The proper process for slagging molten aluminum

Posted By: Fernando Oliveira Industry, NFFS,

Editor's Note: The following is the first of several technical articles that have been developed by Mr. Fernando Oliveria, also known as Dr. Foundry, on behalf of our NFFS membership. Look for future technical articles in The Crucible newsletter. Have a question you would like answered by Dr. Foundry? Send your question to and see the response in a future Dr. Foundry technical article!

Slagging is a crucial step in the aluminum casting process. It involves the formation of an insulating layer, typically composed of aluminum oxide, on the surface of the molten metal. This slag layer protects the aluminum against oxidation, improves the quality of the final product, and ensures process efficiency. In this tutorial, we will explore the correct process of slagging aluminum liquid, highlighting the steps and recommended practices.