EFFECTS OF OXIDE SCALE ON CORROSION PERFORMANCE OF SS400 HOT ROLLED STRIP

J Chin Soc Corr Pro

2012, Vol. 32

Issue (2): 109-114 DOI:

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EFFECTS OF OXIDE SCALE ON CORROSION PERFORMANCE OF SS400 HOT ROLLED STRIP

ZHOU Xianliang^1,2, ZHU Min², HUA Xiaozhen², WU Ning³, YE Zhiguo²

1. Key Laboratory of Nondestructive Test, Ministry of Education, Nanchang Hangkong University, Nanchang 330063
2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063
3. JiangXi Hongdu Aviation Industry (Group) Corporation Limited, Nanchang 330024

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Abstract SEM, XRD and EDS were used to observe and analyze the structure and phase composition of the oxide scale on the SS400 hot rolled strip steel prepared by heat treatment in the laboratory. Electrochemical polarization, electrochemical impedance spectroscopy (EIS) and scanning Kelvin probing (SKP) were also used to reveal the relationship between the state of the oxide scale of hot rolled strip and its corrosion behavior. The results showed that the continuous, compact and integrated oxide scale could retard the general corrosion rate and protect steel substrate. With corrosion time increasing, the potential difference between the cathodic and anodic areas in corrosion cell increased, so the strip corroded more quickly, accompanied with the appearance of the distinct characters of localized corrosion and the cathodic and anodic areas separated from each other evidently. Therefore, the protective effect of the oxide scale to the base metal was weakened.

Key words: SS400 hot rolled strip oxide scale corrosion resistance EIS SKP

Received: 15 April 2011

ZTFLH:

TG172.3

Corresponding Authors: ZHOU Xianliang E-mail: zmii2009@163.com

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ZHOU Xianliang, ZHU Min, HUA Xiaozhen, WU Ning, YE Zhiguo. EFFECTS OF OXIDE SCALE ON CORROSION PERFORMANCE OF SS400 HOT ROLLED STRIP. J Chin Soc Corr Pro, 2012, 32(2): 109-114.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I2/109

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