Electrochemical characterization of chromate free conversion coatings on electrogalvanized steel
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The chromate conversion treatment is widely used, but it requires highly toxic chromic acid
solutions with the consequent effluent disposal and ecological problems. The removal of these toxic
chemicals is considered a priority within European Union. The corrosion resistance of three alternative
treatments applied on electrogalvanised steel, and immersed in aerated 0.3 M Na2
SO4
solution, pH 10,
at 25 °C, was investigated using electrochemical techniques. Their performance was compared with
the obtained using the traditional Cr6+-based treatment in the same conditions. The achieved results
show that the alternative coatings exhibited discrete protective properties in the sulphate solution. The
nitro-cobalt chemical conversion treatment showed similar protective properties than the traditional
Cr6+-based treatment, while with the Cr3+-based treatment those were very poor. The phosphate
treatment initially performed acceptably but as the time elapsed, its protective properties decreased.
Como referenciar
TOMACHUK, C.R.; ELSNER, C.I.; SORDI, A.R. Di. Electrochemical characterization of chromate free conversion coatings on electrogalvanized steel. Materials Research, v. 17, n. 1, p. 61-68, 2014. DOI: 10.1590/S1516-14392013005000179. Disponível em: http://repositorio.ipen.br/handle/123456789/8958. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.