EFFECT OF INHIBITORY COMPOSITION BASED ON DEXTRIN AND ZINC GLUCONATE ON TRIBOCORROSION OF ALUMINIUM ALLOY

Abstract

The effect of an environmentally safe inhibitory composition based on dextrin and zinc gluconate on corrosion and tribocorrosion of an aluminium alloy in a chloride-containing solution was studied. Charge transfer resistance of the aluminium alloy in the solution inhibited by the composition with optimal component ratio increases significantly and electric double layer capacitance decreases compared to uninhibited 0.1% NaCl, which indicates a significant improvement of metal corrosion resistance. The frequency dependence of phase angle indicates the formation of an organic protective film on the surface of the aluminium alloy in the chloride solution inhibited by the composition. A decrease in the coefficient of friction of the aluminium alloy/corundum pair in an inhibited chloride-containing solution was established. The inhibitor composition significantly reduces the polarization current of the aluminium alloy under conditions of tribocorrosion. Optical 3D profilometry revealed more uniform and less surface wear of the aluminium alloy in the inhibited solution.