Abstract

Zn-Al dip coatings provide effective protection of steel surface against corrosion - better than traditional zinc coatings. Corrosion resistance can be further increased by adding Mg to the bath. Coatings obtained in Zn-Al-Mg baths are produced on metal plates by applying the continuous method. In this paper the author presents the results of tests on obtaining Zn-Al-Mg coatings on products with limited shape by use of the batch hot dip method. The growth kinetics of coatings obtained in the Zn-31Al-3Mg bath on steel with low silicon contents has been defined. The structure has been developed and the chemical composition of particular structural components of the coating has be established. It has been determined that the structure of coatings obtained in the Zn-31Al-3Mg bath is continuous. The course of reaction between the tested steel and liquid Zn-31Al-3Mg alloy is very abrupt, which leads to the formation of coatings with excess and non-uniform thickness.

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