The external anti-corrosion solution of super-long bolts is the most common way of application. Super-long bolts are made of metal, and metal corrosion protection methods refer to four aspects: material properties, application environment, interface between data and environment, and design solutions for improving metal structures. If the super-long bolts are made of a solid corrosion-resistant aluminum alloy, unless there is a special requirement, this is not the case in terms of economic definition. In fact, it can be difficult to distinguish the appearance of the screw from the environmental factors that cause corrosion. Improving the design of the metal structure can improve the damage of special conditions under certain circumstances, but the design of most stainless steel screws cannot be adjusted effectively, and its maintenance effect is not long-term, so this method cannot basically solve this problem , Only the anti-corrosion on the page, that is, external anti-corrosion, is the most common way now. The extra-long bolts maintain the layer function. The external anti-corrosion treatment of super long bolts and screws refers to the use of various methods to protect the metal surface. Its function is to protect the metal from the corrosive environment to prevent the corrosion process or reduce the contact between the corrosive substance and the metal surface, thereby preventing or reducing corrosion. The maintenance of super long bolts should meet the following requirements: 1. Corrosion resistance, wear resistance, high toughness. 2. Close structure, detailed and porous structure. 3. Excellent peeling and fusion with base metal. 4. Mean particle size distribution and thickness. Generally, there are two anti-corrosion methods for super long bolts: metal coating and non-metal coating. Metal coating refers to the use of metals or aluminum alloys with strong corrosion resistance to form a protective layer on the surface of easily corroded metals. Such coatings are also referred to as coatings. There are many ways of metal platingAnd types, the most common of which is the electroplating process.