{"id":9856,"date":"2021-08-11T08:00:13","date_gmt":"2021-08-11T08:00:13","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9856"},"modified":"2021-08-11T08:00:13","modified_gmt":"2021-08-11T08:00:13","slug":"non-sodium-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/non-sodium-flux\/","title":{"rendered":"Flux sans sodium"},"content":{"rendered":"<p>En tant que fondant destin\u00e9 \u00e0 l'apport de sodium, les fondants \u00e0 base de sodium, compos\u00e9s principalement de NaF et de NaCl, sont largement utilis\u00e9s. Le sodium a g\u00e9n\u00e9ralement pour effet de favoriser la dispersion des pores dans les pi\u00e8ces moul\u00e9es en aluminium, mais en raison de sa r\u00e9action avec l\u2019humidit\u00e9 de l\u2019air, m\u00eame si le m\u00e9tal en fusion ne contient que quelques ppm de sodium, il est facile d\u2019observer une concentration en hydrog\u00e8ne plus \u00e9lev\u00e9e, ce qui favorise l\u2019oxydation de la surface du m\u00e9tal en fusion et la formation de scories. De plus, dans les alliages d\u2019aluminium de la s\u00e9rie 5000 contenant du Mg comme principal composant d\u2019alliage, une faible quantit\u00e9 de Na peut provoquer une fragilisation aux joints de grains et entra\u00eener une d\u00e9t\u00e9rioration significative de l\u2019allongement et d\u2019autres propri\u00e9t\u00e9s. C\u2019est pourquoi les fondants sans sodium sont largement utilis\u00e9s pour l\u2019\u00e9limination des scories des alliages d\u2019aluminium fondus sur les lignes de production de moulage o\u00f9 l\u2019ajout de Na n\u2019est pas souhait\u00e9.<\/p>\n<p>Les fondants sans sodium contiennent principalement des fondants \u00e0 base de chlorure, tels que le MgCl\u2082, le CaCl\u2082, le KCl, etc., qui ont un effet de suppression des scories et ne contiennent aucun sel de sodium ; ils sont m\u00e9lang\u00e9s \u00e0 des composants capables d\u2019am\u00e9liorer la r\u00e9activit\u00e9 de l\u2019aluminium fondu, tels que le KAIF, AlF\u2083, K\u2082SO\u2084, etc. Cependant, parmi les fondants \u00e0 base de chlorure, le MgCl\u2082 et le CaCl\u2082 sont hygroscopiques et doivent \u00eatre stock\u00e9s avec pr\u00e9caution. Si un fondant ayant absorb\u00e9 de l\u2019humidit\u00e9 entre directement en contact avec l\u2019aluminium fondu, il existe un risque d\u2019explosion due \u00e0 la vapeur d\u2019eau. Par cons\u00e9quent, dans la mesure du possible, l\u2019utilisation du MgCl\u2082 et du CaCl\u2082 doit \u00eatre \u00e9vit\u00e9e autant que possible. De plus, si le MgCl\u2082 ou le CaCl\u2082 r\u00e9agit avec l\u2019alliage d\u2019aluminium fondu, cela d\u00e9gage une odeur et r\u00e9duit l\u2019efficacit\u00e9 du travail. Pour les raisons susmentionn\u00e9es, \u00e0 moins d\u2019\u00eatre utilis\u00e9s dans un four ferm\u00e9, les fondants \u00e0 base de chlorure ne sont g\u00e9n\u00e9ralement pas utilis\u00e9s.<\/p>\n<p>Par cons\u00e9quent, sur la cha\u00eene de production de pi\u00e8ces moul\u00e9es o\u00f9 la pr\u00e9sence de Na n'est pas souhait\u00e9e, en tant que <a href=\"http:\/\/www.alalloycasting.com\/fr\/molten-metal-flux\/\">flux pour m\u00e9tal en fusion<\/a>\u00a0Pour l'\u00e9limination des scories, le flux sans sodium contient principalement du KCl, qui a un effet d'\u00e9limination des scories, ainsi qu'un composant am\u00e9liorant la r\u00e9activit\u00e9 avec le m\u00e9tal en fusion, tel que le KAIF\u2083, l'AlF\u2083 ou le K\u2082SO\u2084.<\/p>","protected":false},"excerpt":{"rendered":"<p>As a flux for adding Na, sodium-based fluxes mainly composed of NaF and NaCl are widely used. Na usually has the effect of promoting pore&hellip;<\/p>","protected":false},"author":1,"featured_media":9857,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[122,12346,12344,123,12345],"class_list":["post-9856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-flux","tag-molten-aluminum-alloys","tag-non-sodium-flux","tag-refining-flux","tag-slag-removal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Non sodium Flux for Slag Removal in Molten Aluminum Alloys<\/title>\n<meta name=\"description\" content=\"Non sodium flux is widely used as a flux for slag removal of molten aluminum alloys in casting production lines where it is no Na.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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