期刊
CORROSION SCIENCE
卷 153, 期 -, 页码 272-282出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.03.024
关键词
Magnesium; Brucite; In-situ Raman spectroscopy; Aqueous corrosion; Surface film evolution
Mg(OH)(2) films evolution at initial stages of Mg aqueous corrosion was studied by in-situ Raman spectroscopy adapted for kinetic Raman mapping (KRM). Crystalline Mg(OH)(2) (brucite) formed in situ from the first minutes of reaction. KRM evidenced a threshold-like Mg(OH)(2) growth kinetics for areas where black filaments were later formed, linear kinetics for visually intact areas at pH 9-10 and parabolic law for intact areas at pH > 11. The Mg(OH)(2) morphology expected from in-situ Raman scattering of surface OH groups correlated well with ex-situ microscopic observations. A dissolution-precipitation model of Mg(OH)(2) layer evolution was applied to explain the experimental observations.
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