{"id":1647,"date":"2020-07-10T08:04:39","date_gmt":"2020-07-10T08:04:39","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=1647"},"modified":"2026-05-06T02:25:25","modified_gmt":"2026-05-06T02:25:25","slug":"flux-degassing","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/flux-degassing\/","title":{"rendered":"\u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632\u0627\u062a \u0628\u0648\u0627\u0633\u0637\u0629 \u0627\u0644\u062a\u062f\u0641\u0642"},"content":{"rendered":"
\n
\n
\n
\n
\n
\n

Flux degassing is a melt treatment process used in aluminum casting to remove dissolved hydrogen and non-metallic inclusions from molten aluminum alloys. It works by combining chemical fluxing with inert gas purging: a specially formulated flux powder \u2014 typically composed of salts containing chlorine and fluorine \u2014 is injected into the melt alongside a carrier gas through a rotating graphite shaft and rotor. The rotating impeller shears the gas into thousands of fine bubbles that scrub through the melt, capturing hydrogen atoms and floating oxide particles to the surface as dross. The result is cleaner, denser aluminum with significantly fewer porosity defects in the final casting.<\/p>\n

Most foundries and casthouse operations treat flux degassing as a non-negotiable step before casting. The reason is simple: liquid aluminum actively dissolves hydrogen, which forms by chemical reaction with water vapor:<\/p>\n

2Al + 3H\u2082O \u2192 Al\u2082O\u2083 + 6H<\/strong><\/p>\n

The solubility of gaseous hydrogen at the melting point of liquid aluminum (1220.7\u00b0F \/ 660.4\u00b0C) is 0.61 in\u00b3\/lb (2.2 cm\u00b3 per 100 g). But when aluminum solidifies, that solubility drops dramatically \u2014 solid aluminum at the melting point can hold only 0.014 in\u00b3\/lb (0.05 cm\u00b3 per 100 g). This means the aluminum alloy releases excess hydrogen during the solidification process, creating porosity defects distributed throughout the solid metal. The size and number of hydrogen pores depend on the initial hydrogen content, the alloy composition, and the solidification conditions.<\/p>\n

A well-executed flux degassing cycle can bring hydrogen from an initial level of 0.30\u20130.40 mL\/100g down to below 0.10 mL\/100g in 10\u201315 minutes of treatment \u2014 well within the threshold for most aerospace and automotive specifications.<\/p>\n

\"Refining

Refining Flux<\/em><\/p><\/div>\n

 If your project requires the use of Refining Flux<\/strong><\/em>, you can contact us for a free quote. <\/span><\/strong><\/em><\/a><\/p>\n

\n
\n

Table of Contents<\/p>\nToggle<\/span><\/path><\/svg><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n