Influence of Surface-active Agent PFOA Molecular Film on Rust Removal and Corrosion Behavior of Rusty Carbon Steel

doi:10.11902/1005.4537.2016.217

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 81-86 DOI: 10.11902/1005.4537.2016.217

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Influence of Surface-active Agent PFOA Molecular Film on Rust Removal and Corrosion Behavior of Rusty Carbon Steel

Yinze ZUO¹, Baohua XU², Guisheng ZHU², Cheng HUANG², Qing FENG¹, Liang CHEN¹, Zhaolei LI¹, Yanmin GAO¹(

)

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 Jiangsu SOPO Company, SOPO Co., Ltd., Zhenjiang 212006, China

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Abstract

High surface-active ammonium perfluorooctanoic acid (PFOA) was selected as a surface treatment agent, and the influence of the concentration of PFOA on the rust removal effect for the rust scale and the corrosion behavior of the cleaned Q235 steel was investigated. The rust Q235 steel samples were derust in solutions with 1, 10, 100, 150 and 200 g/L PFOA respectively, and which then were characterized by means of contact angle measurement, electrochemical polarization curve measurement, and electrochemical impedance spectroscopy and SEM with EDS . Results show that PFOA solution has great speadability and wettability for the surface of rust steel and can penetrate the porous rust scale to the substrate surface to form adsorption film, which can weaken and even destroy the bonding between the rust and the substrate, thereby the rust can easy spall off. Among others the solution with 150 g/L PFOA presented the best derusting efficiency, i.e. the rust scale was completely removed, correspondingly the contact angle, the time of corrosion occurrence by copper sulfate drop test and electrochemical impedance all increased by 111.9%, 70% and 193% respectively, while the corrosion current decreased by 53.3% for the derust steel in comparison with the reference one.

Key words: PFOA molecular film rusty surface surface treatment electrochemical

Received: 07 November 2016

ZTFLH:

TG17

Fund: Supported by National Natural Science Fundation of China (51075197), Industry-university-research Cooperation Project in Jiangsu Province (BY2013066-12) and Graduate Innovation Fund of Jiangsu University of Science and Technology (YCX11S-24)

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	Yinze ZUO
	Baohua XU
	Guisheng ZHU
	Cheng HUANG
	Qing FENG
	Liang CHEN
	Zhaolei LI
	Yanmin GAO

Cite this article:

Yinze ZUO, Baohua XU, Guisheng ZHU, Cheng HUANG, Qing FENG, Liang CHEN, Zhaolei LI, Yanmin GAO. Influence of Surface-active Agent PFOA Molecular Film on Rust Removal and Corrosion Behavior of Rusty Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 81-86.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.217 OR https://www.jcscp.org/EN/Y2018/V38/I1/81

Fig.1 SEM image (a) and EDS analysis result (b) of the corrosion products of Q235 steel

Fig.2 XRD pattern of the corrosion products of Q235 steel

Fig.3 Macro appearances of Q235 steel with rust layer before (a) and after immersion in the deionized deionized water solutions containing 0 g/L (b), 1 g/L (c), 10 g/L (d), 100 g/L (e), 150 g/L (f) and 200 g/L (g) PFOA

Fig.4 SEM images of Q235 steel with rust layer before (a) and after immersion in deionized water solutions containing 0 g/L(b), 1 g/L (c), 10 g/L (d), 100 g/L (e), 150 g/L (f) and 200 g/L (g) PFOA

Fig.5 Polarization curves of Q235 steel with rust layer after immersion in deionized water solutions containing different contents of PFOA

Table 1 Corrosion parameters of Q235 steel with rust layer after immersion in deionized water solutions conting different contents of PFOA

Fig.6 Electrochemical impedance spectroscopies of Q235 steel with rust layer after immersion in deionized water solutions containing different contents of PFOA

Fig.7 Equivalent circuit model of Q235 steel after immersion in deionized water solutions containing different contents of PFOA

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