{"id":3622,"date":"2020-08-12T10:06:51","date_gmt":"2020-08-12T10:06:51","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3622"},"modified":"2020-08-19T06:35:20","modified_gmt":"2020-08-19T06:35:20","slug":"aluminum-melt-protection","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-melt-protection\/","title":{"rendered":"Protection contre la fusion de l'aluminium"},"content":{"rendered":"<p>Il existe deux m\u00e9thodes de protection du bain d'aluminium en fusion : la premi\u00e8re consiste \u00e0 recouvrir la surface du bain d'un flux de couverture. L'autre consiste \u00e0 utiliser un alliage protecteur, c'est-\u00e0-dire \u00e0 ajouter des \u00e9l\u00e9ments oxydables \u00e0 l'alliage afin de former un film d'oxyde protecteur dense \u00e0 la surface du bain fondu. Le principe de base de ces deux m\u00e9thodes est de cr\u00e9er une surface inerte, de sorte que le gaz et le bain fondu n'interagissent pas ou que l'activit\u00e9 de la r\u00e9action chimique soit consid\u00e9rablement r\u00e9duite, afin d'assurer la protection du bain d'aluminium fondu.<\/p>\n<p>La premi\u00e8re m\u00e9thode s'applique \u00e0 tous les alliages d'aluminium. Elle permet non seulement d'emp\u00eacher l'oxydation de la masse fondue et l'absorption d'hydrog\u00e8ne, mais elle a \u00e9galement pour effet d'\u00e9liminer l'hydrog\u00e8ne. En effet, le point de fusion de l' <a href=\"http:\/\/www.alalloycasting.com\/fr\/flux-for-aluminum-melt\/\">flux de recouvrement<\/a> est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 celle du m\u00e9tal en fusion, sa densit\u00e9 est inf\u00e9rieure \u00e0 celle du m\u00e9tal en fusion et il pr\u00e9sente une bonne mouillabilit\u00e9. Un film de rev\u00eatement liquide continu peut se former \u00e0 la surface de la masse fondue afin de la s\u00e9parer des gaz du four. En g\u00e9n\u00e9ral, l\u2019oxyg\u00e8ne et la vapeur d\u2019eau ne peuvent pas ou rarement r\u00e9agir avec la masse fondue \u00e0 travers ce film, tandis que les atomes d\u2019hydrog\u00e8ne dissous dans la masse fondue peuvent traverser le film et s\u2019\u00e9chapper en raison de leur faible rayon.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3625\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1.jpg\" alt=\"Protection contre la fusion de l&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La surface de l'alliage est recouverte d'un film d'oxyde de magn\u00e9sium non adh\u00e9rent dont la teneur est sup\u00e9rieure \u00e0 1%. Ce film ne permet pas d'emp\u00eacher la r\u00e9action entre le m\u00e9tal et le gaz. C'est pourquoi, en compl\u00e9ment de la premi\u00e8re m\u00e9thode de protection, on recourt \u00e9galement \u00e0 la m\u00e9thode d'alliage protecteur.<\/p>\n<p>On ajoute du b\u00e9ryllium (5-50) \u00d7 10\u207b\u2074 \u00e0 l'alliage afin d'emp\u00eacher son oxydation pendant le temps de repos, la coul\u00e9e, ainsi que lors des traitements thermiques et du formage \u00e0 chaud ult\u00e9rieurs. Dans la masse d\u2019aluminium fondu, le b\u00e9ryllium est un mat\u00e9riau tensioactif. Son affinit\u00e9 pour l\u2019oxyg\u00e8ne est sup\u00e9rieure \u00e0 celle de l\u2019aluminium, mais son rayon ionique est inf\u00e9rieur \u00e0 celui de l\u2019aluminium et du magn\u00e9sium. Le b\u00e9ryllium se diffuse pr\u00e9f\u00e9rentiellement vers la surface de la masse fondue ou comble les fissures du film de MgO, o\u00f9 il s\u2019oxyde. L\u2019oxyde de b\u00e9ryllium, dont \u03b2 &gt; 1, pr\u00e9sente \u00e9galement les caract\u00e9ristiques d\u2019une r\u00e9sistance \u00e9lev\u00e9e, d\u2019une faible pression de d\u00e9composition et d\u2019une bonne stabilit\u00e9 thermique. Associ\u00e9 au MgO, il forme un film d\u2019oxyde de b\u00e9ryllium et de magn\u00e9sium \u00e0 structure spinelle dense, qui am\u00e9liore la r\u00e9sistance \u00e0 l\u2019oxydation de l\u2019alliage et joue un r\u00f4le protecteur efficace. Si l\u2019on n\u2019ajoute pas de b\u00e9ryllium dans un alliage d\u2019aluminium \u00e0 forte teneur en magn\u00e9sium, il est difficile de contr\u00f4ler la teneur en magn\u00e9sium du quasi-alliage pendant les processus de fusion et de coul\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum melt protection methods include two methods: one is to cover the surface of the melt with covering flux. The other is a protective alloy,&hellip;<\/p>","protected":false},"author":1,"featured_media":3624,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[3334,3344,3357,3358,3369,3370,3371,3373,3372,3360,3367,3361,3366,3365,3364,3362,3363,3368,3356,3336,3340,3339,3341,3338,3343,3342,3346,3337,3345,3347,3350,3349,3352,3355,3353,3348,3351,3354,3335,3359,3333],"class_list":["post-3622","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-melt-protection-alcoa-fjardaal","tag-aluminum-melt-protection-alcoa-iceland-aluminium","tag-aluminum-melt-protection-alcoa-iceland-aluminum","tag-aluminum-melt-protection-aluminium-company-in-iceland","tag-aluminum-melt-protection-century-aluminium","tag-aluminum-melt-protection-century-aluminium-goose-creek-sc","tag-aluminum-melt-protection-century-aluminium-india","tag-aluminum-melt-protection-century-aluminium-railings","tag-aluminum-melt-protection-century-aluminium-works","tag-aluminum-melt-protection-century-aluminum","tag-aluminum-melt-protection-century-aluminum-hawesville","tag-aluminum-melt-protection-century-aluminum-jobs","tag-aluminum-melt-protection-century-aluminum-news","tag-aluminum-melt-protection-century-aluminum-robards-ky","tag-aluminum-melt-protection-century-aluminum-sebree","tag-aluminum-melt-protection-century-aluminum-sebree-ky","tag-aluminum-melt-protection-century-aluminum-sebree-llc","tag-aluminum-melt-protection-century-aluminum-ware","tag-aluminum-melt-protection-century-iceland-aluminum","tag-aluminum-melt-protection-iceland-aluminium","tag-aluminum-melt-protection-iceland-aluminium-company","tag-aluminum-melt-protection-iceland-aluminium-exports","tag-aluminum-melt-protection-iceland-aluminium-factory","tag-aluminum-melt-protection-iceland-aluminium-foil","tag-aluminum-melt-protection-iceland-aluminium-industry","tag-aluminum-melt-protection-iceland-aluminium-mine","tag-aluminum-melt-protection-iceland-aluminium-production","tag-aluminum-melt-protection-iceland-aluminium-smelter","tag-aluminum-melt-protection-iceland-aluminium-statistics","tag-aluminum-melt-protection-iceland-aluminum","tag-aluminum-melt-protection-iceland-aluminum-company","tag-aluminum-melt-protection-iceland-aluminum-exports","tag-aluminum-melt-protection-iceland-aluminum-industry","tag-aluminum-melt-protection-iceland-aluminum-plants","tag-aluminum-melt-protection-iceland-aluminum-production","tag-aluminum-melt-protection-iceland-aluminum-smelter","tag-aluminum-melt-protection-iceland-aluminum-smelting-plant","tag-aluminum-melt-protection-iceland-aluminum-tariffs","tag-aluminum-melt-protection-nordic-aluminum-conordural","tag-aluminum-melt-protection-rio-tinto-alcan-aluminium-smelter","tag-aluminum-melt-protection-rio-tinto-alcan-iceland-co-ltd-isal"],"yoast_head":"<!-- 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