Three Gemini cationic surfactants named N 1 , N 1 , N 3 , N 3 -tetramethyl- N 1 , N 3 -bis(3-octanamidopropyl) propane-1,3-diaminium bromide (C8-S3-C8), N 1 , N 1 , N 3 , N 3 -tetramethyl- N 1 , N 3 -bis(3-dodecanamidopropyl) propane-1,3-diaminium bromide (C12-S3-C12) and N 1 , N 1 , N 3 , N 3 -tetramethyl- N 1 , N 3 -bis(3-hexadecanamidopropyl) propane-1,3-diaminium bromide (C16-S3-C16) were evaluated as corrosion inhibitors for mild steel in 1.0 M HCl. The corrosion rate of mild steel in 1.0 M HCl at three different temperatures 25, 45 and 60oC was investigated gravimetrically. The corrosion rate of mild steel was confirmed electrically at 25oC. The corrosion inhibition efficiency directly proportionally with the hydrophobic chain length of inhibitors. The inhibition efficiency exhibit a positive trend with raising the solution temperatures. The potentiostatic polarization study revealed that the tested gemini cationic surfactants act as mixed type inhibitors with predominant control of cathodic reaction. The Villamil isotherm provide the best describing of the adsorption process on the selected steel in 1.0 M HCl. The adsorption of the tested inhibitors on the steel surface is a mixture of chemical and physical adsorption.
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Aiad et al. (2017) studied this question.