Oxidation and corrosion behavior of titanium aluminum nitride coatings by arc ion plating
(1.江西省南昌市江西科技师范学院江西省表面工程重点实验室2.Department of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330063, China3.北京市有色金属一般研究所国家工程技术有色金属金属基复合材料研究中心4.中国科学院金属腐蚀与防护研究所，金属腐蚀与防护国家重点实验室，沈阳110015)
Abstract: Composite metastable TiN and Ti1？xAlxN coatings with different Al content were deposited on 1Cr11Ni2W2MoV stainless steel for aero-engine compressor blades by arc ion plating. The results show that all coatings have a B1NaCl structure and the preferred orientation changes from (111) to (220) with increasing Al content; the lattice parameter of Ti1？xAlxN decreases with the increase of Al content. The oxidation-resistance of (Ti,Al)N coatings is significantly improved owing to the formation of Al-riched oxide on the surface of the coatings. The nitride coatings can significantly improve the corrosion-resistance of 1Cr11Ni2W2MoV stainless steel under the synergistic of water vapor and NaCl, and the corrosion-resistance becomes better when the Al content increases, because not only the quick formation of thin alumina layer prevents the further corrosion but also the formation of alumina seals the pinholes or defects in the coatings, which prevents the occurrence of localized nodules-like corrosion.
Key words: (Ti,Al)N; arc ion plating; oxidation-resistance; corrosion-resistance