Journal
SURFACE & COATINGS TECHNOLOGY
Volume 375, Issue -, Pages 652-669Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2019.07.063
Keywords
Surface anodizing; Ni-LaCl3 deposits; 3D-heterotypic nanopores; Wear
Funding
- National Natural Science Foundation of China [51605203]
- Natural Science Foundation of Jiangsu Province [BK20150467]
- Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology [1062921501]
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For increasing the interfacial bonding of Ni deposits onto Ti surface, the objectives of this work are to explore an effective approach for LaCl3-modified Ni nanocrystals on porous surface of Ti substrate. Three-dimensional (3D) heterotypic nanopores were well organized with a diameter size of similar to 300 nm through surface anodizing in H3PO4-containing acid solution at DC 180 V. In view of the above considerations, the anodized surface with a 3D-open reticular structure was processed of high adsorption capacity leading into pitting growth of Ni crystals into 3D-pores. Experimental data have referred that a leaf-like surface with the diversified orientations of Ni (111) (200) (220) (311) facets were conducted for Ni-LaCl3 deposits instead of an exclusive growth of Ni (111) (200) facets for pure Ni. Based on Nanoindentation tests, it exhibited the ratio of micro hardness (H-3) and elastic modulus (E-2) of Ni samples remarkably increased with increasing LaCl3 addition from 0 to 2.0 g/L. As excepted, the steady-state friction coefficient was similar to 0.28 for Ni-2.0 g/L LaCl3 composites, which was about one order of magnitude lower than that of pure Ni sample during oxidized at 500 degrees C in air. The exceptional improvements of corrosion resistance for LaCl3-modified Ni deposits were associated with the co-existence of high adsorptive La3+ ions and the La-rich insoluble corrosive products in 1 M (mol/L) HCl solution. In light of this, Ni-based nanocomposites on 3D-heterotypic porous surface of Ti alloys would provide an effective guidance for protecting Ti alloys against wear and corrosive damages.
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