Comparative Analysis of Corrosion Inhibition Properties of Allium Cepa Extract on Mild Steel and Zinc

Abstract

Investigation into corrosion efficiency of Allium cepa extract on the corrosion of mild steel and zinc in 2.0M H₂SO₄ solution was carried out.

The effectiveness of using Allium cepa extracts as corrosion inhibitor was characterized in terns of metal weight loss, corrosion rate and inhibition efficiency. The results showed that as the concentration of Allium cepa extract increases the  rate of corrosion of the two metals decreases. The inhibition efficiency was also found to increase with increase in concentration of the extract. The inhibition efficiency increases up to a maximum of 97.7% for mild steel and 89.1% for zinc in 2.0M H₂SO₄ which was encouraging. The results confirmed that  Allium  cepa extract  could serve   as a good corrosion  inhibitor for both metals  in acidic media.

Key words: Corrosion, Allium cepa, inhibitors, extract.