Effect of Alcohol on the Corrosion of Al Alloys¹ in 1 N H₂SO₄ Solution Part I

A. Buyuksagis^a and A. A. Aksut^b

^a Afyon Kocatepe University, Science and Art Faculty, Afyon,Turkey

^b Ankara University Science Faculty, Ankara, Turkey

e-mail: Этот e-mail защищен от спам-ботов. Для его просмотра в вашем браузере должна быть включена поддержка Java-script

Received March 12, 2007

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 Alalloys. 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, 5hexen–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 adsorp-tion 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 (E_cor) 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.

PACS numbers: 81.65.Kn