![\"Metal](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness.jpg\")
<\/p>\nAl\u00fcminyum eriyi\u011finin metal safl\u0131\u011f\u0131, yani al\u00fcminyum eriyi\u011findeki kal\u0131nt\u0131lar\u0131n azalt\u0131lmas\u0131, y\u00fcksek kaliteli \u00fcr\u00fcnlerin \u00fcretiminde \u00e7ok \u00f6nemli bir fakt\u00f6rd\u00fcr. Al\u00fcminyum ala\u015f\u0131m\u0131ndaki kal\u0131nt\u0131lar, ala\u015f\u0131m yap\u0131s\u0131n\u0131 s\u00fcreksiz hale getirir, \u00fcr\u00fcn\u00fcn s\u0131k\u0131l\u0131\u011f\u0131n\u0131 azalt\u0131r, korozyona ve \u00e7atlaklara yol a\u00e7ar ve nihai \u00fcr\u00fcn\u00fcn mekanik \u00f6zelliklerini d\u00fc\u015f\u00fcr\u00fcr.<\/p>\n
Nihai \u00fcr\u00fcnlerin farkl\u0131 kullan\u0131m alanlar\u0131na g\u00f6re, metal temizlik seviyesine ili\u015fkin gereksinimler de farkl\u0131l\u0131k g\u00f6sterir. Nihai \u00fcr\u00fcn gereksinimleri (teneke kutu, \u0131s\u0131 emici vb.) ne kadar ince olursa ya da y\u00fczey kalitesi gereksinimleri daha y\u00fcksek olan y\u00fcksek hassasiyetli levha ve folyo \u00fcretimi (PS levha taban\u0131, ayna dekorasyon levhas\u0131 vb.) ne kadar artarsa, eriyik temizli\u011fi gereksinimi de o kadar artar.<\/p>\n
Yeniden eritme s\u00fcrecinde, f\u0131r\u0131na y\u00fcklenen malzemenin t\u00fcr\u00fcne ba\u011fl\u0131 olarak, k\u0131r\u0131lm\u0131\u015f malzeme, kesim art\u0131klar\u0131 ve levha malzemesi gibi klinkerler ciddi \u015fekilde oksitlenir ve bir\u00e7ok \u00e7e\u015fit metalik olmayan kal\u0131nt\u0131 i\u00e7erir. En yayg\u0131n olanlar\u0131 alfa fazl\u0131 al\u00fcmina tozu, MgAl2O4 magnezya al\u00fcmina spinel bazl\u0131 refrakter par\u00e7ac\u0131klar\u0131 (MgAl2O4), oksit filmi, bor\u00fcr, magnezyum oksit ve magnezyum klor\u00fcr ile di\u011fer metalik olmayan oksitlerdir. Belirtilen i\u00e7eri\u011fi a\u015fan kal\u0131nt\u0131lar, al\u00fcminyum ala\u015f\u0131m\u0131n\u0131n s\u00fcreklili\u011finin bozulmas\u0131, g\u00f6zenek olu\u015fumu veya \u015ferit k\u0131r\u0131lmas\u0131 gibi \u00e7e\u015fitli sorunlara neden olabilir.<\/p>\n
<\/p>\n
PS levha taban\u0131 olarak al\u00fcminyum levha kullan\u0131ld\u0131\u011f\u0131nda, haddeleme i\u015flemi s\u0131ras\u0131nda deformasyon meydana gelir ve bu kal\u0131nt\u0131lar nihai \u00fcr\u00fcn\u00fcn y\u00fczeyinde kum delikleri olu\u015fturur. Ayr\u0131ca, baz\u0131 \u00e7ok sert kat\u0131 kal\u0131nt\u0131lar (\u00f6rne\u011fin, refrakter par\u00e7ac\u0131klar) hadde makinesi silindirlerinin y\u00fczeyine zarar verir, \u015ferit \u00fczerinde tekrarlanan izler b\u0131rak\u0131r ve \u00e7atlaklara neden olur.<\/p>\n
Al\u00fcminyum eriyikindeki hidrojen, esas olarak f\u0131r\u0131n gaz\u0131ndaki al\u00fcminyum ile su aras\u0131ndaki yo\u011fun kimyasal reaksiyondan kaynaklan\u0131r; bir k\u0131sm\u0131 ise di\u011fer kaynaklardan gelir.<\/p>\n
F\u0131r\u0131n gaz\u0131 veya havadaki hidrojen. Hidrojenin erimi\u015f al\u00fcminyumdaki y\u00fcksek adsorpsiyon \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc nedeniyle, bu durum erimi\u015f al\u00fcminyumda hidrojen emiliminin ba\u015fl\u0131ca yoludur. Buna ek olarak, al\u00fcminyum k\u00fcl\u00e7eler a\u00e7\u0131k havada depoland\u0131\u011f\u0131nda havadaki su buhar\u0131yla kolayca temas ederek nemi emer; bu da al\u00fcminyum eriyikindeki hava i\u00e7eri\u011finin artmas\u0131n\u0131n \u00f6nemli bir nedenidir. \u00c7\u00f6zelti s\u0131cakl\u0131\u011f\u0131 ne kadar y\u00fcksekse, erimi\u015f al\u00fcminyumdaki hidrojenin \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc de o kadar y\u00fcksek olur ve k\u00fcl\u00e7enin hidrojen i\u00e7ermesi ka\u00e7\u0131n\u0131lmazd\u0131r.<\/p>\n
Al\u00fcminyum eriyikindeki hidrojenin etkisi, k\u00fcl\u00e7e kat\u0131la\u015fma s\u00fcrecinde g\u00f6zeneklilik, k\u00fc\u00e7\u00fck beyaz lekeler ve di\u011fer kusurlara yol a\u00e7abilir.<\/p>\n
K\u00fcl\u00e7e s\u0131cakl\u0131\u011f\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde artt\u0131\u011f\u0131nda, yukar\u0131da bahsedilen g\u00f6zenekler, s\u0131cak haddelemeden tavlamaya kadar ge\u00e7en s\u00fcre\u00e7te k\u00fcl\u00e7enin y\u00fczeyinde kum delikleri olu\u015fturacakt\u0131r. Haddeleme i\u015flemi s\u0131ras\u0131nda \u015feridin kenarlar\u0131nda \u00e7atlaklar olu\u015facakt\u0131r.<\/p>\n
Daha \u00f6nce de belirtildi\u011fi gibi, k\u00fcl\u00e7e \u00fcretim s\u00fcrecinde erimi\u015f metalin temizli\u011finin kontrol\u00fc, \u00fcretim s\u00fcrecinin bir par\u00e7as\u0131d\u0131r.<\/p>\n