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

Poonam Yadav,Sik Kwon,Shihong Zhang,Yue Lin,Dong Lee

doi:10.3390/coatings7030044

Poonam Yadav, Sik Kwon + Show 3 more

Open Access

https://doi.org/10.3390/coatings7030044

Copy DOI

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%SO2 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)2O3, 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 SO2-containing atmosphere.

Highlights

Aluminum nitride films have good oxidation resistance due to the formation of Al2 O3 scale [1].Their properties can be enhanced by alloying with the transition metal Cr
AlCrN films have been applied on dies, molds, and cutting tools [2] for their high hardness [3], thermal stability [4], good resistance to wear [5], and oxidation [6,7,8,9]
AlCrN films were oxidized to Al2 O3 and Cr2 O3 [6], or (Cr,Al)2 O3 [9], which suppressed oxygen diffusion

Summary

Introduction

Aluminum nitride films have good oxidation resistance due to the formation of Al2 O3 scale [1]. Their properties can be enhanced by alloying with the transition metal Cr. AlCrN films have been applied on dies, molds, and cutting tools [2] for their high hardness [3], thermal stability [4], good resistance to wear [5], and oxidation [6,7,8,9]. The high-temperature oxidation of AlCrSiN films in air results in the formation of thin, dense oxide layers consisting primarily of Cr2 O3 [17], (Cr2 O3 , Al2 O3 ) [14], and (Cr2 O3 , Cr2 O5 , Al2 O3 ) [13]. The high-temperature corrosion of AlCrSiN film in a SO2 -containing atmosphere was performed, with an emphasis on TEM/EDS analyses. The microstructure, corrosion products, and corrosion mechanism of the AlCrSiN film are discussed

Experimental Section

Results and Discussion

AlCrSiN after corrosion corrosion at at 800

Conclusions