Production of Chromium Boride Layers on Carbon Steel with Conversion Treatment: Chromium Deposition + Diffusion Annealing |
| R. Boubaayaa, Y. Benarioua b, O. Allaoui a and M. Djendel a
aLaboratoire Génie des Procédés, Université de Laghouat, BP 37G, Laghouat, Algeria bDépartement de Génie Mécanique, Faculté de Technologies, Université de M'Sila, BP 166, M'Sila 28000, Algeria |
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| The present study has been conducted in order to obtaining chromium boride layers on carbon steel using a conversion: processing comprising the following steps: boriding treatment in order to increase the amount of boron atoms in the steel surface, deposition of a thin layer of pure chromium using electrolytic method, and finally an annealing treatment for boron diffusion and formation of boride layer until complete transformation of chromium layer. Depending on the method used (chromium deposition followed by boriding or boriding followed by chromium deposition) and the holding time, the partial or complete conversion is obtained as a result of the diffusion process. The role of the annealing temperature on transformation rates of chromium into chromium boride films was investigated. It is shown that for 1 h at 900°C, the chromium layer is totally transformed. The scanning electron microscopy analysis and X-ray diffraction showed the presence of CrB and CrB2 chromium borides in addition of FeB and Fe2B iron borides. |
DOI: 10.12693/APhysPolA.132.541 topics: carbon steel, boriding, chromium plating, diffusion annealing, chromium boride |