{"id":4947,"date":"2020-09-19T06:25:00","date_gmt":"2020-09-19T06:25:00","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4947"},"modified":"2020-09-19T06:25:00","modified_gmt":"2020-09-19T06:25:00","slug":"metal-cleanliness","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/metal-cleanliness\/","title":{"rendered":"Propret\u00e9 des m\u00e9taux"},"content":{"rendered":"<p>La puret\u00e9 m\u00e9tallique de l'aluminium fondu, c'est-\u00e0-dire la r\u00e9duction des inclusions dans l'aluminium fondu, est un facteur tr\u00e8s important dans la fabrication de produits de haute qualit\u00e9. Les inclusions pr\u00e9sentes dans les alliages d'aluminium rendent la structure de l'alliage discontinue, r\u00e9duisent la compacit\u00e9 du produit, entra\u00eenent de la corrosion et des fissures, et diminuent les propri\u00e9t\u00e9s m\u00e9caniques du produit final.<\/p>\n<p>Selon les diff\u00e9rentes utilisations des produits finis, les exigences en mati\u00e8re de niveau de propret\u00e9 du m\u00e9tal varient \u00e9galement. Plus les exigences relatives au produit fini sont strictes (bo\u00eetes de conserve, dissipateurs thermiques, etc.), ou plus la production concerne des t\u00f4les et des feuilles de haute pr\u00e9cision n\u00e9cessitant une qualit\u00e9 de surface \u00e9lev\u00e9e (supports pour plaques PS, plaques d\u00e9coratives miroir, etc.), plus les exigences en mati\u00e8re de propret\u00e9 de la masse fondue sont \u00e9lev\u00e9es.<\/p>\n<p>Au cours du processus de refusion, en fonction de la composition de la charge du four, les clinkers (tels que les mat\u00e9riaux concass\u00e9s, les chutes d\u2019usinage et les mat\u00e9riaux en plaques) subissent une forte oxydation et contiennent de nombreux types d\u2019inclusions non m\u00e9talliques. Les plus courantes sont la poudre d\u2019alumine en phase alpha, les particules r\u00e9fractaires \u00e0 base de spinelle de magn\u00e9sie-alumine (MgAl\u2082O\u2084), le film d\u2019oxyde, le borure, l\u2019oxyde de magn\u00e9sium, le chlorure de magn\u00e9sium et d\u2019autres oxydes non m\u00e9talliques. Les inclusions d\u00e9passant la teneur sp\u00e9cifi\u00e9e peuvent entra\u00eener divers probl\u00e8mes, tels que la rupture de la continuit\u00e9 de l\u2019alliage d\u2019aluminium, la formation de porosit\u00e9s ou la rupture de la bande.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4948\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness.jpg\" alt=\"Propret\u00e9 des m\u00e9taux\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Lorsque la plaque d'aluminium est utilis\u00e9e comme support pour les plaques PS, le laminage entra\u00eene une d\u00e9formation, et les inclusions forment des trous de sable \u00e0 la surface du produit fini. De plus, certaines inclusions solides tr\u00e8s dures (telles que des particules r\u00e9fractaires) endommagent la surface des cylindres du laminoir, laissent des marques r\u00e9p\u00e9titives sur la bande et deviennent \u00e0 l'origine de fissures.<\/p>\n<p>L'hydrog\u00e8ne pr\u00e9sent dans l'aluminium fondu provient principalement de la r\u00e9action chimique intense entre l'aluminium et l'eau contenue dans les gaz du four, mais une partie provient \u00e9galement d'autres sources.<\/p>\n<p>L'hydrog\u00e8ne pr\u00e9sent dans les gaz de four ou dans l'air. En raison de la forte solubilit\u00e9 par adsorption de l'hydrog\u00e8ne dans l'aluminium fondu, il s'agit du principal m\u00e9canisme d'absorption de l'hydrog\u00e8ne dans ce dernier. De plus, les lingots d\u2019aluminium entrent facilement en contact avec la vapeur d\u2019eau pr\u00e9sente dans l\u2019air et absorbent ainsi de l\u2019humidit\u00e9 lorsqu\u2019ils sont stock\u00e9s \u00e0 l\u2019air libre, ce qui constitue \u00e9galement une cause importante de l\u2019augmentation de la teneur en air dans l\u2019aluminium fondu. Plus la temp\u00e9rature de la solution est \u00e9lev\u00e9e, plus la solubilit\u00e9 de l\u2019hydrog\u00e8ne dans l\u2019aluminium fondu est importante, et il est in\u00e9vitable que les lingots contiennent de l\u2019hydrog\u00e8ne.<\/p>\n<p>La pr\u00e9sence d'hydrog\u00e8ne dans l'aluminium fondu peut entra\u00eener l'apparition de porosit\u00e9s, de petites taches blanches et d'autres d\u00e9fauts lors du processus de solidification du lingot.<\/p>\n<p>Lorsque la temp\u00e9rature du lingot augmente consid\u00e9rablement, les pores mentionn\u00e9s ci-dessus forment des trous de sable \u00e0 la surface du lingot, depuis le laminage \u00e0 chaud jusqu'au recuit. Au cours du processus de laminage, le bord de la bande se fissure.<\/p>\n<p>Comme nous l'avons d\u00e9j\u00e0 \u00e9voqu\u00e9, dans le processus de fabrication des lingots, le contr\u00f4le de la propret\u00e9 du m\u00e9tal en fusion fait partie int\u00e9grante du processus de fabrication.<\/p>\n<p>Il s'agit d'une \u00e9tape tr\u00e8s importante, c'est pourquoi il est n\u00e9cessaire de traiter le m\u00e9tal alcalin pr\u00e9sent dans l'aluminium liquide issu de l'\u00e9lectrolyse, de traiter le m\u00e9tal alcalin et les inclusions pr\u00e9sentes dans la masse fondue dans le four, et d'\u00e9liminer l'hydrog\u00e8ne dans le <a href=\"http:\/\/www.alalloycasting.com\/fr\/casting-launder-2\/\">canal de coul\u00e9e<\/a> au cours des diff\u00e9rentes \u00e9tapes du traitement de l'aluminium fondu.<\/p>","protected":false},"excerpt":{"rendered":"<p>The metal cleanliness of aluminum melt, that is to reduce the inclusion of aluminum melt, is a very important factor in the production of high-quality&hellip;<\/p>","protected":false},"author":1,"featured_media":4949,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4947","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>Metal Cleanliness in the Manufacturing Process of Ingots<\/title>\n<meta name=\"description\" content=\"The metal cleanliness is a very important factor in the production of high-quality products. 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