Microstructural evolution and electrochemical corrosion characteristics of Ti–Ni matrix composite in NaCl and HCl solutions

Oluwasegun Eso Falodun, Samuel Ranti Oke, Moses M. Solomon, Abiodun Bayode

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

Abstract

Ti–Ni matrix composites were produced using spark plasma sintering (SPS), a powder metallurgy technique. The influence of Ni-xTiB2 additions on the titanium matrix microstructure, hardness, and electrochemical properties was investigated. Scanning electron microscopy, hardness analysis incorporating regression analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy tests were used to characterize the titanium matrix composites. The titanium matrix induced microstructural changes, leading to the coexistence of α and β phases along grain boundaries. A more substantial equiaxed α phase was observed in the Ti+5Ni+20TiB2 composite. The X-ray diffraction analysis showed that the crystal structures of the composites were altered and that the grains were refined. The microhardness increased with the TiB2 content. The potentiodynamic polarization analysis indicated that the corrosion resistance of the composites improved with the addition of Ni and TiB2, with the Ti+5Ni+20TiB2 composite exhibiting the highest corrosion resistance. The electrochemical impedance spectroscopy revealed that the Ti+5Ni+20TiB2 composite had enhanced diffusion properties and a stable passive layer, further confirming its exceptional corrosion resistance. Additionally, the composites exhibited a distinct capacitive behavior, indicative of strong corrosion resistance. This is characterized by phase angle values close to −90° and high impedance values (109 Ω cm2) at low and medium frequencies. This is due to the formation of a very stable film on the composites in the test solutions (NaCl and HCl).

Original languageEnglish
Pages (from-to)15124-15133
Number of pages10
JournalCeramics International
Volume50
Issue number9
DOIs
Publication statusPublished - 1 May 2024

Keywords

  • Electrochemical impedance
  • Hydrochloric acid
  • Microstructure
  • NaCl
  • Potentiodynamic polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Microstructural evolution and electrochemical corrosion characteristics of Ti–Ni matrix composite in NaCl and HCl solutions'. Together they form a unique fingerprint.

Cite this