Marine aluminium alloy sheet has good corrosion resistance

Aluminium and its alloy elements are chemically active, and when they react with oxygen they form a stable oxide film on the surface, preventing them from reacting further with the surrounding environment. Marine aluminium alloy plate has good corrosion resistance, and aluminium alloy drill pipe does not corrode even after long-term immersion in saturated CO2 solution. After practical use, aluminium alloy drill pipe can effectively prevent H2S and CO2 corrosion at any temperature.

Aluminium alloy has been used in the shipbuilding industry for nearly 100 years. With the rapid development of the shipbuilding industry at home and abroad, the light weight of ships is being paid more and more attention to. Due to its low density, high strength and high corrosion resistance, aluminium is well suited to the harsh marine environment. The processing cost of aluminium is lower, thus making it more economical to use aluminium to build ships. From a ship designer's point of view, ships made from marine aluminium alloy sheets are faster and have a longer service life under the same power conditions. As a result, aluminium alloys for ships have advanced rapidly in recent years and offer a wide market for a large number of aluminium materials.

The aluminium alloys for ships are mainly aluminium-magnesium, aluminium-magnesium-silicon and aluminium-zinc-magnesium alloys, which are divided into aluminium alloys for upper outfitting and aluminium alloys for hull structure according to the position used. In the superstructure of the ship, the commonly used marine aluminium alloy plate profile for the portholes is 6063 aluminium alloy, and 6063 and 6061 aluminium alloy profiles are often used for the masts and gangways. In addition, extruded aluminium-magnesium alloys are used for the wall plates, which prevent deformation during welding and at the same time ensure a more rational stress distribution. The hull structure has a high application rate of aluminium-magnesium alloys, of which 5454 and 5052 aluminium alloys are the main materials used in the manufacture of decks.