Friction and corrosion characterization and parametric optimization of Nb-doped hydrogenated amorphous carbon (a-C:H) thin films

This study focuses on enhancing the wear and corrosion resistance of AISI 4130 alloy steel, a chromium-molybdenum alloy steel, through the application of a functional thin films. Targeting various industrial uses, notably in the aerospace and automotive industries, the research aims to improve the durability and performance of AISI 4130 alloy steel. As the functional thin film, niobium-doped hydrogenated amorphous carbon (Nb-doped a-C:H) thin films were deposited using a closed-field unbalanced magnetron sputtering technique under various parameters, which were systematically optimized following the Taguchi L-9 orthogonal array method. The microstructural properties of the thin films were analyzed using a scanning electron microscope providing a comprehensive understanding of the thin films structure. The structure of the Nb-doped a-C:H thin films was examined using Raman and X-ray photoelectron spectroscopy. To evaluate the mechanical properties, microhardness tests and scratch tests were employed, providing accurate measurements of the thin film hardness and adhesion properties, which are critical for assessing performance and durability. The tribological characteristics of the Nb-doped a-C:H thin films were evaluated using a pin-on-disc tribometer, examining their wear resistance and frictional behavior under ambient air. These comprehensive analyses reveal the Nb-doped a-C:H thin films potential for applications requiring optimized surface properties, combining enhanced superior tribological and corrosion performance.

Journal

SURFACE & COATINGS TECHNOLOGY

Year

2025

Volume

498

ISSN

0257-8972

eISSN

1879-3347

DOI

10.1016/j.surfcoat.2025.131816

WoS UID

WOS:001414508000001