It seems there is a small mistake in your question as there isn't an alloy known as 5082. I'll provide a comparison between 5182 and 5083, which are commonly used aluminum alloys. If you have a specific alloy in mind, please correct it, and I'd be happy to provide the information you need.

Alloy Composition:
5182: Primarily contains aluminum, with additions of copper, manganese, and magnesium. It is often used in the manufacturing of beverage can lids and bodies.
5083: Contains aluminum, magnesium, and traces of manganese and chromium. Known for its exceptional corrosion resistance and suitability for marine applications.

Application Focus:
5182: Commonly used in the production of beverage can lids, tabs, and bodies due to its combination of strength and formability.
5083: Widely utilized in marine applications, such as shipbuilding, as it offers excellent corrosion resistance and high strength.

Corrosion Resistance:
5182: While it provides good resistance to atmospheric corrosion, its corrosion resistance might not be as high as that of 5083.
5083: Renowned for its outstanding corrosion resistance, especially in marine environments. It is highly resistant to saltwater and other corrosive elements.

Strength Characteristics:
5182: Exhibits good strength and formability, making it suitable for shaping into various can components.
5083: Possesses high strength, particularly in comparison to 5182, making it an ideal choice for structural applications in the marine industry.

Weldability:
5182: Demonstrates good weldability, allowing for ease of joining and fabrication.
5083: While it is weldable, certain precautions need to be taken to avoid weld-induced weakening. Nevertheless, it is commonly welded for marine applications.

Understanding these differences is essential when selecting the appropriate aluminum alloy for specific applications. Consider the alloy's properties in terms of corrosion resistance, strength, formability, and weldability based on the requirements of your project or industry. If you have a specific alloy in mind or need information on a different pair of alloys, please provide the correct alloy number.