Preparation of Sb-C / polyurethane Composite Coating and Its Corrosion Resistance Performance

HE Zhongyi, TIAN Yuqin, ZHANG Renhui, XIONG Liping, LI Qiang

China Surface Engineering ›› 2022, Vol. 35 ›› Issue (2) : 63-69.

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China Surface Engineering ›› 2022, Vol. 35 ›› Issue (2) : 63-69. DOI: 10.11933/j.issn.1007-9289.20210615001

Preparation of Sb-C / polyurethane Composite Coating and Its Corrosion Resistance Performance

  • HE Zhongyi, TIAN Yuqin, ZHANG Renhui, XIONG Liping, LI Qiang
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Abstract

H62 brass is often used as the heat exchange material for condenser due to its good process performance and thermal conductivity, however, which is easily corroded during application. In order to further improve the anticorrosion performance of H62 brass, Sb-C nanomaterial is fabricated by using electrochemical exfoliation method, Sb-C/polyurethane composite paint is fabricated by mixture of Sb-C composite and polyurethane, the Sb-C/ polyurethane composite coating is fabricated on H62 brass surface by using Sb-C/polyurethane composite paint, and the surface and interface morphologies and anticorrosion performance of the coating are performed by using scanning electron microscope (SEM), electrochemical station and immersion method. The results exhibit that compared to the polyurethane coating, the Sb-C/ polyurethane composite coating shows more positive potential (?0.209 V), high impedance modulus and coating resistance (~7.0 kΩ·cm2 ). Furthermore, no obvious corrosion is observed at the Cu substrate, revealing the outstanding corrosion resistance. It is attributed to that Sb-C nanomaterial can effectively reduce the porosity and prohibit the penetration of the corrosive medium, which is conducive to enhancing the corrosion resistance. The organic-inorganic mixed electrolytes (ethylene glycol and sodium sulphate) is first innovatively used to fabricate water-solubility Sb-C nanomaterials, which can be evenly dispersed in water-solubility polyurethane and play an important role in sealing and barrier for polyurethane coating, giving a necessary reference for further investigating the anti-corrosion of H62 brass.

Key words

spray; composite coating; exfoliation; microstructure; anticorrosion property

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HE Zhongyi, TIAN Yuqin, ZHANG Renhui, XIONG Liping, LI Qiang. Preparation of Sb-C / polyurethane Composite Coating and Its Corrosion Resistance Performance[J]. China Surface Engineering, 2022, 35(2): 63-69 https://doi.org/10.11933/j.issn.1007-9289.20210615001

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Funding

Supported by National Natural Science Foundation of China (51965020).
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