Effect of Corrosion Product Film Formed in Artificial Solution Simulated Soil Medium at Ku'erle Area onPitting Corrosion Behavior of X80 Pipeline Steel

doi:10.11902/1005.4537.2015.151

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (4): 313-320 DOI: 10.11902/1005.4537.2015.151

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Effect of Corrosion Product Film Formed in Artificial Solution Simulated Soil Medium at Ku'erle Area onPitting Corrosion Behavior of X80 Pipeline Steel

Di ZHANG¹,Ping LIANG¹(

),Yunxia ZHANG²,Yanhua SHI¹,Hua QIN¹

1. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China
2. Continual Education Institute, Liaoning Shihua University, Fushun 113001, China

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Abstract

The evolution of corrosion product film formed on X80 pipeline steel in artificial solution,which simulate the soil medium at Ku'erle area, with different immersion time was studied by immersion tests, while the morphology and phase constituent of the corrosion product film was characterized by means of scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. The effect of corrosion product film on the pitting corrosion of X80 pipeline steel was investigated by cyclic polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that the thickness and compactness of corrosion product film gradually increased with increasing immersion time. After immersion for 168 h, the corrosion product film was clearly divided into two layers. The pitting of X80 pipeline steel may be hindered or inhibited by the corrosion product film, which may reduce the probability of pitting initiation, and increase the resistance to pitting growth.

Key words: corrosion product film pitting corrosion cyclic polarization X80 pipeline steel

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	Di ZHANG
	Ping LIANG
	Yunxia ZHANG
	Yanhua SHI
	Hua QIN

Cite this article:

Di ZHANG,Ping LIANG,Yunxia ZHANG,Yanhua SHI,Hua QIN. Effect of Corrosion Product Film Formed in Artificial Solution Simulated Soil Medium at Ku'erle Area onPitting Corrosion Behavior of X80 Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 313-320.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.151 OR https://www.jcscp.org/EN/Y2016/V36/I4/313

Fig.1 Macro-morphologies of the corrosion product films of X80 pipeline steel after immersion in Ku'erle soil simulation solution for 6 h (a), 12 h (b), 24 h (c), 96 h (d) and 168 h (e)

Fig.2 Surface micromorphologies of the outer layers of corrosion product films formed on X80 pipeline steel after immersion in Ku'erle soil simulation solution for 6 h (a), 24 h (b), 96 h (c), the outer layer for 168 h (d), the inner layer for 168 h (e) and EDS result (f)

Fig.3 XRD spectra of the outer layer (a) and inner layer (b) of corrosion product film formed on X80 pipeline steel after immersion in Ku'erle soil simulation solution for 168 h

Fig.4 Cyclic polarization curves obtained in 0.5 mol/L NaHCO₃+0.01 mol/L NaCl solution for X80 pipeline steel after immersion in Ku'erle soil simulation solution for 0~24 h (a) and 24~1008 h (b)

Table 1 Fitting results of cyclic polarization curves

Fig.5 Nyquist plots obtained in 0.5 mol/L NaHCO₃+0.01 mol/L NaCl solution for X80 pipeline steel immersed in Ku'erle soil simulation solution for 0~24 h (a) and 24~1008 h (b)

Fig.6 Equivalent circuit model used to fit the experimental EIS data for X80 pipeline steel without (a) and with (b) corrosion product film

Table 2 Electrochemical parameters obtained by fitting the EIS data

Fig.7 Micrographs of pitting for X80 pipeline steel with corrosion product films for different time after cyclic polarization 0 h (a), 12 h (b) , 24 h (c), 168 h (d), 504 h (e) and 1008 h (f)

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