Formulation of corrosion rate of magnesium alloys using microstructural parameters

Abstract

Up to the date of writing this article, a quantitative analysis between corrosion rate and combined microstructural parameters including composition, grain size, and precipitations has not been reported. Hence, a literature review was carried out on these parameters to understand the quantitative effect of each one on the corrosion rate of Mg and Mg alloys. Moreover, using the available data in the literature and several experimental results, a new model was developed to predict the corrosion rate, through microstructural parameters. This model suggests that by using ultra-fined grains, alloying compounds with low Volta-potential difference relative to the matrix and a low fraction of secondary phase, a very low corrosion rates of materials are achievable. Keywords: Corrosion rate, Magnesium, Grain size, Volta-potential