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Passivation du plomb pur et de ses alliages en milieux sulfurique et atmosphérique

Abstract : The lead protection against the corrosion is of considerable interest in the field of lead-acid batteries, and roofing materials. Recently, the Pb-Sb alloys inducing a large water hydrolysis in batteries have been replaced by low antimony alloys or Pb-Ca-Sn alloys. Nevertheless, some of these alloys cause a premature capacity loss of batteries, due to the metal passivation by isolating lead monoxyde. Firstly, this study is devoted to the determination of the passivation mechanism of Pb-Sn and Pb-Sb alloys in the conditions of deep discharge of batteries (E=+0,7V/Hg/Hg2SO4). The PbO growth mechanism has been identified with the help of 18O-marker. In function of tin or antimony content in alloys, the PbO growth is increased by a doping mechanism, or completely inhibited. The research of new protective coatings of lead in atmospheric conditions is very important for its use as roofing material. It has been shown that linear sodium monocarboxylates with long carbon chain (10 or 11 carbons) efficiently inhibit the corrosion processes in lead surface, by forming a crystallised lead compound. To ensure a long time protection, a surface treatment, imitating the phosphating treatment of zinc, was set up.
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Submitted on : Thursday, March 29, 2018 - 10:50:13 AM
Last modification on : Thursday, January 14, 2021 - 11:43:53 AM

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  • HAL Id : tel-01747054, version 1



Emmanuel Rocca. Passivation du plomb pur et de ses alliages en milieux sulfurique et atmosphérique. Autre. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10019⟩. ⟨tel-01747054⟩



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