Effect of SiC addition on laser-based CoNi binary alloy coatings on Ti-6Al-4V alloy

Olanrewaju Seun Adesina, Abimbola Patricia Popoola, Gabriel Ayokunle Farotade, Babatunde Abiodun Obadele, Olufemi Oluseun Sanyaolu, Samson Olaitan Jeje, Azeez Lawan Rominiyi

Research output: Contribution to journalArticlepeer-review

Abstract

This research explores the impact of variations in laser scanning speed and the incorporation levels of SiC-Ni-Co powders on Ti-6Al-4V alloy using laser surface cladding technique. Key parameters, including a consistent laser power of 700 W, a 4 mm beam spot size, a powder feed rate of 1.0 g/min, and a gas flow rate of 3 L/min, along with fixed powder compositions, were maintained. The laser scanning speeds were adjusted to 0.4 m/min, 0.8 m/min, and 1.2 m/min. Microstructural analyses were carried out using scanning electron microscopy (SEM) while Vickers microhardness was employed to assess coating hardness, and corrosion properties were evaluated using a linear potentiodynamic polarization technique. Following the corrosion attack, the protective oxides formed were identified through SEM and X-ray diffractometer (XRD). The results revealed a strong metallurgical relationship between the clad layer and the substrate, demonstrating the effectiveness of the laser-clad technique. Particularly, the highest laser scan speed exhibited the most significant improvements in hardness and corrosion resistance. The coatings displayed an average hardness value of 1269.20 HV0.1, a notable fourfold increase compared to the substrate's value of 334 HV0.1. Concerning corrosion, a clear correlation emerged between scan speed and polarization resistance, confirming that higher scan speeds could lead to enhanced polarization resistance.

Original languageEnglish
JournalEmergent Materials
DOIs
Publication statusAccepted/In press - 2024
Externally publishedYes

Keywords

  • Corrosion resistance
  • Laser surface cladding (LSC) technique
  • Microstructure
  • SiC-Ni-Co powders
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Fingerprint

Dive into the research topics of 'Effect of SiC addition on laser-based CoNi binary alloy coatings on Ti-6Al-4V alloy'. Together they form a unique fingerprint.

Cite this