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Effect of Vacuum Heat Treatment on the Element Diffusion Behavior and Corrosion Resistance of Al2O3-3wt.%TiO2 Coating of Q235 Steel

Materials, 2022-01, Vol.15 (3), p.848 [Peer Reviewed Journal]

2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;2022 by the authors. 2022 ;ISSN: 1996-1944 ;EISSN: 1996-1944 ;DOI: 10.3390/ma15030848 ;PMID: 35160794

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  • Title:
    Effect of Vacuum Heat Treatment on the Element Diffusion Behavior and Corrosion Resistance of Al2O3-3wt.%TiO2 Coating of Q235 Steel
  • Author: Ma, Yulin ; Liu, Guang ; Wang, Xinyu ; Zhang, Xupeng ; Zhang, Jun ; Cheng, Jun
  • Subjects: Al2O3-3wt.%TiO2 ; Aluminum oxide ; Ceramic glazes ; Corrosion effects ; Corrosion resistance ; Corrosion tests ; Cracks ; Cross sections ; Diffusion coating ; Heat treating ; Heat treatment ; Interdiffusion ; Killed steels ; Morphology ; Plasma ; plasma spraying ; Protective coatings ; Rockwell hardness ; Sprayed coatings ; Structural steels ; Substrates ; Surface hardness ; Titanium dioxide ; vacuum heat treatment
  • Is Part Of: Materials, 2022-01, Vol.15 (3), p.848
  • Description: In this study, we address the effect of vacuum heat treatment on the morphology of Al2O3-3wt.%TiO2 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 TiO2 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 Al2O3 and TiO2 interdiffusion zone is formed when the coating undergoes vacuum heat treatment, which is the main mechanism improving the performance of the AT3 coating.
  • Publisher: Basel: MDPI AG
  • Language: English
  • Identifier: ISSN: 1996-1944
    EISSN: 1996-1944
    DOI: 10.3390/ma15030848
    PMID: 35160794
  • Source: Freely Accessible Journals
    DOAJ Directory of Open Access Journals
    ROAD
    PubMed Central
    ProQuest Central
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