Controlling gassing problems: degassing treatments
Gases in foundry aluminum alloys
Article REF: M218 V1
Controlling gassing problems: degassing treatments
Gases in foundry aluminum alloys

Author : Jean CHARBONNIER

Publication date: April 10, 1991 | Lire en français

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6. Controlling gassing problems: degassing treatments

There are two possible methods for limiting the level of gassing in aluminum alloy baths. The first is to avoid dissolving hydrogen as much as possible, while the second is to eliminate it by appropriate treatment.

6.1 Preventive methods

They are always preferable to curative methods, even if they are not always sufficient. A heavily gassed alloy will generally be difficult to degas. This is because gassing, generally due to the reduction of water by the alloy, is also accompanied by oxidation.

We have seen that the solubility of hydrogen in the bath depends on the temperature and water content of the atmosphere with which it comes into contact

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