RT Journal Article
SR Electronic
A1 Verner, Petr
A1 Chrást, Vlastimil
A1 Krahula, Karel
A1 Zmrzlý, Martin
A1 Čerňanský, Marian
A1 Houdková, Jana
A1 Vorlíček, Vladimír
T1 Chromate alternatives in zinc galvanized steel surface treatment
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 54
IS 1
SP 135
OP 144
DO 10.11118/actaun200654010135
UL https://acta.mendelu.cz/artkey/acu-200601-0013.php
AB Surface treatment of zinc galvanized steel is carried out usually using chromate based baths. These baths are used for improvement of the corrosion resistance and enhancement of the chemical adhesion of organic coatings. Anticorrosive effects of the chromium conversion coatings were not completely exceeded yet by another kind of passivation. Toxicity of Cr<sup>VI</sup> is a basic problem of chromate conversion coats. This paper presents the main results and conclusions of experimental study on zinc conversion layers based on vanadates, using a good Cr<sup>VI</sup> bath as reference. Anticorrosive mechanisms were compared by the corrosion tests in saline cabinet. Inhibition effects were characterized by scanning electron microscopy, by X-ray dispersive spectrometry (EDS) associated X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy.