Effect of Passivation Time on Corrosion Resistance of 304 Stainless Steel

doi:10.11902/1005.4537.2025.023

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1741-1747 DOI: 10.11902/1005.4537.2025.023

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Effect of Passivation Time on Corrosion Resistance of 304 Stainless Steel

HUANG Zebang¹, LIU Guangming¹(

), FAN Wenxue², XU Ruizhong³, ZHU Yanbin¹, LIU Chenhui¹

1 Jiangxi Provincial Key Laboratory of Lightweight Composite Materials, Nanchang Hangkong University, Nanchang 330063, China
2 China Anhui Dingwang Environmental Protection Material Technology Co. Ltd. , Xuancheng 242000, China
3 College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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HUANG Zebang, LIU Guangming, FAN Wenxue, XU Ruizhong, ZHU Yanbin, LIU Chenhui. Effect of Passivation Time on Corrosion Resistance of 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1741-1747.

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Abstract

The effect of passivation time of 304 stainless steel in nitrate and sulfuric acid solution on its corrosion resistance was assessed by means of electrochemical methods, in terms of the optimal passivation time, and the corrosion morphology of polarized steel. The results demonstrate that the passivation time has a significant effect on the corrosion resistance of 304 stainless steel. With the increasing passivation time, the corrosion resistance first increases and then decreases, and the corrosion resistance is the best when passivation time is 70 min. In comparison with the 70-minute passivation, the corrosion current density I_corr of the passivated film at 90 min increased from 7.032 × 10^-7 to 3.630 × 10^-6 A·cm^-2, the passivated film resistance R_f decreased from 5.514 × 10⁴ to 1.024 × 10⁴ Ω·cm², the doners density N_D increased from 2.580 × 10²⁰ to 11.47 × 10²⁰ cm^-3 and the corrosion resistance decreased.

Key words: 304 stainless steel passivation time passivation film electrochemical test corrosion resistance

Received: 15 January 2025 32134.14.1005.4537.2025.023

ZTFLH:

TG178

Fund: National Natural Science Foundation of China(51961028)

Corresponding Authors: LIU Guangming, E-mail: gemliu@126.com

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	HUANG Zebang
	LIU Guangming
	FAN Wenxue
	XU Ruizhong
	ZHU Yanbin
	LIU Chenhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.023 OR https://www.jcscp.org/EN/Y2025/V45/I6/1741

Fig.1 Metallographic structure of 304 stainless steel (a) and magnified image of the region 1 marked in Fig.1a (b)

Fig.2 Diagram of electrochemical corrosion pool

Fig.3 Polarization curves of 304 stainless steel passivated at 60 ^oC for different time

Table 1 Fitting parameters of polarization curves in Fig.3

Fig.4 Nyquist (a) and Bode (b) plots of 304 stainless steel after passivation at 60 ^oC for different time

Fig.5 Equivalent circuit model for fitting electrochemical impedance spectra

Table 2 Fitting parameters of electrochemical impedance spectra in Fig.4

Fig.6 Mott-Schottky curves of 304 stainless steel after passivation at 60 ^oC for different time

Table 3 Fitting parameters of Mott-Schottky curves in Fig.6

Fig.7 SEM morphologies of 304 stainless steel after polarization (a) and enlarged image of the region 2 marked in Fig.7a (b)

Fig.8 SEM morphologies of 304 stainless steel after polarization (a) and enlarged image of the circular area marked in Fig.8a (b)

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