{"id":10578,"date":"2021-10-13T08:58:31","date_gmt":"2021-10-13T08:58:31","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10578"},"modified":"2021-10-13T08:58:31","modified_gmt":"2021-10-13T08:58:31","slug":"aluminium-degassing-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminium-degassing-flux\/","title":{"rendered":"Flux de d\u00e9gazage pour l'aluminium"},"content":{"rendered":"<p>Le flux de d\u00e9gazage de l'aluminium destin\u00e9 \u00e0 la fonderie permet d'\u00e9liminer les inclusions ou les contaminants gazeux pr\u00e9sents dans le m\u00e9tal en fusion \u00e0 l'aide de gaz inertes ou r\u00e9actifs.<\/p>\n<p>Les flux solides, tels que les poudres, les paillettes ou les granul\u00e9s, sont g\u00e9n\u00e9ralement compos\u00e9s de chlorures et de fluorures, ainsi que d'additifs destin\u00e9s \u00e0 leur conf\u00e9rer des propri\u00e9t\u00e9s sp\u00e9cifiques.<\/p>\n<p>La plupart <a href=\"http:\/\/www.alalloycasting.com\/fr\/adtech-fluxes\/\">flux<\/a> sont \u00e0 base d\u2019un m\u00e9lange de sels de KCl et de NaCl, formant un eutectique \u00e0 basse temp\u00e9rature (665 \u00b0C). Un autre composant courant des fondants est le fluorure de sodium (NaF), qui forme un eutectique ternaire avec le KCl et le NaCl, dont le point de fusion est de 607 degr\u00e9s Celsius. Un flux de rev\u00eatement courant contient environ 47,5% de NaCl, 47,5% de KCl et 5% de sel fluor\u00e9. La faible temp\u00e9rature de fusion est importante, car elle augmente la fluidit\u00e9 du flux.<\/p>\n<h2>Fonction du flux de d\u00e9gazage de l'aluminium<\/h2>\n<p>Certains compos\u00e9s se d\u00e9composent en d\u00e9gageant des gaz, tels que le chlore ou le dioxyde de carbone. Si ces flux p\u00e9n\u00e8trent sous la surface de la masse fondue, ils forment des bulles, r\u00e9duisant ainsi la teneur en hydrog\u00e8ne de celle-ci. Le plus connu de ces compos\u00e9s est l'hexachloro\u00e9thane (C\u2082Cl\u2086), qui se s\u00e9pare en compos\u00e9s gazeux de chlore (Cl\u2082) et d'alclore (AlCl\u2083).<\/p>\n<p>Le sel fluor\u00e9 du m\u00e9tal alcalin agit comme un tensioactif, r\u00e9duisant la tension superficielle entre le flux et la surface m\u00e9tallique, ainsi qu'entre le flux et l'oxyde. Le sel chlor\u00e9 pr\u00e9sente cette caract\u00e9ristique dans une moindre mesure.<\/p>\n<p>Les sels de fluorure de m\u00e9taux alcalins ont la capacit\u00e9 de dissoudre les oxydes (bien que dans une tr\u00e8s faible mesure), ce qui leur permet de p\u00e9n\u00e9trer dans le film d'oxyde pr\u00e9sent dans les scories et de se d\u00e9poser sur la paroi du four. Il en r\u00e9sulte une meilleure mouillabilit\u00e9, ce qui favorise la s\u00e9paration des inclusions d'oxyde de la masse fondue et de l'aluminium m\u00e9tallique des scories.<\/p>\n<p>Les additifs \u00e0 base de nitrate, tels que le KNO\u2083, peuvent entra\u00eener un d\u00e9gagement de chaleur. Ces fondants sont exothermiques. L'oxyg\u00e8ne lib\u00e9r\u00e9 lors de la d\u00e9composition du nitrate r\u00e9agit avec l'aluminium m\u00e9tallique pour former de l'Al\u2082O\u2083 et d\u00e9gager une grande quantit\u00e9 de chaleur. Cela augmente localement la vitesse de rotation et favorise la s\u00e9paration de l'oxyde m\u00e9tallique. Le flux, utilis\u00e9 pour nettoyer le four, voit cette r\u00e9action acc\u00e9l\u00e9rer la progression du flux qui p\u00e9n\u00e8tre dans la paroi du four.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminium Degassing Flux for foundry can remove inclusions or gaseous contaminants in the molten metal with inert or reactive gases. Solid fluxes, such as powders,&hellip;<\/p>","protected":false},"author":1,"featured_media":10579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminium Degassing Flux for Foundry -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Aluminium Degassing Flux for foundry can remove inclusions or gaseous contaminants in the molten metal with inert or reactive gases.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/aluminium-degassing-flux\/\" \/>\n<meta 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