SKOTNICKI Wojciech University of Technology and Humanities

Spoluautoři JĘDRZEJCZYK Dariusz, SZŁAPA Ilona, HAJDUGA Maciej, WĘGRZYNKIEWICZ Sylwia

This paper tries to determine the possibilities of application of the high temperature oxidation of cast iron as a way of surface preparation before hot-dip zinc galvanizing and presents also results of corrosion resistance tests of zinc coatings created after high temperature oxidation of grey cast iron (with flake graphite). Research was focused on elements of overhead power lines – the jaw-chuck (screw-bow). The achieved effects were evaluated on the basis of following data: metallographic analysis, chemical analysis, measurement of the geometrical parameters of the treated surface. In order to determine the corrosion resistance the potentio-dynamic tests were performed. Experiment was made in accordance with PN-76/H-04601 in aerated solution simulating sea water – 3,5% NaCl. Based on the results of carried test it was stated that the proposed method of surface preparation ensures the correct zinc coating growth on grey cast iron surface. Corrosion tests show that zinc coating created on the surface of the elements that were previously oxidized demonstrate greater resistance then zinc coating on the crude surface or surface after traditional preparation.

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