Most military vehicles have complex structures. In addition to steel and alloys, there are many non-metallic materials such as rubber and plastics. There are different degrees of corrosion and aging during storage and use. In addition, the engine and electronic components of the vehicle The corrosion conditions of special parts such as parts, a large number of joints and welds are also different. This requires that when choosing anti-corrosion materials and technologies, the performance parameters of different materials, the purpose of the vehicle, the use environment and the material in the environment should be considered. Corrosion data has a comprehensive understanding. Appropriate anti-corrosion materials and technologies must be adopted for each material and component to adapt to the service life of the vehicle design and the planned shutdown maintenance schedule, and try to make all parts of the material uniformly aging and overall performance degradation. For this reason, it is necessary to strengthen the application research of various new anti-corrosion materials and technologies to meet the requirements of military vehicles.

1 　 Application of new anti-corrosion coating

The use of various long-lasting anti-corrosion coatings to improve the anti-corrosion ability of vehicles is simple and effective. For example, the US Navy has adopted a new anti-corrosion coating on TF-41 engine blades, which reduces the scrap rate from 25% to 1 %.

At present, some anti-corrosion coatings used in military vehicles are still relatively backward, and their performance cannot meet the requirements for use. Moreover, the variety of coatings used is relatively single, and corresponding coatings are not used for some special needs of parts, including high-temperature resistant coatings, special coatings for plastics and rubber, special coatings for aluminum alloys, and PVC underbody coatings. For example, the vehicle chassis mostly uses ordinary asphalt enamel, which has poor stone-strike resistance and salt spray resistance, which causes large-area corrosion of the vehicle chassis; the silicone high-temperature resistant coating used in the exhaust pipe cracks and peels off soon after use (See Figure 1); Some paints painted on stainless steel structures have a large area of shedding due to poor adhesion to the stainless steel substrate (see Figure 2). In order to improve this situation, we have conducted a comprehensive understanding of the various anti-corrosion coatings available on the market and conducted comparative tests. The results are not very satisfactory, especially the high-temperature and salt-spray anti-corrosion coatings, stone-strike anti-corrosion coatings, high Elastic anti-corrosion coatings, salt spray anti-corrosion coatings with good adhesion to rubber and stainless steel, etc., cannot meet the requirements of vehicles.

2 　 Application of sealing material

The corrosion of military vehicles is partly caused by inadequate structural sealing. Therefore, in the vehicle manufacturing process, attention should be paid to the use of various sealing materials. If used properly, it will have a multiplier effect on vehicle corrosion. Commonly used sealing materials can be divided into windshield sealant, spot welding sealant, joint glue, edge-folding glue, and various sealing strips and gaskets according to different uses. For example, seals should be added to the door, side windows, and ventilation windows, and then an appropriate amount of windshield sealant should be injected with a glue injection machine to effectively prevent the penetration of corrosive media such as water vapor and salt spray. However, the rubber sealing strip used has poor high temperature resistance, and often deforms and shrinks during use, resulting in poor sealing of doors and windows, and infiltration of corrosive media to accelerate the corrosion of metal parts in the vehicle. Therefore, it is very important to correctly select the sealing material during use. For example, due to the inadequate sealing of the engine muffler and the ingress of corrosive media such as rainwater, a vehicle has rust marks in the shelter. The main reason is that the sealing gasket has been ineffective for a long time, resulting in a structural seal. Another example is a vehicle produced by a factory, which uses PU sealant to close the gaps in the external structure of the vehicle (see Figure 3) to prevent the penetration of corrosive media, thereby effectively preventing vehicle corrosion.