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COVER FLUXES

ALFLUKS-NF11

Melting point of a cover flux is lower than that of aluminum. Cover flux is applied on the surface of molten aluminum where it melts forming a continuous layer protecting the liquid metal from oxidation and absorption of atmospheric hydrogen

NF16SF

ALFLUKS-NF 16SF

Sodium free cover fluxes are used for melting hyper-eutectic aluminum-silicon alloys (alloys containing above 12.6% of Si). Hyper-eutectic alloys are modified by phosphorus, additions of which cause refining of the primary crystals of silicon. Sodium reduce the refining effect of phosphorus in such alloys.

DROSSING FLUXES

ALFLUKS-NF15

Drossing fluxes promote separation of molten aluminum entrapped in the dross (sometimes up to 80%). Besides chlorides and fluorides drossing fluxes contain oxidizing component (KNO3) reacting exothermically with aluminum when heated. Heat generated by drossing flux improves wettability and fluidity of the entrapped aluminum, drops of which coalescence and flow down to the melt. The dross treated by the drossing flux is powdery and dry. It is easily removed from the furnace. Drossing fluxes helps to reduce losses of aluminum, which makes it very economically effective particularly in remelting aluminum scrap (chips, turnings etc.).

RAFINATION FLUXES/CLEANING FLUXES

ALFLUKS-NF16

Cleaning fluxes remove oxides suspended in the melt. Similarly to the Drossing fluxes a cleaning flux is composed of mixture of chlorides, fluorides and an oxidizing agent. Cleaning fluxes generate less heat therefore their aluminum separation effect is lower. However they possess better ability to absorb oxides inclusions from the melt.

WALL CLEANING FLUXES

ALFLUKS NF-20

Wall cleaning fluxes soften oxides built up on the furnace walls. Wall cleaning fluxes contain double fluorides and an oxidizing agent. The oxidizing agent reacts with aluminum generating heat, which promotes penetration of fluorides into the built up oxides softening them. The softened oxides are easily scrapped from the wall by the furnace operator.

DEGASSING POWDER FLUXES

ALFLUKS NF18

Fluxes composed of chlorine and fluorine containing salts are used for degassing molten aluminum alloys. Degassing fluxes are commonly shaped in form of tablets. Degassing operation starts when a flux tablet is plunged by a clean preheated perforated bell to the furnace bottom. The flux components react with aluminum forming gaseous compounds (aluminum chloride, aluminum fluoride). The gas is bubbling and rising through the melt. Partial pressure of hydrogen in the formed bubbles is very low therefore it diffuses from the molten aluminum into the bubbles. The bubbles escape from the melt and the gas is then removed by the exhausting system. The process continues until bubbling ceases. Degassing flux may also be introduced by an injection method. In this case the inert gas serves as carrier for granulated flux. Besides the degassing effect the degassing treatment allows to remove non-metallic inclusions suspended in the melt (cleaning effect)

DEGASSER TABLET/DEGASTAB SF 1000 & DEGASTAB SF 2000

Degastab SF1000
Degastab SF2000

Hydrogen gas dissolves very easily in liquid Al metals, but does not dissolve in solid AL. So during solidification (liquid AL solidifies into a solid phase), hydrogen gas which initially dissolves becomes insoluble to the solid phase, and forms bubbles of gas that escape in the solid phase.

H2 gas released in the castings results in defects in the castings, in the form of holes evenly distributed throughout the castings to form a circle whose diameter is between 0.01 mm to 1.5 mm. Degaser tablets (Degastab) are made to remove H2 gas in aluminum melt, so as to reduce H2 gas to a minimum to produce clean liquid Aluminum.

Available in two types, namely Nitrogen Base Degasser (Degastab SF1000) and Cl Base Degasser (Degastab SF2000).

COATING ZIRCOT

COATING ZIRKOT 45

Coating Zircoat 45 is a fine grained and high grade pure zirconium, and water based coating. Zircoat 45 is suitable for wide range of applications in ferrous and non ferrous melting. Its also highly effective as an release agent enabling easy removal of solidified metal and dross from ingot mould, carrying ladles, tundishes, launders and buggies.


ZN and SN FLUXES

 

For other types of non ferrous metals, cover fluxes are available for casting Zn, Tin White (Sn).

ZN30 Zink Cover