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

authors	Maltseva, A; Lamaka, SV; Yasakau, KA; Mei, D; Kurchavov, D; Zheludkevich, ML; Lefevre, G; Volovitch, P
nationality	International
journal	CORROSION SCIENCE
author keywords	Mg; In situ Raman spectroscopy; Glow discharge optical emission spectroscopy; ATR-FTIR; Organic inhibitors; Surface film
keywords	RELATIVE INTENSITY CHANGES; COORDINATION POLYMERS; MAGNESIUM ALLOY; POSITIONAL FLUCTUATION; SALICYLATE INTERACTION; FREQUENCY-SHIFT; ANODE MATERIALS; MILD-STEEL; INHIBITION; ACIDS
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.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0010-938X
isbn	1879-0496
year published	2020
volume	171
digital object identifier (doi)	10.1016/j.corsci.2020.108484
web of science category	Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category	Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000537624600004