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2018•International Journal of Electrochemical ScienceOpen access

Effect of Arsenic Alloying on the Microstructure and Corrosion Properties of Mg-Al Alloy

An Wang, Weitao Jia, Chunlong Cheng, Qichi Le, Fan Yang

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Abstract

We report that arsenic alloying significantly accelerates the corrosion process of Mg-Al alloy. The microstructure of Mg-Al-As alloy consists of α-Mg grains, β-Mg 17 Al 12 particles, and Mg 3 As 2 particles. Gravimetric tests revealed that the average corrosion rates of Mg-Al-As and AZ80 magnesium alloys are 75.48 mm/y and 7.06 mm/y. The acceleration of the corrosion process in Mg-Al-As alloy is mainly attributed to the Mg 3 As 2 phase, which quickly hydrolyzes to form a Mg(OH) 2 film.

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What this paper is about

We report that arsenic alloying significantly accelerates the corrosion process of Mg-Al alloy. The microstructure of Mg-Al-As alloy consists of α-Mg grains, β-Mg 17 Al 12 particles, and Mg 3 As 2 particles. Gravimetric tests revealed that the average corrosion rates of Mg-Al-As and AZ80 magnesium alloys are 75.48 mm/y and 7.06 mm/y. The acceleration of the corrosion process in Mg-Al-As alloy is mainly attributed to the Mg 3 As 2 phase, which quickly hydrolyzes to form a Mg(OH) 2 film.

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Available abstract

We report that arsenic alloying significantly accelerates the corrosion process of Mg-Al alloy. The microstructure of Mg-Al-As alloy consists of α-Mg grains, β-Mg 17 Al 12 particles, and Mg 3 As 2 particles. Gravimetric tests revealed that the average corrosion rates of Mg-Al-As and AZ80 magnesium alloys are 75.48 mm/y and 7.06 mm/y. The acceleration of the corrosion process in Mg-Al-As alloy is mainly attributed to the Mg 3 As 2 phase, which quickly hydrolyzes to form a Mg(OH) 2 film.

Key concepts: Metallurgy, Microstructure, Alloy, Arsenic, Materials science, Corrosion

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