The inhibitory action of ethanolthiol, 2-mercaptoethanol and dodecyl mercaptan towards the corrosion of copper (99·8 %) in 0·1 M monochloracetic acid has been investigated. The inhibitive efficiency of these compounds may be arranged in the following order: dodecyl mercaptan > 2-mercaptoethanol > ethanolthiol. Polarisation measurements indicated that the compounds were principally cathodic corrosion inhibitors. I.R. spectra of the protective film formed on copper in solution inhibited with 2-mercaptoethanol, and of the pure chelate synthesised from 2-mercaptoethanol and copper ions in solution, were found to be identical.

Ethanolthiol, 2-mercaptoethanol, and dodecyl mercaptan effectively inhibit copper corrosion in monochloracetic acid solution, with dodecyl mercaptan being the most effective cathodic corrosion inhibitor.

Paper

Inhibition by some Thiocompounds of the Corrosion of Copper in Monochloracetic Acid Solution

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