Effect of Preheating Time on Protective Performance of Fusion Bonded Epoxy Powder Coating on Q345 SteelI: Analysis of Interface Bonding

doi:10.11902/1005.4537.2017.046

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (2): 124-132 DOI: 10.11902/1005.4537.2017.046

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Effect of Preheating Time on Protective Performance of Fusion Bonded Epoxy Powder Coating on Q345 SteelI: Analysis of Interface Bonding

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 on the interface bonding of fusion bonded epoxy powder coating/Q345 substrate was investigated by means of tensile test and wet adhesion test. Results showed that the preheating time presents significant effect on the interface bonding of coating/Q345 substrate, and among others, the best bonding performance could be acquired for the substrate being preheated for 6 h at 210 ℃. The surface morphology, roughness and chemical composition of the substrate were characterized by CLSM, AFM, XPS, and the correlation between the surface state of the substrate and the bonding performance of coating/substrate was inquired into. Results revealed that the preheating treatment resulted in the formation of a dense oxide scale on the surface of Q345 substrate, which composed of an outer layer Fe₂O₃ and an inner layer Fe₃O₄. With the prolonging preheating time, the thickness of Fe₂O₃ layer was almost the same and the inner layer Fe₃O₄ became thicker, whilst the surface roughness of the substrate changed gradually. The change of the surface roughness of the substrate affected the bonding performance of the coating/substrate system.

Key words: fusion bonded epoxy powder coating preheating time bonding performance surface state of substrate

Received: 27 March 2017

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
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	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 SteelI: Analysis of Interface Bonding. Journal of Chinese Society for Corrosion and protection, 2018, 38(2): 124-132.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.046 OR https://www.jcscp.org/EN/Y2018/V38/I2/124

Fig.1 Adhesion strengths of the FBE coating on Q345 steel preheated at 210 ℃ for different time

Fig.2 Tensile fracture morphologies of the FBE coating on Q345 steel after preheating for 0 h (a), 2 h (b), 6 h (c) and 12 h (d)

Fig.3 Wet adhesion grades of the FBE coating on Q345 steel with different preheating time after immersion in 90 ℃ distilled water for different time

Fig.4 Stripping morphologies of the FBE coating on Q345 steel with preheating for 0 h (a), 2 h (b), 6 h (c) and 12 h (d) after immersion in 90 ℃ distilled water for 1 d

Fig.5 Stripping morphologies of the FBE coating on Q345 steel with preheating for 0 h (a), 2 h (b), 6 h (c) and 12 h (d) after immersion in 90 ℃ distilled water for 4 d

Fig.6 CLSM two-dimensional (a1~d1) and three-dimensional (a2~d2) topographies of the FBE coating on Q345 steel with preheating for 0 h (a1, a2), 2 h (b1, b2), 6 h (c1, c2) and 12 h (d1, d2) after immersion in 90 ℃ distilled water for 5 d

Fig.7 XPS full spectra of Q345 steel preheated at 210 ℃ for 12 h after Ar⁺ sputtering for 10 s

Fig.8 XPS spectra of Fe2p on the surface of Q345 steel with preheating for 0 h (a), 2 h (b), 6 h (c) and 12 h (d) after Ar⁺ sputtering for different time

Fig.9 XPS depth profiles of Fe and O on Q345 steel preheated for different time

Fig.10 Camera macro (a1~a4) and CLSM (b1~b4) topographies of Q345 steel after preheating for 0 h (a1, b1), 2 h (a2, b2), 6 h (a3, b3) and 12 h (a4, b4)

Fig.11 Surface roughness of Q345 steel vs preheating time at 210 ℃

Fig.12 Schematic diagrams of the oxidation process of Q345 steel in air at 210 ℃

Fig.13 AFM three-dimensional (a1~e1) and two-dimensional (a2~e2) images of Q345 steel before (a1, a2) and after preheating at 210 ℃ for 0 h (b1, b2) 2 h (c1, c2), 6 h (d1, d2) and 12 h (e1, e2)

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[1]	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[J]. 中国腐蚀与防护学报, 2018, 38(3): 255-264.

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