Abstract
The effects of some organic compounds namely formamide, pyridine, gramine, dipyridyl, piperidine, benzoyl piperidine and dibenzyl disulphide on the corrosion of 2S aluminium in 1M sodium hydroxide and 1M hydrochloric acid have been investigated. All the compounds are not effective as inhibitors by themselves in sodium hydroxide solution but their conjoint action with calcium enhances their inhibition efficiency to a great extent. In 1M hydrochloric acid their inhibition efficiency is high and calcium, contrary to its behaviour in sodium hydroxide, does not possess any beneficial effect on the influence of these compounds. The polarization behaviour of aluminium in the acidic and the alkaline solutions in the presence of these compounds is discussed.
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