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Aluminium 5083 vs 7075 – What’s the Difference

Aluminium 5083 vs 7075

When it comes to choosing the perfect aluminium alloy for your specific application, there are numerous factors that you need to consider. One of the most crucial factors is the toughness required by your project. And when it comes to toughness, two of the most popular aluminium alloys are 5083 and 7075. But which one is the better option? In this post, we’ll be taking a closer look at the features of these two alloys to help you make an informed decision.

Difference Between Aluminium 5083 and 7075

Composition and Properties

Aluminium 5083 is an alloy primarily composed of magnesium, manganese and chromium, with smaller amounts of other elements. It has excellent welding properties and is highly resistant to corrosion, making it an ideal choice for use in marine environments.

On the other hand, Aluminium 7075 is an alloy primarily made up of zinc, magnesium, and copper. It boasts excellent strength-to-weight ratio, high strength, and good fatigue resistance. This alloy is commonly used in aerospace and automotive applications due to its exceptional strength properties.

Resistance to Corrosion

When it comes to resistance to corrosion, aluminium 5083 takes the lead. It’s highly resistant to saltwater corrosion, making it a top choice for use in the marine industry. Aluminium 7075, on the other hand, is not as resistant to certain types of corrosion, particularly in alkaline environments.

Machining and Welding

Aluminium 7075 is more challenging to machine and weld than 5083. It requires special equipment to machine and can be difficult to weld due to its high sensitivity to heat. Consequently, it’s not as commonly used in fabrication as aluminium 5083.


Cost is always a significant factor when considering materials for your application. Aluminium 7075 is more expensive than 5083 due to its exceptional strength properties. However, keep in mind that the costs are relative to the applications of each alloy.


In conclusion, Aluminium 5083 and 7075 are remarkable alloys, each with unique features. If you’re looking for an alloy that offers high strength, Aluminium 7075 is your best bet. On the other hand, if you’re looking for an alloy highly resistant to corrosion, Aluminium 5083 is the way to go. Remember that the choice between the two will ultimately depend on the specific needs of your application.

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