Preparation and Performace of a Black-grey Coating on AA6063 Aluminium Alloy

doi:10.11902/1005.4537.2013.217

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 177-182 DOI: 10.11902/1005.4537.2013.217

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Preparation and Performace of a Black-grey Coating on AA6063 Aluminium Alloy

CHEN Tingyi^1,²(

), LU Wen¹, LI Wenfang², FU Yeqi¹

1. School of Materials and Construction, Guizhou Normal University, Guiyang 550001, China
2. School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China

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Abstract

A chemical conversion coating on 6063 aluminum alloy was prepared with a Cr-free solution without addition of any extra oxidants at ambient temperature, with which a dark-gray Zr-containing conversion film could be obtained. Then the film was characterized by means of SEM, XRD, XPS and electrochemical workstation. It follows that the film is made up of Al, Al₂O₃, AlF₃, KZrF₃(OH)₂H₂O and KZrF₃O2H₂O. The conversion film coated aluminum alloy exhibits corrosion resistance of two orders of magnitude higher than the bare alloy. The film has a double layered structure, which may be described as a circuit with R1+R2+C2/R2+M3. The conversion film shows certain re-healing ability in natural environment and NaCl solution after the film was artificially damaged.

Key words: coloring re-healing zirconium porous film aluminum alloy 6063

Received: 02 December 2013

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Cite this article:

CHEN Tingyi, LU Wen, LI Wenfang, FU Yeqi. Preparation and Performace of a Black-grey Coating on AA6063 Aluminium Alloy. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 177-182.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.217 OR https://www.jcscp.org/EN/Y2015/V35/I2/177

Fig.1 Optical surface morphology of 6063 Al-alloy after zirconium chemical passivation treatment

Fig.2 SEM images of surface (a) and fractured zone (b) of Zr conversion coating

Fig.3 EDS result of Zr conversion coating

Table 1 Percentage of elements shown in Fig.3

Fig.4 XRD pattern of conversion coating

Fig.5 XPS spectrum of conversion coating

Fig.6 Electrochemical polarization curves of 6063 Al alloy without (a) and with (b) conversion coating

Table 2 Fitted data obtained from polarization curves shown in Fig.6

Fig.7 Electrochemical impedance spectroscopy and fitted curve of 6063 aluminum alloy with the conversion film

Fig.8 Applied current and voltage vs time for destruction of zirconium passive film

Fig.9 Electrochemical impedance spectroscopies corrosion film of destructed (a), self-healed (b) and original (c) conversion films

Fig.10 Open circuit voltage of 6063 Al alloy with zirconium passive film in 3.5%NaCl solution

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