Abstract
In the current study, the in-situ formation of Al/Al3Ti composite coating on Ti surface during aluminium TIG cladding was investigated. In this regards, pure Al wire (graid 1100) was deposited on commercially pure Ti surface by means of TIG process and the produced coatings were annealed at 823K (550°C) for different periods of time. The coatings were characterized by X-ray diffraction (XRD), optical and scanning electron microscopy (OM & SEM). The corrosion behaviour of the coatings was also examined in NaCl 3.5% electrolyte by potansiostate analysis. The results indicated that, Al/Al3Ti composite coating with average hardness value of about 250HV can successfully form on Ti surface during TIG cladding process. By annealing the produced coatings, the percentages of Al3Ti phase was increased and one adhesive and uniform Al3Ti layer was formed on clad/substrate interface. By increasing the annealing times, the thickness of Al3Ti phase has increased and reached to a value of about 2µm after 20h of annealing. The hardness and corrosion resistance of Al/Al3Ti composite coating was also enhanced by increasing the annealing time.
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