agents de rev\u00eatement<\/a> contiennent 47,5% de KCl, 47,5% de NaCl et 5% de NaF. En ce qui concerne l'agent de recouvrement, pour am\u00e9liorer sa fluidit\u00e9, son point de fusion doit \u00eatre plus bas. D'autres agents de recouvrement sont \u00e0 base de MgCl, de KCl ou de carnallite. Ces agents de recouvrement pr\u00e9sentent une bonne fluidit\u00e9 et peuvent former une fine couche \u00e0 la surface de l'aluminium fondu. Cependant, le MgCl \u00e9tant tr\u00e8s co\u00fbteux, il est g\u00e9n\u00e9ralement utilis\u00e9 dans les fondants sans sodium. Ce fondant est utilis\u00e9 pour les alliages contenant plus de 2% de Mg, ou pour \u00e9liminer le calcium dans les alliages d'aluminium \u00e0 forte teneur en magn\u00e9sium.<\/p>\nLe fluorure de m\u00e9tal alcalin est un tensioactif capable de r\u00e9duire la tension superficielle entre le flux de la fonderie et le m\u00e9tal. Par rapport au fluorure de m\u00e9tal alcalin, le pouvoir nettoyant de surface de l\u2019AIF\u2083, du MgF\u2082 et du chlorure est relativement faible. Cela s\u2019explique par le fait que, lors de l\u2019utilisation d\u2019un flux \u00e0 base de sel fluor\u00e9 contenant du NaP et du KP, l\u2019aluminium fondu peut facilement absorber une partie du sodium et du potassium, qui sont des \u00e9l\u00e9ments tensioactifs.<\/p>\n
Les fluorures de m\u00e9taux alcalins peuvent dissoudre les oxydes en petite quantit\u00e9, ce qui facilite la p\u00e9n\u00e9tration du film d'oxyde \u00e0 la surface des scories, am\u00e9liorant ainsi la mouillabilit\u00e9 et contribuant \u00e0 s\u00e9parer les inclusions d'oxyde de l'aluminium liquide et l'aluminium des scories. Cependant, le point de fusion des fluorures de m\u00e9taux alcalins est g\u00e9n\u00e9ralement plus \u00e9lev\u00e9, ce qui limite leur application, et l\u2019utilisation de sels fluor\u00e9s s\u2019accompagne d\u2019exigences environnementales plus strictes que celles li\u00e9es aux sels de chlore purs. Les flux \u00e0 base de sels fluor\u00e9s couramment utilis\u00e9s sont la cryolite (Na\u2083AlF\u2086), le fluorure de calcium (CaF\u2082) ou le fluorosilicate de sodium (Na\u2082SiF\u2086), et leur teneur totale est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 20%.<\/p>\n
Les compos\u00e9s oxyg\u00e9n\u00e9s tels que le NaNO\u2083 et le KNO\u2083 ajout\u00e9s au fondant r\u00e9agissent avec l'aluminium pour former de l'Al\u2082O\u2083 et d\u00e9gager une grande quantit\u00e9 de chaleur. Cela permet d'am\u00e9liorer localement la fluidit\u00e9, augmentant ainsi le rendement r\u00e9el en aluminium. Dans l'agent de nettoyage du four, ces r\u00e9actions exothermiques peuvent acc\u00e9l\u00e9rer la p\u00e9n\u00e9tration du fondant dans les r\u00e9sidus du four.<\/p>","protected":false},"excerpt":{"rendered":"
The cast house flux is mainly a mixture of chloride and fluoride salts and other additives. Most fluxes are based on KCl and NaCl, and…<\/p>","protected":false},"author":1,"featured_media":10305,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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