Article: Antimony in aluminum scrap.

Since 1978, some European foundries have used antimony (Sb) to produce a permanently refined Al-Si eutectic alloy for the production of certain automotive castings, including wheels, brake master cylinders, connecting rods, suspension arms and brake calipers.

However, U.S. foundrymen have expressed concern that trace amounts of Sb could show up in secondary aluminum ingot and affect the mechanical properties of castings.

Although the secondary aluminum industry segregates scrap to minimize arbitrary mixing of different scrap types, some mixing does occur. Trace elements from the chemistry of one type of aluminum can deleteriously affect the properties of ...

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