This work experimentally evaluates the effects of chemical composition, particularly the amount of silicon on the quality of the applied coating technology of hot dip galvanizing. The experiment is aimed at determining the microstructure, thickness and quality of the zinc layer on the test samples of different steel grades. For the experiment there were selected structural steels S235JR and S355J2 with low silicon content. High strength steel S690QL with higher silicon content was chosen for comparison. Results of independent measurements of coating thickness using optical microscopy and magnetic method indicate only minimal differences between steel S235JR and S355J2. Steel S690QL exhibits thick and uneven layer of the zinc. Steel S690QL should be evaluated as unsatisfactory type of steel for hot-dip galvanizing.Keywords: Zinc Layer, GDOES, Optical Microscopy, Steel S690QL
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