Comparison of advantages and disadvantages between galvanized sheet and aluminum alloy.

Galvanized steel plate (usually referred to as hot-dip galvanized steel plate): low cost, high strength and good load bearing, suitable for structural parts and heavy-duty scenes; However, after the zinc layer is damaged, the substrate will rust (especially in damp, acid rain or coastal environment), with high self-weight and high thermal conductivity. If the coating needs to be maintained after long-term outdoor use, the service life is generally 5-15 years (depending on the thickness and environment of the zinc layer).

Aluminum alloy: natural corrosion resistance (self-healing of dense alumina film on the surface), light weight (about 1/3 of steel), no rust, easy recovery and good processability; However, the strength is lower than that of galvanized steel (which needs thickening compensation), the cost is higher, it may become brittle at low temperature (< -15℃), the wear resistance and hardness are lower, and the performance at high temperature (> 200℃) is degraded.