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

resumo

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.

palavras-chave

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

categoria

Materials Science; Metallurgy & Metallurgical Engineering

autores

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

nossos autores

agradecimentos

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.

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".