*Article* **The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour**

**Zuzana Gabalcová \*, Peter Gogola, Martin Kusý and Henrich Suchánek**

Faculty of Materials Science and Technology in Trnava, Institute of Materials Science, Slovak University of Technology in Bratislava, Ulica Jána Bottu 25, 917 24 Trnava, Slovakia; peter.gogola@stuba.sk (P.G.); martin.kusy@stuba.sk (M.K.); henrich.suchanek@stuba.sk (H.S.)

**\*** Correspondence: zuzana.gabalcova@stuba.sk

**Abstract:** Corrosion behaviour of Sn (0.0, 0.5, 1.0, 2.0 and 3.0 wt.%)-doped Zn 1.6 wt.% Al 1.6 wt.% Mg alloys exposed to salt spray testing was investigated. Intergranular corrosion was observed for all alloys in both as-cast and annealed states. However, due to microstructure spheroidisation in the annealed samples, potential intergranular corrosion paths are significantly reduced. Samples with 0.5 wt.% of Sn showed the best corrosion properties. The main corrosion products identified by XRD analysis for all samples were simonkolleite and hydrozincite. Occasionally, ZnO and AlO were identified in limited amounts.

**Keywords:** Zn-based alloy; Sn-addition; corrosion products; salt spray test; intergranular corrosion; corrosion penetration depth; weight loss
