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- Title
Oxidation and Hot Corrosion Behavior of Plasma-Sprayed MCrAlY-CrO Coatings.
- Authors
Zhang, Tiantian; Huang, Chuanbing; Lan, Hao; Du, Lingzhong; Zhang, Weigang
- Abstract
The oxidation and hot corrosion behavior of two atmospheric plasma-sprayed NiCoCrAlY-CrO and CoNiCrAlY-CrO coatings, which are primarily designed for wear applications at high temperature, were investigated in this study. The two coatings were exposed to air and molten salt (75%NaSO-25%NaCl) environment at 800 °C under cyclic conditions. Oxidation and hot corrosion kinetic curves were obtained by thermogravimetric technique. X-ray diffraction analysis and scanning electron microscopy with energy-dispersive x-ray spectrometry were employed to characterize the coatings' microstructure, surface oxides, and composition. The results showed that both coatings provided the necessary oxidation resistance with oxidation rates of about 1.03 × 10 and 1.36 × 10 mg/cm h, respectively. The excellent oxidation behavior of these two coatings is attributed to formation of protective (Ni,Co)CrO spinel on the surface, while as-deposited CrO in the coatings also acted as a barrier to diffusion of oxidative and corrosive substances. The greater presence of Co in the CoNiCrAlY-CrO coating restrained internal diffusion of sulfur and slowed down the coating's degradation. Thus, the CoNiCrAlY-CrO coating was found to be more protective than the NiCoCrAlY-CrO coating under hot corrosion condition.
- Subjects
OXIDATION; CHEMICAL reactions; CORROSION &; anti-corrosives; CHEMICAL inhibitors; PLASMA spraying; METAL coating; PROTECTIVE coatings
- Publication
Journal of Thermal Spray Technology, 2016, Vol 25, Issue 6, p1208
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-016-0433-5