Effect of Preheating Time on Protective Performance of Fusion Bonded Epoxy Powder Coating on Q345 Steel II: Failure Behavior Analysis of Coating

doi:10.11902/1005.4537.2017.047

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 255-264 DOI: 10.11902/1005.4537.2017.047

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Effect of Preheating Time on Protective Performance of Fusion Bonded Epoxy Powder Coating on Q345 Steel II: Failure Behavior Analysis of Coating

Haijiao CAO^1,², Yinghua WEI¹(

), Hongtao ZHAO¹, Chenxi LV¹, Yaozong MAO¹, Jing LI¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

The effect of substrate preheating time at 210 ℃ on the degradation behavior of fusion bonded epoxy powder coating/Q345 steel system was studied by electrochemical impedance spectroscopy (EIS). The corrosion products of the substrate beneath the coating were characterized by means of scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Results showed that the substrate preheating time had a significant effect on the adhesion of the coating to the substrate, which led to the different corrosion behavior of the metal substrate beneath the coating. The coating exhibited poor bonding performance when the substrate preheating time was less than 2 h, which resulted in the occurrence of premature corrosion of the substrate metal. This might be due to the oxygen enrichment in the interface gap of coating/metal and the cathode reaction was mainly O₂ reduction reaction. In this case, the corrosion of the substrate metal developed rapidly along the depth and the substrate metal was prone to pitting. When the substrate preheating time was 6 and 12 h, the coating showed good bonding performance and the corrosion reaction of the substrate metal beneath the coating happened much later. This could be supposed that the excellent adhesion of the coating made the oxygen deprivation at the interface of coating/metal and iron oxide was reduced in the cathode reaction. The corrosion of the substrate metal developed laterally and the corrosion behavior was closer to be uniform corrosion.

Key words: fusion bonded epoxy powder coating preheating time electrochemical impedance spectroscopy adhesion property corrosion behavior of metal substrate

Received: 27 March 2017

ZTFLH:

TG174.5

Fund: Supported by Strategic Precursor Project A of Science and Technology in Chinese Academy of Sciences(XDA13040500)

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	Haijiao CAO
	Yinghua WEI
	Hongtao ZHAO
	Chenxi LV
	Yaozong MAO
	Jing LI

Cite this article:

Haijiao CAO, Yinghua WEI, Hongtao ZHAO, Chenxi LV, Yaozong MAO, Jing LI. Effect of Preheating Time on Protective Performance of Fusion Bonded Epoxy Powder Coating on Q345 Steel II: Failure Behavior Analysis of Coating. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 255-264.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.047 OR https://www.jcscp.org/EN/Y2018/V38/I3/255

Fig.1 Nyquist plots of the coating/Q345 system with 0 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 0~12 d (a), 27d (b) and 68~218 d (c)

Fig.2 Nyquist plots of the coating/Q345 system with 2 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 0~12 d (a), 27~68 d (b) and 99~218 d (c)

Fig.3 Nyquist plots of the coating/Q345 system with 6 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 0~27 d (a), 48~148 d (b) and 218 d (c)

Fig.4 Nyquist plots of the coating/Q345 system with 12 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 0~27 d (a), 48 d (b) and 99~218 d (c)

Fig.5 Equivalent circuits for the coating/Q345 system during immersion at the early stage (a), middle stage (b) and late stage (c)

Fig.7 Surface macro-morphologies of four coating/Q345 systems after immersion in 3.5%NaCl solution at 60 ℃ for 218 d (a1~a4), steel substrate after immersion and then mechanically removing the coating (b1~b4), steel substrate after immersion, acetone soaking and then mechanically removing the coating (c1~c3) (for the coating systems, the steel substrate was preheated for 0 h (a1, b1), 2 h (a2, b2, c1), 6 h (a3, b3, c2) and 12 h (a4, b4, c3))

Fig.8 Corrosion morphologies of the steel substrate of the coating system with 0 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 218 d (a) and the magnified images of areas I in Fig.8a (b), II in Fig.8a (c) and IV in Fig.8b (d)

Fig.9 EDS analysis results of areas I (a), II (b) and III (c) of the substrate surface in Fig.8a

Fig.10 Corrosion morphologies (a) of the steel substrate of the coating system with 2 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 218 d and the magnified images of areas I in Fig.10a (b), II (c) and III (d) in Fig.10b and EDS analysis result (e) of area II in Fig.10b

Fig.11 Corrosion morphologies (a) of the steel substrate of the coating system with 6 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 218 d and the magnified images of areas I (b) and II (c) in Fig.11a and EDS analysis results of areas III (d) and IV (e)

Fig.12 Corrosion morphologies (a) of the steel substrate of the coating system with 12 h substrate preheating after immersion in 3.5%NaCl solution at 60 ℃ for 218 d and the magnified images of areas I in Fig.12a (b), III in Fig.12b (c) and EDS analysis results of areas II (d) and III (e) in Fig.12b

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