image of the top-surface layer (a) and (c) of the nitrided layer, and their corresponding SAED patterns (b) and (d)

Fig.5 Surface morphology of the samples after immersed in 3.5% NaCl solution for 48 h (a) the substrate, (b) nitrided layer and (c) nitrided layer without nano-sublayer

Table 1 Corrosion potential (E_corr vs. SCE), Corrosion current density (Icorr) and Pitting potential (Ep vs. SCE) of samples in 3.5% NaCl solution

Fig.6 Potentiodynamic polarization curves of samples in 3.5% NaCl solution

Fig.7 XPS depth profiles of (a) 316 stainless steel substrate, (b) nitrided layer and (c) nitrided layer without nano-sublayer

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