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The inhibitive effect of (crude) waste glycerol from biodiesel manufacturing process on the corrosion behavior of steel was investigated. The inhibitory effects were studied on steel in 0.5 N hydrochloric acid solutions, using a weight loss method, and Scanning Electron Microscopy (SEM) techniques. The inhibition effect was studied by varying concentrations of inhibitors (0.1, 0.3, 0.5, 0.8, and 1.0%) by weight of solution. The corrosion of steel was inhibited continuously with the amount of inhibitor added. It reached to very high level of inhibition with 0.8 and 1% of inhibitor concentration. The adsorption isotherm models were applied and it is shown that the adsorption of inhibitor layer followed Langmuir isotherm model. The Scanning Electron Microscopy showed that the inhibitor is covering the surface of the metal so that it prevents the metal surface to be in contact with the acid medium.

Waste Glycerol as New Green Inhibition for Metal Corrosion in Acid Medium