Stents treated with a zinc-aluminum-magnesium alloy coating through a surface finishing process are called zinc-aluminum-magnesium stents. In recent years, these stents have gradually emerged as a rising star in the stent industry, while promoting the environmentally friendly, economical, and sustainable development of the support and hanger industry.
Alloying elements such as aluminum (Al), magnesium (Mg), and silicon (Si) are added to the coating of hot-dip zinc-aluminum-magnesium stents, which greatly enhances the corrosion inhibition effect of the coating. Compared with ordinary galvanized stents, it achieves higher corrosion resistance with a smaller coating weight, and its corrosion resistance is 10-20 times that of hot-dip galvanized stents.
Hot-dip zinc-aluminum-magnesium stents have a denser structure than traditional galvanized stents. Therefore, during stamping, coating peeling is less likely to occur. They exhibit excellent processing performance such as stretching, stamping, bending, and welding even under severe conditions. Moreover, due to the higher hardness of the coating, they also possess outstanding wear resistance and damage resistance.
The coating components around the cut surface continuously dissolve and form a dense protective film mainly composed of zinc hydroxide, basic zinc chloride, and magnesium hydroxide. This protective film has low electrical conductivity and can inhibit the corrosion of the cut surface.
Thanks to its strong corrosion resistance—10-20 times that of ordinary galvanized materials—and the self-healing and protective ability of the cut surface, the service life of zinc-aluminum-magnesium stents can generally reach about 50 years.
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