{"id":4937,"date":"2020-12-25T06:16:01","date_gmt":"2020-12-25T06:16:01","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=4937"},"modified":"2020-12-25T06:16:01","modified_gmt":"2020-12-25T06:16:01","slug":"salt-flux","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/salt-flux\/","title":{"rendered":"Salt Flux"},"content":{"rendered":"<p>The salt flux for aluminum alloy is generally composed of chlorides and fluorides of alkali metals and alkaline earth metals, and its main components are KCl, NaCl, Na3A1F6, Na2SiF6, etc. The physical and chemical properties of the flux (melting point, density, viscosity, volatility, hygroscopicity, and interface with oxides, etc.) play a decisive role in the refining effect.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4938\" src=\"https:\/\/aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/12\/Salt-Flux.jpg\" alt=\"Salt Flux\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/12\/Salt-Flux.jpg 500w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/12\/Salt-Flux-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Chlorine Salt<\/strong><\/p>\n<p>Chloride salt is a common basic component in aluminum alloy flux, and the mixed salt of 45% NaCl + 55% KCl is widely used. Because they have a strong ability to wet solid Al2O3, inclusions and oxide films, and are significantly less than the specific gravity of the aluminum melt at the melting temperature, they can spread well on the surface of the aluminum melt, breaking and adsorbing the surface of the melt. Oxide film. However, for fluxes containing only chloride salts, the crushing and adsorption processes proceed slowly, and manual stirring must be carried out to accelerate the above process. Chloride has low surface tension and good wettability. It is suitable as <a href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/portfolio\/covering-flux\/\">\u0639\u0627\u0645\u0644 \u0627\u0644\u062a\u063a\u0637\u064a\u0629<\/a>. Among them, chloride salts with molecular crystals such as CCl4, SiCl4, A1C13, etc. can be used as purifiers alone, while chloride salts with ionic crystals are suitable for mixed salt flux.<\/p>\n<p><strong>Fluoride Salt<\/strong><\/p>\n<p>Add NaF to the chloride salt mixture. Na3A1F6, CaF2. A small amount of fluoride salt is mainly used for refining, such as adsorption and dissolution of Al2O3. The fluoride salt can also effectively remove the oxide film on the surface of the melt and improve the degassing effect. The fluoride salt can chemically react with the aluminum melt to form gaseous A1F, SiF4, BF3, etc. They use mechanical action to promote the separation of the oxide film from the aluminum melt, and squeeze the oxide film to push into the flux.<\/p>\n<p>The presence of fluoride salt significantly accelerates the destruction process of the oxide film on the surface of the aluminum melt, and the hydrogen in the melt can easily escape. The fluoride salt (especially CaF2) can increase the surface tension of the mixed molten salt, spheroidize the molten salt that has adsorbed oxides, facilitate separation from the melt, and reduce the loss caused by the solid molten slag entrapped in aluminum. The increase of the surface tension of the melt accelerates the process of flux adsorption and inclusion.<\/p>","protected":false},"excerpt":{"rendered":"<p>The salt flux for aluminum alloy is generally composed of chlorides and fluorides of alkali metals and alkaline earth metals, and its main components are KCl, NaCl, Na3A1F6, Na2SiF6, etc. The physical and chemical properties of the flux (melting point, density, viscosity, volatility, hygroscopicity, and interface with oxides, etc.) play a decisive role in the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4938,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4937","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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