The surface coatings of lamp posts are not uniform. Common types include hot-dip galvanizing layers, powder coating (spray painting), baked paint, and anodic oxide films on aluminum alloys. These materials exhibit varying properties such as hardness, elasticity, adhesion, and wear resistance, necessitating tailored protection strategies.
For hot-dip galvanized lamp posts, their surface consists of a zinc metal layer with relatively low hardness, and the coating is metallurgically bonded to the steel substrate. The primary focus of protection lies in preventing scratches and zinc layer peeling. During straightening operations, in addition to using rubber-clad fixtures, special attention must be paid to temperature control throughout the process. Avoid generating excessive heat through localized intense friction, as elevated temperatures may compromise the microstructure of the galvanized layer. Although the sacrificial anode protection mechanism remains effective when the hot-dip galvanized layer is scratched by sharp objects, its visual appearance and localized protective performance will deteriorate. Therefore, direct contact with any sharp tools must be strictly prohibited during operations.
For spray-painted lamp posts, their surfaces feature polymer coatings that exhibit excellent weather resistance and vibrant colors. However, these coatings may lack the hardness of metal plating layers, making them more susceptible to scratches, and plastic powder could soften under high temperatures. The primary task in protecting spray-painted coatings is to prevent scratches from hard objects and maintain surface smoothness. Protective pads at all contact points must be kept clean and free of impurities. Additionally, attention should be paid to whether force-induced substrate deformation may cause coating cracking. Spray-painted coatings have limited adaptability to substrate deformation (extensibility), and excessive bending corrections may lead to brittle cracking on the convex side. Therefore, correction should be performed at a slower pace, with immediate inspection after adjustment to check for whitening (stress whitening) or micro-crack formation in the coating.
Aluminum alloy lamp posts and their anodized coatings exhibit high surface hardness but are relatively brittle, while the post material itself remains soft. The key to protection lies in preventing localized stress concentration. The clamping fixture's rubber coating layer requires increased thickness and enhanced elasticity to maximize contact area and ensure uniform pressure distribution. Extra caution is essential during straightening operations, as aluminum alloys have low yield strength and are prone to plastic deformation. Excessive substrate deformation may cause mesh-like cracks in the hard and brittle oxide coating. Therefore, equipment for aluminum alloy lamp post straightening must incorporate highly sensitive pressure feedback systems and precise displacement control mechanisms.Cutting Equipment, Welding Equipment,Straightening Equipment,straightening machines.
