High-Temperature Corrosion of AlCrSiN Film in Ar-1%SO2 Gas

Abstract

AlCrSiN film with a composition of 29.1Al-17.1Cr-2.1Si-51.7N in at. % was deposited on a steel substrate by cathodic arc ion plating at a thickness of 1.8 µm. It consisted of nanocrystalline hcp-AlN and fcc-CrN, where a small amount of Si was dissolved. Corrosion tests were carried out at 800 • C for 5-200 h in Ar-1%SO 2 gas. The major corrosion reaction was oxidation owing to the high oxygen affinity of Al and Cr in the film. The formed oxide scale consisted primarily of (Al,Cr) 2 O 3 , within which Fe, Si, and S were dissolved. Even after corrosion for 200 h, the thickness of the scale was about 0.7-1.2 µm, indicating that the film had good corrosion resistance in the SO 2 -containing atmosphere.

Microstructure, Mechanical, Oxidation and Corrosion Properties of the Cr-Al-Si-N Coatings Deposited by a Hybrid Sputtering System

“…The performance of such coatings can be further improved by doping a third metal or nonmetal element into the CrN-based coatings, such as Al [3,9], Mo [10], Zr [11], Cu [12], C [13], Si [14] and Al-Si [15,16] elements. These elements have all been previously used to modify the structures and properties of the CrN coatings.…”