Improving the Corrosion Resistance of Hot-Working Mold Steel against Al Alloy Melt by Coating
In order to reduce the adhesion tendency of aluminum melt on the die casting mold and extend the service life of the die, multi-arc ion plating technique was used to deposit Ti/TiN/CrN multi-layer coating on the surface of 8418 hot-working mold steel. Corrosion resistance of the steel and the Ti/TiN/CrN coating against Al alloy melt was studied. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used to study the microstructure, phase constituent and phase composition of the materials. Uniform Ti/TiN/CrN coatings with good bonding interfaces and a total thickness of about 2 μm were obtained. Results showed that Ti/TiN/CrN coating can improve the corrosion resistance of the 8418 hot-working die steel significantly against the aluminum alloy melt.
Qing Liu, Jian-Feng Nie, Robert Sanders, Zhihong Jia and Lingfei Cao
Y. Y. Yi et al., "Improving the Corrosion Resistance of Hot-Working Mold Steel against Al Alloy Melt by Coating", Materials Science Forum, Vol. 877, pp. 67-72, 2017