Czasopismo | OCHRONA PRZED KOROZJĄ | Rocznik 2013 - zeszyt 10

Corrosion resistance of coatings obtained in a Zn+23Al bath with Mg additions

nr katalogowy: 79751

The results of corrosion resistance tests on coatings obtained in zincaluminium baths with the addition of Mg are presented. The content of Al in the bath was 23%, while the content of magnesium was 3% and 6%. In order to defi ne corrosion resistance, two standard corrosion tests were performed in neutral salt spray and in moist atmosphere containing sulphur dioxide. Corrosion resistance of tested pieces was compared with the corrosion resistance of a traditional zinc coating. It was established that ZnAl23-Mg coatings have very good corrosion resistance in the tested environments, better than that of zinc coatings. Keywords: hot dip galvanizing, ZnAlMg coatings, corrosion resistance.1. Introduction Zinc-aluminium coatings provide effective protection against corrosion. They are produced by continuous method on steel plates in baths containing 5% and 55% of Al. The development of the continuous method lead to elaborating new bath compositions, including zinc-aluminium baths containing Mg. Initially, magnesium was introduced to limit the tendency for intercrystalline corrosion induced by the effect of Pb and Sn. Research on the production of coatings in the Super Zinc (ZnAl4.5Mg0.1) bath showed that the presence of Mg enhances corrosion resistance of the coating [1]. After developing the Super Dyma bath it was established that changes in Al contents from 5% to 11% improved corrosion resistance only slightly. However, considerable growth of corrosion resistance was induced by the addition of 3% of Mg [2]. The favourable infl uence of Mg upon corrosion resistance was also confi rmed in tests on coatings obtained in Dymazinc (ZnAl0.2Mg0.5) and ZAM (ZnAl6Mg3) baths [3]. Even though the corrosion resistance of zinc-aluminium coatings obtained on metal plates is very good, Zn-Al baths are not used to produce coatings on products of a specifi c shape. The infl uence of Mg and its synergistic effect with large additions of Al[...]

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