Study of an alternative phosphate sealer for replacement of hexavalent chromium
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Surface and Coatings Technology
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This study evaluates the possibility of replacing the hexavalent chromium passivation treatment used as a
sealer after phosphating of carbon steel (SAE 1010) by a treatment with niobium ammonium oxalate (Ox).
Samples of carbon steel (SAE 1010) after being phosphated in a zinc phosphate bath (PZn+Ni) were
immersed in solution of niobium ammonium oxalate (250 mg L−1 of Nb) either at pH 3.0 or pH 8.0. A
passivation treatment with a solution with CrO3 (200 mg L−1 of Cr6+) was also used for reference.
The corrosion resistance of the phosphated samples after passivation treatments was analyzed in a NaCl
0.5 mol L−1 solution using electrochemical impedance spectroscopy (EIS) and anodic polarization curves. Salt
spray tests were also performed to evaluate their corrosion resistance. The results showed that the highest
corrosion resistance was obtained by passivation in a solution with (250 mg L−1 of Nb) at pH 8.0.
Como referenciar
BANCZEK, E.P.; TERADA, M.; RODRIGUES, P.R.P.; COSTA, I. Study of an alternative phosphate sealer for replacement of hexavalent chromium. Surface and Coatings Technology, v. 205, n. 7, p. 2503-2510, 2010. DOI: 10.1016/j.surfcoat.2010.09.053. Disponível em: http://repositorio.ipen.br/handle/123456789/8207. 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.