Epoxy/Organosiloxane Modified Cationic Acrylic Emulsion Composite Coating

doi:10.11902/1005.4537.2022.279

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 922-928 DOI: 10.11902/1005.4537.2022.279

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Epoxy/Organosiloxane Modified Cationic Acrylic Emulsion Composite Coating

ZOU Wenjie, DING Li, ZHANG Xuejiao, CHEN Jun(

)

School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243002, China

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Abstract

Based on the principle that the amine group in the synthesized organosiloxane-modified cationic acrylic (SMCWA) latex can cure epoxy resin, the corrosion-resistant epoxy resin/SMCWA latex composite coating were prepared on the surface of carbon steel plate. The SMCWA latex was characterized by laser nanometer particle size analyzer. The structure and morphology of the composite coatings were analyzed by FT-IR and SEM. The corrosion resistance of the composite coating was studied by copper sulfate spot test, electrochemical test and neutral salt spray test. The results show that the synthesized stable SMCWA latex has small particle size and uniform particle size distribution. Compared with the blank SMCWA latex coating, the compactness and corrosion resistance of the epoxy resin/SMCWA latex composite coating have been greatly enhanced. When the composite coating prepared with the mass ratio of epoxy resin to SMCWA is 9.5/0.5, as a result, the life-time of copper sulfate corrosion resistance is increased by 116 s; the AC impedance is increased by 4 times, and the corrosion current density is decreased by an order of magnitude in 3.5%NaCl; and the neutral salt spray resistance is also greatly enhanced for the prepared composite coating.

Key words: carbon steel plate organosiloxane modification cationic acrylic emulsion epoxy resin corrosion resistance

Received: 09 September 2022 32134.14.1005.4537.2022.279

ZTFLH:

TQ174.4

Fund: National Natural Science Foundation of China(U1460106)

Corresponding Authors: CHEN Jun, E-mail: junchen@ahut.edu.cn

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Cite this article:

ZOU Wenjie, DING Li, ZHANG Xuejiao, CHEN Jun. Epoxy/Organosiloxane Modified Cationic Acrylic Emulsion Composite Coating. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 922-928.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.279 OR https://www.jcscp.org/EN/Y2023/V43/I4/922

Fig.1 Size and distribution of latex particles in SMCWA emulsion

Fig.2 Zeta potential of latex particles in SMCWA emulsion

Fig.3 FT-IR spectra of SMCWA emulsion and epoxy resin before and after curing

Fig.4 SEM images of composite coatings with SMCWA emulsion/epoxy ratios of 10/0 (a), 9/1 (b), 9.25/0.75 (c) and 9.5/0.5 (d)

Fig.5 Water contact angle diagrams of composite coatings with SMCWA emulsion/epoxy ratios of 10/0 (a), 9/1 (b), 9.25/0.75 (c), 9.5/0.5 (d) and 9.75/0.25 (e)

Fig.6 Adhesion charts of composite coatings with SMCWA emulsion/epoxy ratios of 10/0 (a), 9/1 (b), 9.25/0.75 (c), 9.5/0.5 (d) and 9.75/0.25 (e)

Fig.7 Bode (a, b) and Nyquist (c) diagrams of composite coatings with different SMCWA emulsion/epoxy ratios

Fig.8 Equivalent circuit diagram for fitting of EIS of SMCWA emulsion/epoxy composite coating

Table 1 Fitting parameters of EIS of composite coatings with different SMCWA emulsion/epoxy ratios

Fig.9 Tafel polarization curves of composite coatings with different SMCWA emulsion/epoxy ratios

Table 2 Corrosion parameters of composite coatings with different SMCWA emulsion/epoxy ratios

Fig.10 Surface morphologies of SMCWA emulsion coating (a-c) and SMCWA emulsion /epoxy composite coating with the ratio of 9.5/0.5 (d-f) after neutral salt spray test for 0 h (a, d), 8 h (b, e) and 24 h (c, f)

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