NDLI: Effect of Vacuum Heat Treatment on the Element Diffusion Behavior and Corrosion Resistance of $Al_{2}O_{3}-3wt.%TiO_{2}$ Coating of Q235 Steel

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Effect of Vacuum Heat Treatment on the Element Diffusion Behavior and Corrosion Resistance of $Al_{2}O_{3}-3wt.%TiO_{2}$ Coating of Q235 Steel

Content Provider	MDPI
Author	Ma, Yulin Liu, Guang Wang, Xinyu Zhang, Xupeng Zhang, Jun Cheng, Jun
Copyright Year	2022
Description	In this study, we address the effect of vacuum heat treatment on the morphology of $Al_{2}O_{3}-3wt.%TiO_{2}$ coating, element diffusion behavior, coating hardness, and corrosion resistance. The pores, cracks, and non-liquefied particles on the as-heat treated coating surface of the vacuum-heat-treated coating were observed and compared with the as-sprayed coating using a scanning electron microscope. The diffusion behavior of the elements in the coating was demonstrated by using a line scanning of a cross-section of the coating. Hardness and corrosion-resistance test results were used to judge the effect of a vacuum heat treatment on the coating. The research results show that compared with atmospheric heat treatment, the vacuum heat treatment had less effect on the pores, cracks, and non-liquefied particles on the surface of the coating. However, in the absence of new oxide formation, the pores and cracks in the cross-section of the coating were significantly improved by the vacuum heat treatment. The surface hardness and corrosion resistance of the coating were significantly improved. The crack defects were eliminated, and the uniformity of $TiO_{2}$ distribution was improved, which are the main factors that improved the coating performance after vacuum heat treatment. The combination of the coating and the substrate is strengthened, and an $Al_{2}O_{3}$ and $TiO_{2}$ interdiffusion zone is formed when the coating undergoes vacuum heat treatment, which is the main mechanism improving the performance of the AT3 coating.
Starting Page	848
e-ISSN	19961944
DOI	10.3390/ma15030848
Journal	Materials
Issue Number	3
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-01-23
Access Restriction	Open
Subject Keyword	Materials Coatings and Films Vacuum Heat Treatment Al2o3-3wt.%tio2 Plasma Spraying Rockwell Hardness Corrosion Resistance
Content Type	Text
Resource Type	Article

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