# Home foundry — melting aluminum, mitigating undesirables

I am going to be melting aluminum cylinder head and some soda cans in the home foundry. I am aware the sulphur and the hydrogen present in the melt can make aluminum prone to cracks and brittle.

Are there recommended ingredients that can be put inside the molten aluminum besides flux that precipitates or remove undesirables?

• welcome to SE, remember that soda cans would have carbon due to coatings and carbon tends to make aluminium brittle. I am not sure how can you get rid of carbon because passing oxygen to form $CO_2$ might also oxidize your aluminium. I would suggest adding pure aluminium ingot to atleast dilute your melt of the undesirables. Aug 9 '20 at 10:50
• well I didn't know that. This is crucial information. I am more interested in not having to buy pure aluminum ingot because that will un-motivate me for the purpose I am recycling the aluminum. Aug 9 '20 at 10:52