Acta Univ. Agric. Silvic. Mendelianae Brun. 2006, 54(1), 135-144 | DOI: 10.11118/actaun200654010135
Alternativy chromátování v protikorozní ochraně galvanicky vyloučených zinkových povlaků
- 1 Ústav techniky a automobilové dopravy, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
- 2 Ústav fyziky materiálu, Akademie věd České republiky Brno, Česká republika
- 3 Strojní fakulta, VUT Brno, Česká republika
- 4 Fyzikální ústav, Akademie věd České republiky Praha, Česká republika
Navržené analytické metody hodnocení ochranné účinnosti jednotlivých typů pasivačních vrstev potvrzují chování Cr inhibitoru v jednotlivých oxidačních stavech v prostředí NSS.
U navržené silnovrstvé pasivační vrstvy s přídavkem inhibiční vrstvy obsahující Sr(VO3)2 byla potvrzena lepší antikorozní účinnost povlaku oproti samostatné silnovrstvé pasivaci obsahující pouze inhibitor CrIII. EDS analýza dokonce prokázala schopnost tohoto inhibitoru difundovat místem porušení vrstvy a společně s bariérovým efektem CrIII tvoří funkční ochranný povlak v korozním prostředí.
galvanicky zinkovaná ocel, pasivační lázně bez obsahu chromátů, solnákomora, EDS, XRD, XPS, Ramanova spektroskopie
Chromate alternatives in zinc galvanized steel surface treatment
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 CrVI 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 CrVI 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.
Keywords: zinc galvanized steel, chromate free alternative passivation baths, salt spray, EDS, XRD, XPS, Raman spectroscopy
Received: October 5, 2005; Published: December 13, 2014 Show citation
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