Degradation Behavior of Fusion Bonded Epoxy Powder Coating on Q235 Carbon Steel in 1.5 mol/L NaCl Solution

doi:10.11902/1005.4537.2013.132

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (4): 382-388 DOI: 10.11902/1005.4537.2013.132

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Degradation Behavior of Fusion Bonded Epoxy Powder Coating on Q235 Carbon Steel in 1.5 mol/L NaCl Solution

YANG Hai, LU Weizhong, LI Jing, SUN Chao

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract The degradation behavior of two kind of fusion bonded epoxy coatings on Q235 carbon steel in 1.5 mol/L NaCl solution was investigated by electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). The results showed that corrosive species (Cl^- etc) could penetrate through the coating and then arrive at the interface of coating/Q235 carbon steel ,which then induced corrosion reaction there, resulting corrosion products composed mainly of iron oxide and iron chloride. Finally a three step process was proposed to describe the electrochemical process of the coating degradation.

Key words: epoxy powder coating NaCl solution degradation behavior

Received: 14 August 2013

ZTFLH:

TG174.5

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YANG Hai, LU Weizhong, LI Jing, SUN Chao. Degradation Behavior of Fusion Bonded Epoxy Powder Coating on Q235 Carbon Steel in 1.5 mol/L NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(4): 382-388.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.132 OR https://www.jcscp.org/EN/Y2014/V34/I4/382

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