Why Do the Welding Points in the Trunk Drainage Channel Rust?
1 Answers
Rust on the welding points in the trunk drainage channel is caused by high-temperature oxidation. Detailed explanation of the reasons for rust on the welding points in the trunk drainage channel and solutions are as follows: The high temperature generated during welding promotes rust formation at the welding points, as it damages the anti-rust layer; humid air also accelerates oxidation and rust; potential issues with the factory anti-rust coating process; whether the trunk drainage channel has undergone repairs; and the parking environment of the vehicle. Solutions: Applying anti-rust paint: For steel structures that have undergone anti-rust treatment, the welded areas should be coated with anti-rust paint to ensure protection and maintain a uniform decorative effect. The type of anti-rust paint should match the original coating used on the steel structure. Common options include epoxy zinc-rich primer, red lead anti-rust paint, and iron red alkyd anti-rust paint. During application, the welded areas, fusion zones, and heat-affected zones must be thoroughly cleaned by grinding to remove welding slag and existing paint. Then, select the appropriate anti-rust paint based on environmental factors like temperature and humidity; Acid pickling and passivation: Metal passivation involves using strong acids or similar substances to chemically react with the metal surface, forming a dense passivation film for rust protection.
