Abstract
The purpose of this article is to investigate the relationship among the material design, in situ synthesis, microstructure and mechanical properties of arc-sprayed Al-Ni-Ti amorphous coatings. The precursor reactants were designed by aluminium strip and low-purity industrial alloy powders. The results show that the Al-Ni-Ti coating displays a lamellar structure with porosity up to 1%. The volume fraction of the amorphous, crystallization temperature and hardness of the coatings are 85.9%, 365°C and 4.87 GPa, respectively. The microstructure analysis reveals that the grey region in the coating has a glassy structure and the white region has a crystalline structure of α-Al phase. In 0.6 M NaCl solution, compared with the crystalline structure of the arc-sprayed Al coating and 6061-Al alloy, the Al-Ni-Ti amorphous coating demonstrates an extraordinarily higher pitting potential (− 0.12 V) and lower corrosion current density (4.54 × 10−8 A/cm2). These investigations show that the present Al-Ni-Ti amorphous coating furnishes valuable guidance for expanding engineering applications with an inexpensive, high glass formation ability and prominent performance.
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