Passivation and Pitting of 316L and HR-2 Stainless Steel in Hydrochloric Acid Liquid Membrane Environment

doi:10.11902/1005.4537.2019.221

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 17-24 DOI: 10.11902/1005.4537.2019.221

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Passivation and Pitting of 316L and HR-2 Stainless Steel in Hydrochloric Acid Liquid Membrane Environment

HE Zhuang,WANG Xingping,LIU Zihan,SHENG Yaoquan,MI Mengxin,CHEN Lin,ZHANG Yan,LI Yuchun(

)

School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, China

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Abstract

With a home-made facility, the corrosion behavior of 316L and HR-2 stainless steels at 60~90 ℃ beneath thin films of condensate HCl steam of 1, 0.5 and 0.1 mol/L HCl solutions was assessed by means of mass loss method, resistance probe, Tafel polarization measurement, electrochemical impedance spectroscopy, metallographic microscope and XRD. Results show that the corrosion rate of the two stainless steels accelerates with time in the initial stage, then slows down and finally stabilizes. The corrosion rate of 316L is faster. Both stainless steels can form stable passivation zone with more or less the same maintaining passivity current densities. The passivation interval of the HR-2 steel is higher than that of 316L steel, indicating that former is more resistant to corrosion. In addition, the corrosion products of the two stainless steel surfaces are basically the same, however, the corrosion product on the 316L steel is much dense. Due to the fact that the oxygen in the corrosion product scale is replaced by the competition of Cl^-, correspondingly, the passivation film on the surface of the steel may tend to crack and be difficult to be healed, therefore, pitting corrosion may be initiated of the stainless steels.

Key words: stainless steel liquid film environment simulation device electrochemical test passivation and pitting characterization and analysis

Received: 16 May 2019

ZTFLH:

TG174

Corresponding Authors: Yuchun LI E-mail: iamlyc@263.net

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	Zhuang HE
	Xingping WANG
	Zihan LIU
	Yaoquan SHENG
	Mengxin MI
	Lin CHEN
	Yan ZHANG
	Yuchun LI

Cite this article:

HE Zhuang,WANG Xingping,LIU Zihan,SHENG Yaoquan,MI Mengxin,CHEN Lin,ZHANG Yan,LI Yuchun. Passivation and Pitting of 316L and HR-2 Stainless Steel in Hydrochloric Acid Liquid Membrane Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 17-24.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.221 OR https://www.jcscp.org/EN/Y2020/V40/I1/17

Fig.1 Electrochemical test experimental device

Table 1 Compositions of 316L and HR-2 stainless steel (mass fraction / %)

Table 2 Tafel fitting data of 316L and HR-2 stainless steel at 1 mol/L HCl solution of different temperatures

Table 3 Tafel fitting data of 316L and HR-2 stainless steel at 0.5 mol/L HCl solution of different temperatures

Table 4 Tafel fitting data of 316L and HR-2 stainless steel at 0.1 mol/L HCl solution of different temperatures

Fig.2 Equivalent circuit diagram of EIS

Fig.3 Electrochemical impedance diagram of 316L (a) and HR-2 (b) stainless steel 1 mol/L HCl solutions at 90, 70 and 60 ℃

Fig.4 Electrochemical impedance diagram of 316L (a) and HR-2 (b) stainless steel at 0.5 mol/L HCl solutions at 90, 70 and 60 °C

Fig.5 Electrochemical impedance diagram of 316L (a) and HR-2 (b) stainless steel at 0.1 mol/L HCl solutions at 90, 70 and 60 °C

Fig.6 Corrosion kinetics curves of two materials after immersion in 1 mol/L (a) and 0.5 mol/L (b) hydrochloric acid solution for different simulation time

Fig.7 Corrosion kinetics curves of two material resistance probes after immersion in 1 mol/L (a) and 0.5 mol/L (b) hydrochloric acid solution for different simulation time

Fig.8 Metallographic morphologies of 316L (a, c, e) and HR-2 (b, d, f) stainless steels at a concentration of 0.5 mol/L hydrochloric acid solution for 24 h (a, b), 96 h (c, d) and 144 h (e, f)

Fig.9 XRD patterns of 316H and HR-2 steels after imm-ersion in 0.5 mol/L hydrochloric acid solution for 144 h

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