Study of the Ce-Mn Conversion Coating on 6061 Aluminium Alloy
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.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
J. J. Zhang et al., "Study of the Ce-Mn Conversion Coating on 6061 Aluminium Alloy", Advanced Materials Research, Vols. 189-193, pp. 838-841, 2011