Is a coating part of the substrate? The case of vanadium carbide on steel |
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| Authors: | S B Fazluddin A Koursaris J E Lowther H Pollak |
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| Institution: | (1) Department of Metallurgy, Faculty of Engineering, University of the Witwatersrand, P O Wits 2050, Johannesburg, South Africa;(2) Department of Physics, Faculty of Science, University of the Witwatersrand, P O Wits 2050, Johannesburg, South Africa |
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| Abstract: | Metallic surfaces, especially that of steel, are generally protected by various types of coatings. This paper presents some of the results of CEMS studies currently being made on mild steel substrate coated with a thin layer of vanadium carbide (VC). CEMS studies were done before and after coating. The internal magnetic field was found to be oriented at an angle of 48 degrees with respect to the transverse surface of the steel sample. After coating with VC at 950 °C, this value was reduced to 39 degrees. Molecular orbital calculations indicated that the electron density along the surface of the steel is significantly changed when the VC layer is formed, which leads to the changes in the magnetic field directions that are observed. The experimental data therefore reveal that vanadium from the coating diffuses into the iron substrate. |
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