{"id":8047,"date":"2021-12-14T03:14:17","date_gmt":"2021-12-14T03:14:17","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=8047"},"modified":"2021-12-14T03:14:17","modified_gmt":"2021-12-14T03:14:17","slug":"aluminum-alloys-fluxes","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/aluminum-alloys-fluxes\/","title":{"rendered":"Bahan Flux untuk Paduan Aluminium"},"content":{"rendered":"

Dalam proses pengolahan aluminium dan paduan aluminium, bahan pelebur digunakan untuk menghilangkan logam alkali dan logam alkali tanah. Paduan aluminium mengandung logam alkali dan logam alkali tanah yang berbahaya. Logam-logam berbahaya ini dapat dihilangkan secara efektif dengan menggunakan bahan pelebur MgCl\u2082 dan KCl.<\/p>\n

\"Bahan<\/p>\n

Para ahli metalurgi sudah mengetahui bahwa logam alkali dan logam alkali tanah tertentu dapat berdampak negatif terhadap kinerja paduan ringan dan ultra-ringan, bahkan dalam jumlah yang sangat kecil sekalipun. Sebagai contoh, kandungan natrium yang rendah (5 hingga 10 ppm) secara signifikan mengurangi kemampuan penggulungan panas paduan aluminium. Ketika kandungan kalsium melebihi 150 ppm, hal ini akan berdampak negatif pada kinerja peleburan paduan aluminium-silikon eutektik dan hipereutektik dalam skala yang cukup besar.<\/p>\n

Saat ini, aluminium hasil peleburan awal\u2014seperti yang biasa disebut\u2014biasanya mengandung 5 hingga 40 ppm natrium dan 50 hingga 40 ppm kalsium, dan kandungan kalsium dalam aluminium dapat mencapai ratusan ppm.<\/p>\n

Ada banyak cara untuk menghilangkan natrium dan kalsium, seperti klorinasi atau penggunaan bahan pelebur berbasis fluorida. Kelemahan dari metode-metode ini adalah penggunaan bahan-bahan yang korosif dan mencemari lingkungan (klorin, fluorida), serta menyebabkan hilangnya magnesium dalam bentuk MgCl\u2082 atau MgF\u2082. Selain itu, pemeliharaan dan pengoperasian instalasi klorinasi juga menimbulkan banyak masalah.<\/p>\n

Dengan menggunakan magnesium klorida (MgCl\u2082) sebagai bahan pelebur, kontaminasi dapat dibatasi hingga tingkat yang dapat diterima, serta natrium dan kalsium dapat dihilangkan. Sayangnya, MgCl\u2082 bersifat sangat higroskopis. Setelah terhidrasi, senyawa ini akan terurai menjadi asam klorida (HCl), oksida magnesium (MgO), dan\/atau oksiklorida magnesium pada suhu aluminium cair, yang secara signifikan mengurangi efektivitasnya.<\/p>\n

Selain itu, titik lelehnya yang relatif tinggi (720\u00b0C) merupakan kelemahan lainnya, karena untuk memastikan kelancaran aliran yang memadai, bahan tersebut harus dipanaskan hingga suhu mendekati 800\u00b0C, dan dalam kebanyakan kasus, penggunaan aluminium akan dihindari sebisa mungkin. Pemanasan hingga suhu setinggi itu dilakukan untuk menghemat energi dan menghindari risiko oksidasi.<\/p>\n

Untuk mengatasi kekurangan-kekurangan tersebut, komponen-komponen berbahaya (terutama natrium dan kalsium) dihilangkan dengan cara fluks pemurnian<\/a> yang memiliki titik leleh lebih rendah daripada aluminium dan pada dasarnya tidak terpengaruh oleh kelembapan atmosfer tanpa kehilangan magnesium sama sekali. Bahan pelebur paduan aluminium merupakan campuran klorida magnesium dan klorida kalium, dengan perbandingan berat 80-60% klorida magnesium dan 20-40% klorida kalium.<\/p>","protected":false},"excerpt":{"rendered":"

In the preparation process of aluminum and aluminum alloys, fluxes are used to remove alkali metals and alkaline earth metals. Aluminum alloys contain harmful alkali metals and alkaline earth metals. These harmful metals can be effectively removed by using MgCl2 and KCl fluxes. Metallurgists are well-known that certain alkali and alkaline earth metals can adversely […]<\/p>\n","protected":false},"author":1,"featured_media":8048,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23658],"tags":[24208,24209],"class_list":["post-8047","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes","tag-aluminum-alloys-fluxes","tag-remove-alkali-metals"],"yoast_head":"\nAluminum Alloys Fluxes used to Remove Alkali Metals<\/title>\n<meta name=\"description\" content=\"In the preparation process of aluminum and aluminum alloys, fluxes are used to remove alkali metals and alkaline earth metals.\" \/>\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.aluminiumceramicfiber.com\/id\/aluminum-alloys-fluxes\/\" \/>\n<meta property=\"og:locale\" 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