How to identify the anti-corrosion configuration of the chassis when selecting heavy-duty trucks in humid and rainy areas

How to identify the anti-corrosion configuration of the chassis when selecting heavy-duty trucks in humid and rainy areas. In rainy and humid areas, rainwater and mud adhere to the chassis for a long time, and water vapor is easily hidden in the frame interlayer and bolt gaps. In addition, the export shipping salt spray is superimposed, and the chassis is prone to rust spots, ranging from mild rusting of brackets and pipeline joints to severe corrosion and thinning of the frame steel plate, directly shortening the service life of the entire vehicle. When purchasing vehicles, it is not enough to only look at the brightness of the chassis surface paint, but also to identify the anti-corrosion configuration from multiple aspects such as coating process, standard parts, pipeline wiring harness, and structural design. Priority should be given to confirming the anti-corrosion process of the frame foundation. The high-quality solution adopts overall electrophoresis as the base, and a protective film can be formed on the inner and outer walls of the frame longitudinal and transverse beams to avoid water accumulation and rust in the inner cavity. Ordinary simple spraying can only cover the outer surface, and the interlayer of the board is easily corroded from the inside. After electrophoresis, combined with epoxy zinc rich primer and polyurethane topcoat, the coating thickness meets the standard, and it has stronger resistance to moisture and stone impact. The paint surface that is easy to spray paint is thinner, and it quickly exposes and rusts after collision. Next, check the chassis fasteners. Bolts and pin shafts are prone to corrosion in humid environments. Qualified products should use hot-dip galvanized or Dacromet coated standard parts, with uniform coating and less prone to white rust and red rust. Ordinary blackened bolts can rust and die in rainy areas in just a few months, making maintenance and disassembly difficult in the later stages, and the cost of replacing overseas parts is high. Then check the protection of the air circuit, hydraulic pipeline, and wiring harness. The metal parts of the rubber pipeline joints need to be galvanized for corrosion prevention, and the wiring harness plugs must be sealed with IP67 protective joints. The outer layer of the wiring harness should be protected with corrugated pipes to prevent rainwater from infiltrating and causing short circuits. The pipeline fixing bracket cannot be a bare steel part, and the welding seam position of the bracket should also be fully sprayed. The welding seam is a weak point of corrosion, and the missed spraying position will lead to rusting. Attention should also be paid to the chassis drainage structure, with reserved drainage holes on the frame and various brackets to prevent rainwater from accumulating in the enclosed cavity. Many low-priced car models have no drainage holes in the enclosed structure, which can lead to long-term accumulation of water and accelerate internal corrosion. For heavy-duty load-bearing components such as leaf spring supports, lifting lugs, and connecting brackets, hot-dip galvanizing technology is preferred for better protection than ordinary spray painting. Finally, the manufacturer's salt spray test data can be verified, and it is recommended to have at least 500 hours of salt spray without red rust in humid and rainy areas. Many customers only focus on engine horsepower and load-bearing capacity when purchasing, neglecting chassis corrosion prevention. Within less than a year of operation, the chassis has rusted extensively and maintenance work is frequently stopped. For the rainy overseas market, during the procurement stage, it is necessary to verify the anti-corrosion configuration item by item, and prioritize the selection of a complete electrophoresis and multi-layer coating scheme, combined with anti-corrosion fasteners and sealed wiring harnesses, to reduce the risk of chassis corrosion from the source, extend the service life of vehicles, and reduce the maintenance expenses of the fleet in the later stage.