Influence of layer number and sintering temperature on microstructural, tribological, and corrosion behavior of Al2O3–TiO2 multilayer coatings

Fatma Sezgi Eraslan, Irem Cemre Turu, Mucahid Ozcan, Burak Birol, Ridvan Gecu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The effects of layer number (2, 4, and 6-layer) and sintering temperature (800, 900, 1000, and 1100 °C) on the microstructure, wear, and corrosion properties of Al2O3–TiO2 multilayer coatings deposited on 316L stainless steel plates using the sol-gel dip coating technique were investigated. The wear characteristics were measured through ball-on-disc type dry sliding tests using an Al2O3 ball under a 1 N load, whereas the corrosion features were determined by potentiodynamic polarization tests conducted in a 3.5 wt% NaCl solution. Anatase, rutile, α-Al2O3, and γ-Al2O3 phases were obtained in the hybrid coatings, depending on the sintering temperatures. However, at 1100 °C, the coating did not adhere well to the substrate due to passive oxide film formation on the 316L plate, leading to spalling. Besides, the surface homogeneity deteriorated in the 6-layer coated sample due to higher organic removal and residual stresses. The corrosion rate decreased with the increasing number of layers, but the sensitivity to corrosion varied due to changes in surface properties. The 4-layer coated sample sintered at 1000 °C achieved the highest wear strength (improved by up to 71.1%) and corrosion resistance (increased by up to 90.4%) due to its decreased porosity and homogeneously distributed finer particles.

Original languageEnglish
Pages (from-to)33226-33235
Number of pages10
JournalCeramics International
Volume49
Issue number20
DOIs
StatePublished - Oct 15 2023
Externally publishedYes

Funding

This work has been supported by Yildiz Technical University Scientific Research Projects Coordination Unit under project number FYL-2023-5469 .

Keywords

  • AlO–TiO hybrid coating
  • Corrosion
  • Multilayer coating
  • Sol-gel technique
  • Wear

Fingerprint

Dive into the research topics of 'Influence of layer number and sintering temperature on microstructural, tribological, and corrosion behavior of Al2O3–TiO2 multilayer coatings'. Together they form a unique fingerprint.

Cite this