Study of the Ce-Mn Conversion Coating on 6061 Aluminium Alloy

Jun Jun Zhang; Dong Han; Wen Fang Li; Jun Du

doi:10.4028/www.scientific.net/AMR.189-193.838

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 189-193Study of the Ce-Mn Conversion Coating on 6061...

Study of the Ce-Mn Conversion Coating on 6061 Aluminium Alloy

Abstract:

In this work, the green chemistry conversion coating on 6063 aluminium alloy surface was made and studied by means of (NH₄)₂Ce(NO₃)₆-H₂O₂ as inhibitor, HF-FeCl₃ as accelerator. The coating was evaluated in 3.5% NaCl at room temperature by using polarization curve and electrochemical impedance spectroscopy (EIS). The results show the corrosion current density and the conversion coating resistance, for the untreated or treated alloy, are 1.566 uA•cm^-2 and 6.621kΩ cm², 0.0545 uA•cm^-2 and 208.56 kΩ cm² respectively. It indicates the (NH₄)₂Ce(NO₃)₆-H₂O₂ treated surface presents better corrosion behaviour in chloride media than the original material surface. The morphologies, composition and valence state of the coating were examined by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The result indicates that the Ce-Mn conversion coating was made on aluminium alloy surface.

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Advanced Materials Research (Volumes 189-193)

Pages:

838-841

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.189-193.838

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Online since:

February 2011

Authors:

Jun Jun Zhang, Dong Han, Wen Fang Li, Jun Du

Keywords:

(NH₄)₂Ce(NO₃)₆, Corrosion Resistance, Deposition, H₂O₂, MnSO₄, Surface, Thin Film

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