Benzalkonium fluorophosphates: synthesis, thermal and anticorrosive properties

Abstract

The use of ionic liquids containing fluorine for corrosion protection is a promising direction for protecting metals and steel from chemical and biological corrosion. The paper studies the method for the synthesis and properties of benzalkonium fluorophosphates, the production technologies of which were developed at JSC "R&D Center "Applied Chemistry (GIPH)". The production of ionic compounds containing the alkyl dimethyl benzyl ammonium cation (BA, ABDA), and the fluorophosphorus anion is based on the metathesis reaction with the corresponding acid. It was found that the obtained hexafluorophosphate and trisfluorotri(pentafluoroethyl)phosphate of substituted ammonium have a low saturated vapor pressure at high temperatures (up to 250°C). These substances were studied as a corrosion inhibitor 10-5 -2.5 mg/l for low-carbon steel St3 in a 5% hydrochloric acid solution at a temperature of 70°C, it was shown that benzalkonium fluorophosphates significantly increase the protective effect compared to an uninhibited environment.