Effect of Mg on Corrosion of 316H Stainless Steel in Molten Salts MgCl2-NaCl-KCl

doi:10.11902/1005.4537.2020.012

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (1): 80-86 DOI: 10.11902/1005.4537.2020.012

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Effect of Mg on Corrosion of 316H Stainless Steel in Molten Salts MgCl₂-NaCl-KCl

ZUO Yong¹^,²^,³(

), CAO Mingpeng¹^,³, SHEN Miao¹^,², YANG Xinmei¹^,²^,³

^1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
^2.Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, China
^3.University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

The effect of Mg on purification of molten salts MgCl₂-NaCl-KCl (MNKC) and corrosion behavior of 316H stainless steel in MNKC molten salts were investigated by means of immersion test and electrochemical means. Results indicated that the corrosion of 316H stainless steel in MNKC molten salts at 600 ℃ was well inhibited when the addition amount of Mg exceeds 500 μg·g^-1, correspondingly, 316H stainless steel presents the free corrosion potential of E_corr＜-0.80 V vs NiCl₂/Ni, corrosion current density of I_corr＜25 μA/cm², and linear polarization resistance of R_p＞800 Ω·cm². The purification and corrosion inhibition mechanism of Mg for the MNKC molten salts were discussed simultaneously.

Key words: chloride molten salt corrosion mitigation 316H stainless steel concentrated solar power (CSP)

Received: 17 January 2020

ZTFLH:

TG174

Fund: Strategic Priority Research Program of Chinese Academy of Sciences(XDA21000000)

Corresponding Authors: ZUO Yong E-mail: zuoyong@sinap.ac.cn

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ZUO Yong, CAO Mingpeng, SHEN Miao, YANG Xinmei. Effect of Mg on Corrosion of 316H Stainless Steel in Molten Salts MgCl₂-NaCl-KCl. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 80-86.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.012 OR https://www.jcscp.org/EN/Y2021/V41/I1/80

Fig.1 Cyclic voltammetric curves of MNKC molten salt on a tungsten electrode at 600 ℃ with a scan rate of 0.1 V/s

Fig.2 Dependence of the corrosion potential of the 316H stainless steel on the amount of magnesium added into the MNKC molten salt at 600 ℃

Fig.3 Polarization curves of the 316H stainless steel in MNKC-Mg (0~1200 μg·g^-1) system

Fig.4 Dependence of the corrosion current density of the 316H stainless steel on the amount of magnesium added into the MNKC molten salt at 600 ℃

Fig.5 Dependence of the linear polarization resistance of the 316H stainless steel on the amount of magnesium added into the MNKC molten salt at 600 ℃

Fig.6 Cyclic voltammetric curves of MNKC-0.2%CrCl₂ molten salt on a tungsten electrode at 600 ℃ with a scan rate of 0.1 V/s

Table 1 Assignment of redox peaks in the cyclic voltammetry curve

Fig.7 Cross-sectional SEM image of the 316H stainless steel exposed in molten MNKC-500 μg·g^-1 Mg under Ar atmosphere at 600 °C for 100 h

Fig.8 Cross-sectional SEM image of the 316H stainless steel exposed in molten MNKC without Mg under Ar atmosphere at 600 °C for 100 h

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