Effect of alcohol on the corrosion of al alloys in 1 N H2SO4 solution Part I

Abstract

The aim of this paper is to examine the effects of alcohol (1-buten-3-ol-l, 2-methyl-3-butyn-2-ol, 3-methyl-2-buten-1-ol, 3-methyl-3-buten-1-ol, 3-methyl-1-pentyn-3-ol, 5-hexen-1-ol) on the corrosion of Al alloys. The inhibiting effect of alcohol was investigated by electrochemical current-potential curves, atomic absorption spectrometry (AAS), metal microscopy,SEM and EDS. The results showed that alcohol (1-buten-3-ol, 2-methyl-3-butyn-2-ol, 3-methyl-2-buten-1-ol, 3-methyl-3-buten-1-ol, 3-methyl-1-pentyn-3-ol, 5-hexen-1-ol) had an inhibiting effect on the corrosion of aluminium alloys. Experimental results show that corrosion of alloys in H2SO4 solution have been effected by elements in alloys such as Cu, Zn, Mg and adsorption of alcohol on the surface of alloys in H2SO4 solution obeys Temkin adsorption isotherm. The use of alcohol in H2SO4 solution were shifted corrosion potentials (Ecor) to more negative values and acted as cathodic inhibitors on the aluminum alloys. EDS analysis of alloys displayed different intermetallic compounds on the surface of alloys, which might have changed the activity of alcohols depending on the surface morphology of alloys. This paper has showed that these alcohol inhibited corrosion of aluminium alloys in H2SO4 solution. The concentration of 20 mM alcohol was shown that above 90% inhibition was achieved, which is a rather high value.