Electrochemical properties of anticorrosive coatings based on organosilicate composition in combination with corrosion inhibitors

Abstract

The article considers the effect of atmospheric corrosion inhibitors “NOTEH”, “N-M-1”, “FMT” and phosphating primer VL-02 on the electrochemical properties of anticorrosive coatings based on a new modification of the organosilicate composition — brand OS-51-03M. For corrosion tests using the method of potentiodynamic polarization, carbon steel plates of the St3sp5 brand were used, on which coatings were applied by the paint and varnish method. It was revealed that the aqueous phosphating composition “NOTEH” and the corrosion inhibitor “N-M-1” significantly increase the corrosion resistance of organosilicate coatings in an aggressive environment — 3 % NaCl solution. For these coatings, it is impossible to register the current and corrosion potential after 1 month of exposure of coatings in a corrosive environment. Under similar measurement conditions, the electrochemical parameters of steel plates with unmodified organosilicate coating were recorded — the corrosion current density and corrosion potential were equal to 8·10-9A/m2 and –144 mV, respectively. It was revealed that the phosphating primer VL-02 has a negligible effect on increasing the duration of anticorrosive protection of the organosilicate coating system. The type of inhibitory protection of atmospheric corrosion inhibitors has been determined.