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The Phase Composition of a Diffusion Zinc Coating Alloyed with Nickel on Steel 20 |
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20.09.2008 г. |
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The Phase Composition of a Diffusion Zinc Coating Alloyed with Nickel on Steel 20 B. D. Antonov, Ya. B. Chernov, A. A. Pankratov, and A. P. Shurygin Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 22, Yekaterinburg, 620219 Russia e-mail:
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Received July 20, 2004 Abstract — Peculiarities of the phase composition of a corrosion-resistant coating at a steel 20 are investigated. The coating was formed by the solid-phase thermodiffusion in a mixture of zinc and nickel powders. An x-ray microspectral analysis of a transverse microsection showed that both the surface layer of the base metal and the coating itself are formed by two elements: iron and zinc taken in varying ratios. The contents of nickel in the coating and on its surface are considerably lower than its fraction in the starting mixture. Four phases were identified by means of layer-by-layer x-ray diffraction analysis from the substrate to the coating surface. The coating becomes single-phase only in its superficial layers.
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