Microstructural evolution and tribocorrosion performance of novel laser clad ti-ni-zro2 composite coatings in 3.5% nacl solution

Babatunde A. Obadele, Oladeji O. Ige, Peter A. Olubambi

Research output: Contribution to journalArticle

Abstract

The triboelectrochemical properties of TiNi and TiNi doped with ZrO2 laser clad coatings onto Ti6Al4V substrates have been investigated in 3.5% NaCl using potentiodynamic polarisation techniques. Laser cladding was achieved using a 2 kW Rofin Sinar continuous wave ytterbium laser system (YLS) at a scan speed of 0.0067 m/s. Microstructural analyses of the coatings revealed a strong metallurgical bond at the coatings-substrate interface with the absence of pores and cracks. There was a significant increase in surface microindentation hardness values of the cladded layers. Addition of ZrO2 improved the tribocorrosion property of the composite coatings. Ti-Ni-5ZrO2 had the lowest corrosion current density whilst TiNi10ZrO2 had the lowest tribocorrosion current density in investigated electrolyte.

Original languageEnglish
Pages (from-to)353-363
Number of pages11
JournalCeramic Transactions
Volume261
DOIs
Publication statusPublished - Jan 1 2018
Externally publishedYes

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Composite coatings
Microstructural evolution
Coatings
Lasers
Current density
Ytterbium
Laser cladding
Potentiodynamic polarization
Substrates
Electrolytes
Hardness
Corrosion
Cracks
titanium nickelide

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "The triboelectrochemical properties of TiNi and TiNi doped with ZrO2 laser clad coatings onto Ti6Al4V substrates have been investigated in 3.5{\%} NaCl using potentiodynamic polarisation techniques. Laser cladding was achieved using a 2 kW Rofin Sinar continuous wave ytterbium laser system (YLS) at a scan speed of 0.0067 m/s. Microstructural analyses of the coatings revealed a strong metallurgical bond at the coatings-substrate interface with the absence of pores and cracks. There was a significant increase in surface microindentation hardness values of the cladded layers. Addition of ZrO2 improved the tribocorrosion property of the composite coatings. Ti-Ni-5ZrO2 had the lowest corrosion current density whilst TiNi10ZrO2 had the lowest tribocorrosion current density in investigated electrolyte.",
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Microstructural evolution and tribocorrosion performance of novel laser clad ti-ni-zro2 composite coatings in 3.5% nacl solution. / Obadele, Babatunde A.; Ige, Oladeji O.; Olubambi, Peter A.

In: Ceramic Transactions, Vol. 261, 01.01.2018, p. 353-363.

Research output: Contribution to journalArticle

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AB - The triboelectrochemical properties of TiNi and TiNi doped with ZrO2 laser clad coatings onto Ti6Al4V substrates have been investigated in 3.5% NaCl using potentiodynamic polarisation techniques. Laser cladding was achieved using a 2 kW Rofin Sinar continuous wave ytterbium laser system (YLS) at a scan speed of 0.0067 m/s. Microstructural analyses of the coatings revealed a strong metallurgical bond at the coatings-substrate interface with the absence of pores and cracks. There was a significant increase in surface microindentation hardness values of the cladded layers. Addition of ZrO2 improved the tribocorrosion property of the composite coatings. Ti-Ni-5ZrO2 had the lowest corrosion current density whilst TiNi10ZrO2 had the lowest tribocorrosion current density in investigated electrolyte.

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