Effect of corrosion inhibiting compounds on the corrosion behaviour of pure magnesium and the magnesium alloys EV31A, WE43B and ZE41A

Abstract

This paper studied corrosion of pure Mg and the Mg alloys EV31A, WE43B, ZE41A, coated with commercial corrosion inhibiting compounds (CICs) (LPS 3, LPS2, AMLGuard, Ardrox 3961) immersed in 3.5 wt% (0.6 M) NaCl solution saturated with Mg(OH)2. All four CICs reduced corrosion rates. LPS 3 resulted in zero corrosion rates and 100% inhibition in most cases. LPS 2 and AMLGuard had comparable inhibition efficiencies, whilst Ardrox 3961 had the lowest inhibition efficiency. Reduction in corrosion rates was tentatively attributed to barrier films formed by chemical adsorption for LPS 3 and AMLGuard, and by physical adsorption for LPS2 and Ardrox 3961.