{"id":1476,"date":"2026-05-30T21:02:34","date_gmt":"2026-05-30T18:02:34","guid":{"rendered":"https:\/\/cfc.codev-eg.com\/?page_id=1476"},"modified":"2026-06-03T01:46:37","modified_gmt":"2026-06-02T22:46:37","slug":"demaging-flux","status":"publish","type":"page","link":"https:\/\/cfc.codev-eg.com\/ar\/products\/metallurgical-chemicals\/non-ferrous-metal-treatment\/aluminum-treatment\/demaging-flux\/","title":{"rendered":"Demaging flux"},"content":{"rendered":"\t\t
\n\t\t\t\t
\n\t\t
\n\t\t
\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

Aluminium Treatment \u2014 Demagging\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Demagging\nFlux<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Demagging flux is a reactive aluminium flux used to reduce the dissolved magnesium content of an aluminium melt that has exceeded alloy specification limits \u2014 converting excess Mg to a skimmable slag compound and restoring the melt to its target chemistry before pouring, preventing hot shortness and porosity in the resulting castings.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Excess magnesium in an aluminium melt arises most often in secondary operations when high-Mg scrap alloys are mixed with lower-Mg target grades, resulting in a heat with Mg above specification. At elevated Mg levels, aluminium die casting alloys exhibit hot shortness \u2014 cracks forming in the casting during ejection \u2014 and gravity casting alloys show increased porosity and surface roughness. CFC Egypt's EGYFLUX 100 (demagging flux) is worked into the melt by plunging and stirring, where it reacts with dissolved magnesium to form magnesium compounds that float to the surface as slag for skimming. The treatment brings the Mg level back within specification, salvaging a heat that would otherwise need to be diluted with low-Mg primary metal or scrapped entirely.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t\n\t\tRequest a quote\n\t<\/a>\t\t\t\t\t\n\t\tAll aluminium treatment\n\t<\/a>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

01<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Where Demagging Flux Is Required\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

Demagging is a corrective treatment for aluminium heats where magnesium has exceeded the alloy specification \u2014 most commonly in secondary aluminium and recycling operations.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Secondary Aluminium \u2014 Variable Scrap Composition\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

The most common use of demagging flux is in secondary aluminium operations where the scrap input contains a higher proportion of Al-Mg alloys than planned \u2014 5xxx wrought scrap, Al-Mg gravity casting returns, or unidentified mixed scrap. When the bath sample comes back with Mg above the target alloy specification, demagging flux treatment corrects the heat before it is poured or cast, avoiding the production of non-conforming material.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

High-Pressure Die Casting \u2014 Preventing Hot Shortness\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

HPDC alloys such as EN AC-46000 (Al Si9 Cu3) are formulated with Mg below 0.55% for a reason: elevated Mg causes hot shortness \u2014 the tendency of the casting to crack during ejection from the die while still hot. Hot shortness results in scrap castings, damaged tooling, and production stoppages. Demagging flux treatment of the holding furnace metal when Mg is found to be above specification prevents these quality and downtime consequences.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Alloy Grade Switching \u2014 Heel Metal Management\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

When switching furnace production between alloy grades \u2014 for example, from an Al-Mg alloy to a lower-Mg die casting alloy \u2014 residual heel metal in the furnace contains elevated Mg from the previous charge. Rather than waiting for the Mg to dilute through multiple charges (at the cost of out-spec metal), demagging flux treatment of the heel reduces the Mg to a level compatible with the next alloy, accelerating grade transition and minimising the quantity of off-spec transition metal produced.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Automotive Scrap Recycling \u2014 Al-Mg Content Control\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

As automotive bodywork adopts more 5xxx series aluminium sheet \u2014 hood panels, door skins, and structural sills \u2014 end-of-life vehicle scrap streams contain increasing proportions of Al-Mg alloys. Secondary aluminium remelters processing automotive scrap and targeting standard die casting alloys must manage Mg content actively. Demagging flux gives operators a reliable tool for Mg correction when scrap analysis or bath sampling shows the melt has drifted above specification.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

02<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

CFC Demagging Flux Product\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

EGYFLUX 100 \u2014 reactive demagging flux for aluminium, reducing dissolved magnesium to within specification by converting excess Mg to skimmable slag compounds.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

03<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Frequently Asked Questions\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

Technical questions on magnesium excess in aluminium and how demagging flux corrects it.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\n\t\t\t\t\t
What causes excess magnesium in an aluminium melt? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Excess magnesium most commonly arises from: processing mixed-source secondary scrap that includes high-Mg alloy components mixed with lower-Mg target alloys; alloy chemistry drift where the charge balance is calculated incorrectly or scrap analysis is uncertain; and carry-over from a previous heat when the furnace is not fully emptied between alloy grades. In secondary aluminium operations processing variable-composition scrap, magnesium drift above specification is a routine operational issue requiring an effective corrective treatment.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
\n\t\t\t\t\n\t\t\t\t\t
What problems does excess magnesium cause in aluminium casting? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Excess magnesium above alloy specification limits causes multiple casting quality problems. In die casting alloys with low Mg limits, elevated Mg increases melt viscosity, promotes oxide film formation, and causes hot shortness \u2014 cracking of the casting during ejection from the die. In gravity casting alloys, excess Mg causes porosity and rough casting surfaces. In all cases, out-of-spec Mg makes the heat non-conforming against the alloy chemistry certificate and may not be usable for customer-specified production.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
\n\t\t\t\t\n\t\t\t\t\t
How does demagging flux remove magnesium from the aluminium melt? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Demagging flux is worked into the molten aluminium by plunging and stirring. The reactive components of the flux react with dissolved magnesium to form magnesium compounds \u2014 typically magnesium chloride \u2014 that are insoluble in the aluminium bath and float to the surface as slag. This slag is then skimmed from the bath, removing the reacted magnesium compounds and reducing the dissolved magnesium content of the remaining aluminium. Multiple treatment cycles may be required for large magnesium reductions.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
\n\t\t\t\t\n\t\t\t\t\t
Which CFC product is the demagging flux for aluminium? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

CFC Egypt manufactures EGYFLUX 100 as the demagging flux for aluminium. It is used to reduce excess dissolved magnesium in the aluminium melt when the Mg level exceeds alloy specification \u2014 most commonly in secondary aluminium operations processing variable-composition scrap. Contact CFC for dosing guidance based on the starting Mg level, target Mg level, furnace size, and alloy grade.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t