Investigation of the Ce-Mn conversion coating on 6063 aluminium alloy

• Published in: Chinese science bulletin Vol. 55; no. 29; pp. 3345 - 3349
• Main Authors: Zhang, JunJun, Li, WenFang, Du, Jun, Han, Dong, Zheng, XiaoPing
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science China Press 01.10.2010
• Subjects: 6063铝合金; Chemistry/Food Science; Earth Sciences; Engineering; Humanities and Social Sciences; Life Sciences; multidisciplinary; Physics; Science; Science (multidisciplinary); 扫描电子显微镜; 氯化钠水溶液; 电化学阻抗谱; 耐腐蚀性能; 转化膜; 高锰酸钾; KMnO; Ce(NO; ); Ce-Mn conversion coating; surfaces; corrosion resistance
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-010-3162-z

In this paper, the sustainable Ce-Mn chemical conversion coating was fabricated on 6063 aluminium alloy by means of Ce（NO3）3 and KMnO4 as the inhibitors and NaF as the accelerator. The morphologies, composition and valence state of the coating were analyzed by scanning electron microscopy （SEM）, energy dispersive spectrometry （EDS） and X-ray photoelectron spectroscopy （XPS）, respectively. The results indicated that the Ce-Mn conversion coating was formed. The anticorrosion of the coating was evaluated in 3.5 wt.% NaCl aqueous solution at room temperature by using polarization curve and electrochemical impedance spectroscopy （EIS）. It indicated that the treated surface presented better anticorrosion behavior in chloride media than on the original material surface. The corrosion resistance of Ce-Mn conversion coating was about equal to the trivalent chromium conversion coating.