Evaluation of high temperature corrosion resistance of CrN, AlCrN, and TiAlN arc evaporation PVD coatings deposited on Waspaloy

• Published in: Surface & coatings technology 2022-05, Vol.438, p.128398, Article 128398
• Main Authors: Biava, Giovany, de Araujo Fernandes Siqueira, Irene Bida, Vaz, Rodolpho Fernando, de Souza, Gelson Biscaia, Jambo, Hermano Cezar Medaber, Szogyenyi, Alberto, Pukasiewicz, Anderson G.M.
• Format: Article
• Language: English
• Subjects: AlCrN; AlTiN; Aluminum oxide; Arc deposition; Cathodic arc evaporation; Chemical composition; Chemical industry; Coatings; Corrosion rate; Corrosion resistance; Corrosion tests; CrN; Evaporation; High temperature; High temperature corrosion; Hot corrosion; Modulus of elasticity; Physical vapor deposition; PVD; Raman spectroscopy; Titanium dioxide; Waspaloy
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2022.128398

During the regular operation of a petrochemical plant, the degradation and corrosion of some metallic parts frequently occur. These parts are exposed, from the oil extraction to refining processes, to an environment that includes strong acids or bases, under high pressures, and high temperatures, up to 760 °C. Waspaloy (UNS N07001) is a material currently applied to manufacture components exposed to hot corrosion. This study evaluates the high temperature corrosion behavior of CrN, AlCrN, and TiAlN coatings deposited by Arc Evaporation Physical Vapor Deposition (PVD) process onto Waspaloy base material. The AlCrN and TiAlN PVD coatings showed higher hardness, 28 GPa (TiAlN) and 33 GPa (AlCrN), and elastic modulus than the CrN coating. The AlCrN coating presented the lowest corrosion rate values, 1.35 × 10−5 mg2·cm−4·s−1, while TiAlN and CrN showed higher corrosion rate values, 1.66 × 10−5 and 2.09 × 10−4 mg2·cm−4·s−1 under 700 °C hot corrosion condition. The use of X-ray diffractograms, and Raman spectroscopy, to evaluate the coating after hot corrosion tests based on chemical composition indicated that AlCrN and TiAlN coatings formed Al2O3 and TiO2 on the surface, which was responsible for their higher corrosion resistance. •CrN, TiAlN, AlCrN PVD/Waspaloy were tested in Na2SO4/NaCl hot corrosion environment.•TiAlN and AlCrN PVD showed higher hot corrosion resistance than CrN and Waspaloy.•AlCrN PVD coating formed a protective and resistant Al2O3 oxide film.