5083 VS 6061 which is suitable marine grade aluminum

2023-09-05 15:20:13

Aluminium alloys 5083 VS 6061

Aluminium alloys come in various grades, each with its unique physical and mechanical properties that determine their applications. Among these, 5083 and 6061 are commonly used in shipbuilding as marine grade aluminum sheets.

5083 aluminum sheet belongs to the 5xxx series and is known for its excellent welding performance and corrosion resistance. It can be welded using different methods, producing joints with strength equal to that of the annealed state. Additionally, it offers good elongation, cold formability, and reliable corrosion resistance. Its tensile strength, yield strength, and elongation increase as the temperature decreases, and it exhibits excellent low-temperature toughness.

In terms of corrosion resistance, 5083 alloy performs well in various conditions, including the atmosphere, fresh water, sea water, alcohol, gasoline and diesel, organic acids, concentrated nitric acid, and various food environments. However, it is susceptible to stress corrosion cracking, which can be prevented by avoiding working temperatures exceeding 65 degrees Celsius.

5083 alloy finds wide applications, such as in the storage and transportation of petroleum and industrial gases, ship hulls (e.g., speedboats, navy ships, and construction ships), mechanical parts, and more.

On the other hand, 6061 aluminum sheet belongs to the 6xxx series and is characterized by its artificial aging state, achieved through solution heat treatment (quenching). This process enhances the strength and hardness of the aluminum plate. Common tempers for 6061 include t6, t651, and t652.

Marine grade aluminum 6061 primarily consists of magnesium (Mg) and silicon (Si), offering moderate strength, good corrosion resistance, weldability, and effective oxidation. It is particularly outstanding in processing performance, corrosion resistance, toughness, dimensional stability after processing, color film formation, and oxidation effect. Its applications are diverse and include aerospace, military products, tooling and fixtures, blow molds, thermoforming molds, automotive molds, electronic product processing, and precision equipment processing.

Distinguishing qualities between 5083 and 6061 are as follows:

  1. The strength of 6061 aluminum plate surpasses that of 5083 aluminum plate after heat treatment.
  2. 6061-T651 aluminum plate is more easily processed than 5083 aluminum sheet.
  3. 6061 alloy exhibits excellent surface treatment and anodizing properties, with slightly superior hard oxidation effectiveness compared to 5083 aluminum plate.
  4. 6061 also possesses notable corrosion resistance that remains unaffected when exposed to air, albeit not as robust as that of 5083 aluminum plate.