Ship-use mg alloy screws

Marine magnesium alloy screws

Marine magnesium alloy screws have the characteristics of corrosion resistance and resistance to seawater erosion, and can be used for a long time in harsh marine environments. They are suitable for shipbuilding and maintenance.

Marine magnesium alloy screws are generally made of AZ31B magnesium alloy with good seawater corrosion resistance. Its chemical composition is: aluminum 3.0-3.5%, zinc 0.7-1.3%, manganese 0.2-1.0%, magnesium balance. The alloy has the characteristics of low density, high strength, good rigidity, excellent corrosion resistance, and good machinability.

The main mechanical properties of marine magnesium alloy screws are as follows:

Tensile strength: ≥260MPa

Yield strength: ≥160MPa

Elongation: ≥6%

Hardness: HB60-75

The specifications of marine magnesium alloy screws adopt common international standard sizes.

Diameter: M4-M20

Length: 10mm-200mm

Thread pitch: 0.5mm-2.5mm

Head type: hexagon head, flat head, round head.

The following methods can be used for post-processing of ship-use magnesium alloy screws:

Anodizing treatment: Forming a dense oxide layer on the surface to improve corrosion resistance and mechanical properties. It can also increase surface hardness and wear resistance.

Electroplating treatment: Depositing metal coatings of different materials, such as chromium, nickel, zinc, and copper, by electroplating, to enhance corrosion resistance and appearance quality.

Spray coating treatment: Spraying specialized protective coatings to reduce corrosion and abrasion on the surface of screws and improve appearance quality.

Hardening treatment: Creating a hard film on the surface by heating and cooling, which improves wear resistance and service life.

Chemical treatment: Such as alkali phosphatization and passivation treatment, to improve surface characteristics.