Abstract

TOMACHUK, C.R.; ELSNER, C.I.  and  DI SARLI, A.R.. Behavior of Electrogalvanized Steel Pre-Treated with Cr(III)-Based Baths and Exposed to 0.5 M Na₂SO₄ Solution. Port. Electrochim. Acta [online]. 2012, vol.30, n.3, pp.145-162. ISSN 0872-1904.  https://doi.org/10.4152/pea.201203145.

As Cr (VI) compounds used to formulate conversion layers provide enhanced anticorrosive protection to zinc coatings, but they are produced using hazardous chemicals, the development of ''green'' technologies is a paramount purpose. Consequently, the corrosion behavior of zinc coatings subjected to a Cr³⁺ based passivating treatment, with and without sealing, was studied through EIS measurements in 0.5 M Na₂SO₄ solution. The analyses of the experimental data allowed inferring that the Cr³⁺-based conversion treatment with an adequate sealer provides good corrosion resistance and, coupled to an adequate painting system, could be a suitable alternative to traditional chromate coatings.

Keywords : corrosion; trivalent chromium; conversion layer; sealing treatment; electrogalvanized steel.

        · text in English     · English ( pdf )