Will the Car Chassis Rust When Driving in Rainy Days?
2 Answers
As long as the car body is made of metal, it will undergo oxidation reaction with oxygen in a humid environment, leading to rust. To prevent rust, the following measures should be taken: 1. Block direct contact between metal and air: Manufacturers use primer and topcoat to protect the entire car body, completely isolating the metal from oxygen. Currently, electrophoretic primer and electrostatic mechanical spraying processes are widely adopted to minimize dead corners that manual spraying cannot reach. 2. Improve the purity of the metal as much as possible: Conductive impurities in the metal are the root cause of electron migration, and differences in potential will lead to electrolytic reactions, resulting in rust of the metal acting as the negative electrode. Therefore, metals with higher purity are less prone to rust. Mazda cars install zinc plates in areas prone to corrosion on the car body, using the zinc plate with lower potential as the negative electrode. After rusting, timely replacement of the zinc plate can delay the rusting of the car body steel, achieving the goal by transferring the negative electrode of the electrolytic reaction.
Honestly, it's quite common for car chassis to rust on rainy days. Rainwater contains impurities and acidic substances that can seep into chassis gaps, accelerating metal corrosion. After driving for several years, I've noticed the chassis always stays damp after rain, especially on older models without rust-proof paint - once rust spots appear, they're hard to control. Most modern cars come with protective coatings from the factory, but if road pebbles chip off even a small section, rainwater can cause serious damage. A friend's car ended up with a rusted-through exhaust pipe from long-term neglect of small rust spots, costing thousands in repairs. I recommend checking the chassis before and after rainy seasons, and using a high-pressure hose to clean dirt from hard-to-reach areas after car washes to extend its lifespan. Chassis rust isn't just unsightly - it affects safety too, like when rusty suspension systems cause instability during braking. Don't underestimate this; developing good maintenance habits can save both hassle and money.
