NDLI: Effects of heat treatment on the corrosion resistance of carbon steel coated with LaMgAl$_{11}$O$

Content Provider	Springer Nature Link
Author	Huang, Liang liang Meng, Hui min Liang, Li kang Li, Sen Shi, Jin hui
Copyright Year	2015
Abstract	LaMgAl$_{11}$O$_{19}$ thermal barrier coatings (TBCs) were applied to carbon steels with a NiCoCrAlY bond coat by plasma spraying. The effects of heat treatment on the corrosion resistance of carbon steel coated with LaMgAl$_{11}$O$_{19}$ TBCs were investigated in 3.5wt% NaCl solution using polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results show that a large number of cracks are found in the LaMgAl$_{11}$O$_{19}$ TBCs after the samples are heat-treated, including some through-thickness cracks. The corrosion forms of the as-sprayed and heat-treated TBCs are uniform corrosion and pitting corrosion, respectively. The as-sprayed TBCs exhibit three EIS time constants after being immersed for less than 7 d, and then a new time constant appears because of steel substrate corrosion. When the immersion time is increased to 56 d, a Warburg impedance (W) component appears in the EIS data. The EIS data for the heat-treated TBCs exhibit only two time constants after the samples are immersed for less than 14 d, and a new time constant appears when the immersion time is increased further. The heat treatment reduces the corrosion resistance of carbon steel coated with LaMgAl$_{11}$O$_{19}$ TBCs. The corrosion products are primarily γ-FeOOH and Fe$_{3}$O$_{4}$.
Starting Page	1050
Ending Page	1059
Page Count	10
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	22
Issue Number	10
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2015-09-30
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	thermal barrier coatings carbon steel corrosion plasma spraying heat treatment Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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