Zinc alloy chemistry in the foundry
Background:Zinc alloy pressure diecasting has been a recognised manufacturing process since the early 1900's, at which time it was common practice to add impurities such as lead, tin, antimony and others. It was generally believed that these additions improved the castability of the alloy. These were added without any knowledge of their long or short-term effects on the alloy properties.
The whole pattern of thought changed in the 1920- 30's when research by the New Jersey Zinc company proved that certain impurities were detrimental to long term stability of the alloy structure. This in turn had a major effect on the mechanical properties and performance of zinc alloy pressure diecastings.
This work broadly established the current alloy specification. In particular, the need to control certain impurities and the use of special high grade zinc as the prime feedstock for alloy manufacture. The research has continued and has led to a consistent refinement of world Zinc alloy standards.
All Brock Zinc alloys are produced to exacting standards and therefore it is important to maintain the alloy chemistry by careful process and good working practice.
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