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Open Access Synergistic inhibition behavior of sodium diethyldithiocarbamate and sodium acetate for AZ31B magnesium alloy in NaCl solution

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The inhibition effect of sodium diethyldithiocarbamate (SDDTC) and sodium acetate (NaAc) as green ecofriendly corrosion inhibitor for magnesium (Mg) alloy AZ31B (3wt% aluminum and 1wt% zinc) in 3.5 wt.% NaCl solution was investigated by electrochemical measurements, weight loss measurements, scanning electron microscopy (SEM) and fourier transformation infrared spectroscopy (FTIR). Results reveal that the combined addition of SDDTC or NaAc can synergistically inhibit the corrosion of Mg alloy AZ31B and an optimal inhibition efficiency in terms of corrosion of AZ31B substrate was yielded in 3.5 wt% NaCl electrolyte containing 0.3 × 10–3 mol L–1 SDDTC and 0.15 mol L–1 NaAc. Surface analysis results suggest the corrosion inhibition ability of SDDTC and NaAc in the naturally corrosion system could be attributed to the formation of a compact protective film. The corrosion inhibition efficiency of the combined addition was predominantly because of SDDTC would chelate with Mg via their N atoms to form the SDDTC-Mg and NaAc-Mg complexes deposits at the active electrochemical corrosion sites to reduces the porosity of the original Mg(OH)2 surface film and inhibits the anodic dissolution of AZ31B alloy.

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Keywords: CORROSION; ELECTROCHEMICAL MEASUREMENTS; INHIBITOR; MAGNESIUM ALLOY; NACL SOLUTION

Document Type: Research Article

Publication date: February 1, 2019

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