Comparison of two practical processes for anti-corrosion treatment of new cars going abroad

During the ocean shipping of new heavy-duty trucks, they are exposed to high humidity, salt spray, and sealed environments for a long time. The chassis beams, welding joints, and interior of the vehicle are prone to rusting, which directly affects the acceptance of the new vehicle and the service life of the entire vehicle. At present, the mainstream anti-corrosion methods for heavy-duty trucks going abroad are cathodic electrophoresis anti-corrosion and internal wax spraying anti-corrosion. Both have their own advantages and disadvantages in terms of protection principles, applicable parts, and protection life. Many overseas customers, due to their lack of understanding of process differences, have inadequate anti-corrosion solutions, resulting in problems such as rusting and paint peeling after the vehicles are shipped by sea, leading to vehicle depreciation. This article will compare two practical overseas anti-corrosion processes to help customers accurately select according to their needs.
Cathodic electrophoresis anti-corrosion is a basic and rigid anti-corrosion process that comes standard with heavy-duty trucks at the factory, and is a pre protective measure. This process utilizes the action of an electric field to evenly adsorb the anti-corrosion paint onto the metal surface of the frame, forming a dense and hard protective paint film after curing, fully covering the outer wall, corners, and welding joints of the beam, effectively isolating salt spray, moisture, and metal contact. Its core advantages are strong adhesion of the paint film, wear resistance, resistance to peeling and detachment, excellent salt spray resistance, and a corrosion resistance life of 3 to 5 years under normal working conditions. It can fully preserve the appearance of the new car and meet the basic overseas acceptance standards. Simultaneously, the construction is environmentally friendly and the paint surface is smooth and uniform, suitable for the basic protection needs of various export heavy trucks. The biggest weakness of this process is the blind spot of protection, which can only cover the exposed surface of the vehicle body and cannot penetrate the closed inner cavity of the main beam, interlayer gaps, and dead corners of the pipeline. These hidden parts are high-risk areas for maritime corrosion, and electrophoretic technology alone cannot achieve comprehensive protection for the entire vehicle.
The internal wax spraying anti-corrosion is a rear reinforcement process exclusive to new cars going abroad, perfectly compensating for the protection shortcomings of electrophoresis technology. This process uses high-pressure equipment to inject liquid penetrating anti-corrosion wax from the reserved holes on the vehicle body, which can penetrate into all hidden corners such as the inner cavity of the beam, gaps, and welding blind spots. After air drying, it forms a flexible hydrophobic protective layer, effectively blocking salt spray and water vapor penetration. Its biggest advantage is the no dead corner protection, which specifically solves the problem of hidden rust inside the car body. The flexible wax layer can adapt to the deformation of the chassis bumps, without cracking or falling off, and can efficiently resist white spot rust and internal cavity rust during sea transportation. Simultaneously, convenient construction, high cost-effectiveness, and quick protective effects are essential anti-corrosion and reinforcement solutions for ocean freight vehicles. The disadvantage is that the wax layer has a soft texture, which is easily contaminated with dust, sand and gravel, and has a short protection life, with an effective protection period of 1 to 2 years. It focuses on short-term high-strength maritime protection.
The two anti-corrosion processes are not a substitute relationship, but a complementary golden combination. The electrophoresis process focuses on long-term external hard protection, ensuring the integrity of the vehicle's appearance and long-term corrosion resistance; The wax spraying process focuses on flexible protection of internal dead corners to solve the core corrosion pain points in maritime transportation. In actual overseas selection, for short distance sea transportation and export vehicles to dry areas, the original electrophoresis process can meet the basic protection requirements; For heavy-duty trucks in coastal countries with long-distance ocean travel, high salt spray, and humid and hot weather, a dual anti-corrosion process of "electrophoresis+whole vehicle wax spraying" must be adopted. Double protection can cover the inside and outside of the vehicle in all directions, completely avoiding the hidden dangers of maritime rust, ensuring that the new car is in good condition upon landing, reducing maintenance costs in the later stage, and effectively improving the vehicle's overseas resale value and attendance rate.