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Elaboration et caractérisation physico-chimique de nanocomposites plomb/céramique pour batteries acides

Abstract : The lead alloys generally employed as electrode substrates of lead acid battery are Pb-Ca-Sn. The microstructural evolutions lead to the depreciation of mechanical and chemical properties. This work deals with new materials in order to replace Pb-Ca-Sn alloys. The battery-life extension and recycling improvement are advantageous for industrial and environment. First part of this study shows deleterious effects of secondary elements in recycled lead alloys. New materials synthesised in this work are lead based composites reinforced with small amount of ceramic in order to improve mechanical properties by ODS technology, starting from powder metallurgy. Several methods have been used to obtain powder: the first one is the mixing of commercial powders specially prepared, the second one is the evaporation under an arc plasma and the third one uses the reduction of lead salts in organic solvent. Hardness values are more stable and reached two times the one of reference alloy. In the same time, secondary creep rates are divided until four comparing to the reference. Nevertheless, corrosion resistance is poor due to porosity and large part of grain boundaries which conduct to grain removal during the experiment.In order to improve this chemical resistance, lead layers are electrodeposed from fluoborates bath. In the same way, fine layers of silica obtained by PECVD improve corrosion behaviour of Pb-Ca-Sn alloy.
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Xavier Bourgoin. Elaboration et caractérisation physico-chimique de nanocomposites plomb/céramique pour batteries acides. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10137⟩. ⟨tel-01748281⟩

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