Mass preparation and anticorrosion mechanism of highly triple-effective corrosion inhibition performance for co-modified zinc phosphate-based pigments

Abstract

The benzotriazole and GO co-modified zinc phosphate (ZP/BTA/GO) pigments with chemically oriented laminated structure are synthesized massively by in situ self-heating method for the first time. The heat released from the formation of ZP increases the solubility of BTA achieving the self-sufficiency of system energy in one step. After modification by BTA, the anticorrosive blind region of ZP pigments in the initial corrosion stage is repaired. With the co-modification by BTA and GO, the strong interaction among ZP, BTA and GO makes the compact laminated structure of ZP/BTA/GO pigments more stable, exerting bidirectional shielding effect on the penetration of corrosive medium. Meanwhile, the electrochemical impedance spectroscopy (EIS) and polarization curve tests reveal that the anticorrosion performance of ZP/BTA/GO pigments is increased by 366.1% compared to ZP pigments. The remarkable improvement of corrosion inhibition is attributed to the synergistic complementary anticorrosion mechanism containing the extension of electrons transport path, the deviation of electrons transfer and the formation of diversified passive films. The formation of zinc phosphate-based laminated pigments with full-covered anticorrosion time and excellent corrosion inhibition performance promotes the industrial production and development of anticorrosion materials.