Interlayer-assisted growth of quenched-produced diamond coatings on Mg–Ca alloys for improved corrosion resistance in sodium chloride solution
Journal
Journal of Alloys and Compounds
Series/Report No.
Journal of Alloys and Compounds
Journal Volume
1050
Start Page
185888
ISSN
09258388
Date Issued
2026-01-15
Author(s)
Abstract
Corrosion-resistant coatings are essential for extending the service life of magnesium alloys. In this work, quenched-produced diamond (Q-dia) films were deposited on Mg-Ca alloy substrates by physical vapor deposition using high-purity graphite (99.999 %) as the carbon source. To enhance interfacial bonding, three thin interlayers (Al, Ti, and TiC) were examined as interfacial layers. Among them, the TiC interlayer effectively enabled successful adhesion and produced a uniform coating. Scanning electron microscopy (SEM) revealed dense nanodiamond grains growth with a compact, a defect-free cross section. Electrochemical analyses demonstrated that Q-dia coatings markedly enhanced the corrosion resistance of Mg-Ca alloy in 3.5 wt% NaCl solution, increasing the corrosion resistance from 0.336 kΩ.cm² to 1.78 kΩ.cm². This enhancement is attributed to the highly compact microstructure of Q-dia grains containing both sp2- and sp3 hybridized -carbon phases, as confirmed by Raman spectroscopy. These findings highlight Q-dia as promising protective coating films for improving the corrosion resistance and durability of magnesium-based alloys.
Subjects
Corrosion resistance
Electrochemical analysis
Mg-Ca alloy
Nanodiamond
Physical vapor deposition
Publisher
Elsevier Ltd
Type
journal article