In situ surface film evolution during Mg aqueous corrosion in presence of selected carboxylates

abstract

Mechanisms of inhibition of Mg aqueous corrosion in presence of chloride by sodium salicylate (Sal), 2,5-pyridinedicarboxylate (PDC) and fumarate (Fum) were studied by in situ Raman spectroscopy, ATR-FTIR, GD-OES and hydrogen collection. In situ detected surface films were composed by Mg(OH)(2) nano-crystals and included inhibitors. All carboxylates significantly modified Mg(OH)(2) growth kinetics as well as pevented chloride incorporation in the film. Vibrational spectra of the surface films demonstrated specific interactions between the carboxylates and the surface: adsorption of Sal and Fum on the oxide/hydroxide, precipitation of coordination polymer by PDC, dissolution of iron inclusions via formation of iron-Sal soluble complexes.

keywords

RELATIVE INTENSITY CHANGES; COORDINATION POLYMERS; MAGNESIUM ALLOY; POSITIONAL FLUCTUATION; SALICYLATE INTERACTION; FREQUENCY-SHIFT; ANODE MATERIALS; MILD-STEEL; INHIBITION; ACIDS

subject category

Materials Science; Metallurgy & Metallurgical Engineering

authors

Maltseva, A; Lamaka, SV; Yasakau, KA; Mei, D; Kurchavov, D; Zheludkevich, ML; Lefevre, G; Volovitch, P

our authors

acknowledgements

KY thanks Researcher grant (IF/01284/2015) and Project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES and co-financed by FEDER under the PT2020 Partnership Agreement.

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