Influence of phase composition and microstructure on corrosion behavior of laser based Ti�Co�Ni ternary coatings on Ti�6Al�4V alloy

Adesina, Olanrewaju Seun and Obadele, Babatunde Abiodun and Farotade, Gabriel Ayokunle and Isadare, Dayo Adeyemi and Adediran, Adeolu Adesoji and Ikubanni, Peter Pelumi (2020) Influence of phase composition and microstructure on corrosion behavior of laser based Ti�Co�Ni ternary coatings on Ti�6Al�4V alloy. Journal of Alloys and Compounds, 827. p. 154245.

Text 1-s2.0-S0925838820306083-main.pdf Download (4MB)

Abstract

Although Tie6Ale4V alloy has wide applications in marine and chemical industries, its application is highly limited in corrosive environment such as sulphuric acid. This is due to the dissolution of the passive titanium hydride (TiH 2) film formed on the surface which accelerates the corrosion of titanium alloy in concentrated sulphuric acid. In this work, laser surface modification technique was used to develop high performance antiecorrosive coatings for aggressive sulphuric environment. The effects of parameter variations and volume fraction of TieCoeNi clad layer on Tie6Ale4V were investigated. The corrosion behaviors of Ti-6A-l4V, TiCoe10Ni and CoNie10Ti coatings were studied in 0.5 M sulphuric acid using potentiodynamic polarization technique. Thereafter, the morphologies of the coatings before and after corrosion were analyzed using scanning electron microscope (SEM) equipped with energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD) analysis to examine phase compositions and changes. The corrosion result shows that the clad compositions have significant influence on the po- tential by shifting the potential to more noble values and reduced the corrosion rate when compared with as-received Tie6Ale4V. In addition, the corrosion resistance performance of CoNie10Ti deposited at 1.2 m/min is best among all the ternary coated samples. The increase in corrosion resistance of alloys with cobalt and nickel on titanium is due to formation of dense passive CoO, TiO, TiAl, Ni 2TiO 3, V 2O 5 and Al 2O 3 oxides on the samples surfaces. With this result, the use of laser cladding technique could be established in improving the corrosion resistance of Tie6Ale4V with TieCoeNi alloy coatings.

Item Type:	Article
Subjects:	T Technology > TN Mining engineering. Metallurgy
Depositing User:	Engr Adeolu Adesoji ADEDIRAN
Date Deposited:	12 Jan 2024 15:12
Last Modified:	12 Jan 2024 15:12
URI:	https://eprints.lmu.edu.ng/id/eprint/4281

Actions (login required)

View Item