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Film-forming mechanism and properties of Ti/Zr/Mo colored conversion coating prepared on aluminum alloy

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Abstract

A multi-metal Ti/Zr/Mo combined inorganic salt coating was prepared on 6063 aluminum alloy using chemical conversion technology. 3D super depth digital microscope clearly showed the coating have a color appearance after the TiZrMoC (Ti/Zr/Mo chemical conversion) process. The comparison tests of adhesion force with polyester coating and electrochemical properties demonstrated this TiZrMoC process have good potential as a kind of alternatives for traditional Cr6+ toxic process. In order to discuss the film-formation mechanism of the coating, The scanning electron microscopy (SEM/EDS) and X-ray photoelectron spectroscopy (XPS) technologies were used to analysis the surface characteristic of different treating time samples. The XPS and EDS results showed that Al, Ti, Mo, Mg, O, F are the main component elements of the Ti/Zr/Mo coating. The whole conversion process can be divided into two stages generally: Firstly F- eroded the aluminum matrix and bonded with the alloy element Mg formed MgF2. At the same time Al2O3 phase also came into being as the ground layer, subsequently a mass of TiO2, Mo2O5, and bits of MoO3 were formed at the micro-cathode area as the top-layer.

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Authors and Affiliations

  1. Conversion Coating Division, Wuhan Research Institute of Materials Protection, 2, 126# Baofeng Road, Wuhan, 430030, China

    Wen Zhan, Xiaohui Liu & Gui OuYang

  2. R&D Center, State Key Laboratory of Special Surface Protection Materials and Application Technology, 2, 126# Baofeng Road, Wuhan, 430030, China

    Wen Zhan & Gui OuYang

Authors
  1. Wen Zhan
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  2. Xiaohui Liu
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  3. Gui OuYang
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Correspondence to Wen Zhan.

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Zhan, W., Liu, X. & OuYang, G. Film-forming mechanism and properties of Ti/Zr/Mo colored conversion coating prepared on aluminum alloy. Int. J. of Precis. Eng. and Manuf.-Green Tech. 3, 297–302 (2016). https://doi.org/10.1007/s40684-016-0038-y

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  • DOI: https://doi.org/10.1007/s40684-016-0038-y

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