Zinc Die Casting vs. Aluminum Die Casting

Zinc and aluminum, as common metal materials, play important roles in the industrial sector.

Whether it’s zinc die casting or aluminum die casting, they each have their own advantages and characteristics.

This article delves into a comparison between zinc and aluminum in terms of strength, corrosion resistance, price, anodes, and density.

Aluminum and zinc raw material

Aluminum on the left, zinc on the right

Strength contrast

In this regard, aluminum exhibits higher strength, surpassing zinc.

Specifically, according to information from Eastern Alloys, Inc. , the tensile strength of aluminum alloys typically ranges from 170 to 310 MPa, while zinc alloys generally range from 130 to 200 MPa.

This makes aluminum die castings perform exceptionally well under heavy loads and high-stress environments.

However, despite its lower strength, zinc possesses good deformation properties and ductility, making it suitable for specific applications such as precision parts and thin-walled structures.

Corrosion resistance comparison

In this aspect, zinc demonstrates astonishing corrosion resistance.

According to information from the American Galvanizers Association, zinc effectively prevents oxidation and corrosion due to the natural oxide layer formed on its surface.

In fact, zinc’s corrosion resistance is more than twice that of aluminum. This makes zinc die castings an ideal choice for withstanding humidity, acidic environments, and saltwater corrosion.

In comparison, aluminum’s corrosion resistance is slightly inferior.

However, through the adoption of surface treatments and coating technologies, the corrosion resistance of aluminum die castings can be significantly enhanced to adapt to more severe environmental conditions.

Price comparison

When considering the price factor, aluminum die castings are generally more cost-effective. According to market data from the London Metal Exchange , taking 2023 as an example, the market price of aluminum is approximately $2,000 to $2,500 per metric ton.

On the other hand, zinc is relatively more expensive, with prices ranging around $3,000 to $4,000 per metric ton, subject to supply-demand dynamics and market fluctuations.

Comparison of anode characteristics

Another aspect worth comparing is the anode characteristics.

Zinc anodes exhibit exceptional resistance to corrosion and are commonly used to protect other metals from corrosion.

They find extensive application in preventing corrosion of steel structures. Aluminum anodes also possess certain protective properties, but in specific environments, zinc anodes usually hold the advantage.

Density comparison

Aluminum has a lower density, approximately 2.7 g/cm³, giving aluminum die castings an advantage in lightweight applications that require excellent thermal conductivity.

In contrast, zinc has a slightly higher density, around 7.1 g/cm³, but zinc die castings may be more suitable for applications requiring higher structural strength and compactness.


zinc die casting and aluminum die casting present differences in terms of strength, corrosion resistance, price, anodes, and density.

The choice of the suitable metal material depends on specific application requirements and conditions.

Whether it’s zinc or alum inum, they both play vital roles in the industrial and manufacturing sectors, bringing us numerous conveniences and innovations.

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