Interface Chemical Bonded Anticorrosion Coatings of Prepared by Thermal Field-Assisted Mechanochemistry

doi:10.12068/j.issn.1005-3026.2025.20240214

Abstract

Abstract:

The interfacial compatibility of fillers/resins in coating systems is the key to improving the protection performance of coatings. Mica fillers commonly used in organic anticorrosive coatings were first processed， and mica-epoxy resin modified fillers were prepared by mechanochemistry methods under the auxiliary conditions of normal temperatures and different temperature thermal fields. The feasibility of interfacial chemical bonding between fillers and coatings was evaluated by Fourier transform infrared spectroscopy （FTIR） and thermogravimetric analysis（TGA）. The results show that thermal field-assisted mechanochemistry can realize the chemical reaction between resin and mica， which is difficult to proceed under normal conditions. The corrosion resistance test proves that the epoxy coating with modified mica has better corrosion resistance， and the action mechanism of modified mica filler on the coating is discussed， which provides a theoretical basis for the study of thermal field-assisted mechanochemical control of the corrosion resistance of epoxy coating.

Key words: anticorrosive coating, interfacial chemical bonding, epoxy resin, mica, thermal field-assisted mechanochemistry

CLC Number:

TG 174.4

Fan-di MENG, Xin-yu WAN, Ya-hui CAI, Li LIU. Interface Chemical Bonded Anticorrosion Coatings of Prepared by Thermal Field-Assisted Mechanochemistry[J]. Journal of Northeastern University(Natural Science), 2025, 46(8): 113-123.

Figures/Tables 15

Table 1 Chemical composition of Q235 steel

C	Si	Mn	P	S	Fe
0.17	0.35	1.40	0.012	0.015	余量

Fig.1 Structure of heatable ball mill

Fig.2 Powder characterization results of untreated mica and mechanochemically treated mica at different rotational speeds at room temperature

Fig.3 Characterization results of untreated mica and heated mica at different temperatures

Fig.4 Characterization results of mica treated by thermal field-assisted mechanochemistry

Fig.5 TEM images of mica filler

Fig.6 XPS results of untreated mica power

Fig.7 XPS spectra of mica power treated by thermal field-assisted mechanochemistry at 160 °C and 600 r/min

Fig.8 Mica particle size distribution curves under different processing conditions

Fig.9 Schematic diagram of chemical reaction of grafting epoxy on surface of mica

Fig.10 Water absorption curves of mica/epoxy film in 3.5% NaCl solution

Fig.11 Bode plots of electrochemical impedance spectra of coatings with different immersion times

Fig.12 Surface morphology of mica/epoxy coating before and after modification after immersion in 3.5% NaCl solution for 3 840 h

Fig.13 SEM images of cross-section of mica/epoxy coating in service

Fig.14 Corrosion protection principle of mica/epoxy coating on metal substrates

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