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The corrosion performance of Zn-Al-Mg based alloys with tin addition in neutral salt spray environment

Gondek J., Babinec M., Kusý M.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 70, nr 2

70--77

Purpose: Ternary Zn-Al-Mg system was modified with 0.5, 1.0, 2.0 and 3.0 wt. % of Sn in order to study its microstructure, phase composition and corrosion performance in neutral salt spray test. Addition of tin was devised to modify phase composition and phase quantities, particularly Zn2Mg intermetallic phase. Design/methodology/approach: Ternary and quaternary alloys were prepared from 4N purity elements under a flux layer. Chemical composition was verified using optical emission spectrometer. Light and scanning electron microscopy was used to study microstructure further complemented with local chemical analysis using energy dispersive X-ray spectrometry. Phase composition and phase quantity of as-cast samples and samples after corrosion tests were determined using X-ray diffraction. Performance of alloys in neutral salt spray test was evaluated by method of weight change. Findings: Addition of Sn caused change in solidification mechanism which influenced also phase composition and phase quantity. Typical weight loss was determined after exposure of ternary system in salt spray chamber. Contrary, weight gain was observed in all four tin alloyed ternary systems. This finding was explained by blister formation. Research limitations/implications:Results introduced in this paper are limited to relatively slowly cooled coarse-grained samples. Different cooling rates may affect phase composition and also corrosion performance. Practical implications: Paper shows alternative way of changing phase composition of ternary Zn-Al-Mg system by alloying using tin. Change in phase composition may have, however, impact on corrosion performance as it is shown in this paper. Originality/value: Paper describes change of the corrosion mechanism when ternary Zn-Al-Mg system is alloyed with Sn. It also shows that blister formation found in quaternary system depends on grain orientation with respect to the exposed surface.