Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution

doi:10.11902/1005.4537.2024.132

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1633-1640 DOI: 10.11902/1005.4537.2024.132

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Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution

ZHANG Zhuanli¹, DAI Hailong²(

), ZHANG Zhe², SHI Shouwen², CHEN Xu²(

)

1. Industrial Protection Engineering Center, Cnooc Energy Development Equipment Technology Co., Ltd., Tianjin 300457, China
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Cite this article:

ZHANG Zhuanli, DAI Hailong, ZHANG Zhe, SHI Shouwen, CHEN Xu. Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1633-1640.

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Abstract

The stress corrosion cracking (SCC) behavior of 316L stainless steel in HF solution was investigated by means of slow strain rate test (SSRT) and microscopy characterization. Results revealed that 316L stainless steel showed intense stress corrosion susceptibility in HF solution, correspondingly the mechanical property was greatly shortened for the tested steel. Stress corrosion is caused by the initial tear of the corrosion product film and the subsequent pitting corrosion caused by the synergistic action of mechanics and chemistry. The crack initiation of 316L stainless steel in HF solution shows the characteristics of multi-sites of initiation, i.e. the grain boundary, slip step and phase boundary between δ ferrite and matrix are the main sites of crack initiation. In all, mechanical deformation induced the rupture of corrosion products was essentially the inducement of SCC of 316L stainless steel in HF solution.

Key words: hydrofluoric acid slow strain rate test stress corrosion cracking 316L

Received: 23 April 2024 32134.14.1005.4537.2024.132

ZTFLH:

TG172

Fund: National Key Research and Development Program of China(2022YFC3004500)

Corresponding Authors: DAI Hailong, E-mail: hldai@tju.edu.cn；
CHEN Xu, E-mail: xchen@tju.edu.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.132 OR https://www.jcscp.org/EN/Y2024/V44/I6/1633

Fig.1 Geometry size of SSRT sample

Fig. 2 Stress-strain curves of 316L stainless steel under different condition (air, 2%HF solution and 10%HF solution) obtained by SSRT (a) and its SCC susceptibility (b)

Table 1 Mechanical parameters of 316L stainless steel in air and HF solution

Fig.3 Fracture morphologies of 316L stainless steel in air (a), 2%HF solution (b) and 10%HF solution (c) after SSRT

Fig.4 Surface morphologies (a-d) of 316L stainless steel in 10%HF solution after SSRT

Fig.5 Tearing feature of corrosion product on 316L stainless steel in 10%HF solution after SSRT (a, b), and corresponding EDS mapping (a) and line scan results (b)

Fig.6 Cross-section (a, b) and surface (c-e) SEM images of 316L stainless steel in 10%HF solution after SSRT

Fig.7 EBSD results of cross-section of 316L stainless steel in 10%HF solution after SSRT: (a) IPF image, (b) KAM image, (c) phase image

Fig.8 Interfacial cracking on surface induced by δ-ferrite (a) and EDS line scan result (b), and nano-indentation results of δ-ferrite and austenitic (c, d)

Fig.9 Schematic diagram of SCC process and pit formation of 316L stainless steel in HF solution after SSRT

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