aluminum-zinc plate is composed of 55% aluminum, 43.5% zinc and a small amount of other elements. Microscopically, the surface of the aluminum-zinc coating has a honeycomb structure, and the "honeycomb" composed of aluminum contains zinc. In this case, the aluminum-zinc coating also plays the role of anode protection, but on the one hand due to the reduction in zinc content, and on the other hand because the zinc material is wrapped in aluminum and is not easy to electrolyze, the role of anode protection is greatly reduced. Therefore, once the aluminum-zinc plate is cut, it will rust quickly when the cutting edge is basically lost. Therefore, aluminum-zinc plates should be cut as little as possible. Only after the cut edges are protected with anti-rust paint or zinc-rich paint can the service life of the plate be extended.