Controlled release and synergistic effects of polyvinyl alcohol (PVA) on phosphate corrosion inhibitor at the interface of thermal insulation and carbon steel

Purpose – This paper aims to study the controlled release and synergistic effect of water-soluble polyvinyl alcohol (PVA) on phosphate corrosion inhibitor at the interface of thermal insulation cotton/carbon steel. Design/methodology/approach – This study was carried out using a coating method, scanning electron microscopy, energy dispersive spectroscopy and AC impedance. Findings – The single-phase phosphate particles were coated/adsorbed on the PVA film, which was formed on the fiber surface of corrosion inhibitor/PVA-impregnated rock wool sample. On the surface of Q235 steel, an effective protective film was formed by the corrosion inhibitor with partially dissolved PVA that can significantly increase the polarization resistance of corrosion reaction, and reduce the capacitive reactance of electric double layer. The rock wool impregnated with the phosphate corrosion inhibitor and 1.5 per cent PVA showed obvious controlled release and inhibition synergism. Originality/value – The rock wool impregnated w...