| Metals are the one of most essential materials used in modern society, whilecorrosion occurring everywhere and at any time can dramatically deteriorate metal’sperformance and cause tremendous economic loss. Organic coatings are the most usedprotective measure in industry due to their convenient engineering process, easypreparation and economical efficiency. Vinyl ester resin (VER) is a promising resin tobe used as the protective coating because of its low weight, cost effective, goodchemical and weather resistance. But, attributed to its high brittleness and lowadhesion, there are scarcely reports on VER used as the corrosion protective coating.Polyaniline (PANI), an inherent conducting polymer, owning the distinctiveanti-pitting, anti-scratching and passivation properties, is widely employed as thecorrosion protective coating. It’s of great theoretical and practical significance toexplore the VER coating and develop a high performance PANI/VER corrosionprotective coating.Here, methyl ethyl ketone peroxide (MEKP) applied as the curing agent, cobaltnaphthenate employed as the curing promoter, VER was cured at room temperature tofabricate VER coating. Ultraviolet-visible spectrophotometric method was used tocharacterize the hydrolytic performance of VER in12.0%NaCl solution at100oC.The experimental results indicate that the hydrolysis of the coating is not the mainreason for the VER coating failure. The electrochemical impedance spectroscope (EIS)and equivalent electrical circuit (EEC) model were employed to evaluate the corrosionprotective performance of the VER coating. The VER coating had efficient corrosionprotection for17days in12.0%NaCl solution at100oC. Furthermore, KH550wasused as the additive to improve the adhesion of the VER coating, and the adhesionvalue of the VER coating with2.5%KH550was as high as5.64MPa. Lauryl acrylate(LA) was used to improve the toughness of the VER coating, and the VER coatingwith2.0%LA could keep the effective corrosion protection for34days.To improve the corrosion protection of the VER coating, PANI nanomaterialswere added to fabricate PANI/VER coatings. The contact angle test and drop impact test were used to characterize the hydrophilic/hydrophobic property and impactstrength of PANI/VER coatings, respectively. LA and KH550were also used as theadditives of the PANI/VER coating to improve the mechanical property. Thecorrosion protection test of the prepared coatings indicates that the VER coatingcontaining2.0%PANI and2.0%LA can maintain effective for37days, which has thebest corrosion protection in this paper. |
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