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Journal of Applied Sciences
  Year: 2007 | Volume: 7 | Issue: 2 | Page No.: 237-241
DOI: 10.3923/jas.2007.237.241
 
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The Effects of Zinc Additions on the Corrosion Susceptibility of Aluminium Alloys in Various Tetraoxosulphate (VI) Acid Environments

C.E. Ekuma, N.E. Idenyi and A.E. Umahi

Abstract:
The influence of zinc additions on the corrosion behaviour of aluminium alloys in H2SO4 solution of varying concentrations has been investigated. Aluminium-zinc alloys of 1.0, 2.0, 2.5, 3.5 and 4.0% zinc by weight were cast and machined to cuboidal test coupons of initial surface area averaging 12.71 cm2. The coupons were then weighed and immersed into beakers containing 0.5 M and 1.0 M H2SO4 solutions. The set-ups were allowed to stand for six days with a set withdrawn daily for corrosion rate characterization using standard procedures. The results showed that although, the normal corrosion rate profile (for passivating metals) of an initial steep rise, then a progressive decline was observed in all the media as the fraction of the solute in the alloy increased, there was severity of attack on the 2.5% Zn alloy. It is concluded that the severity of attack on the 2.5% Zn alloy is due to increased grain boundary concentration possibly implying a maximum solid solubility (solvus line) in Al-Zn binary systems within this range.
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How to cite this article:

C.E. Ekuma, N.E. Idenyi and A.E. Umahi , 2007. The Effects of Zinc Additions on the Corrosion Susceptibility of Aluminium Alloys in Various Tetraoxosulphate (VI) Acid Environments. Journal of Applied Sciences, 7: 237-241.

DOI: 10.3923/jas.2007.237.241

URL: https://scialert.net/abstract/?doi=jas.2007.237.241

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