Metal materials, such as steel and aluminum, will gradually corrode during use. Once corrosion occurs, irreversibility will not only affect the appearance and decoration, but also affect function and safety. Corrosion failure is usually expensive.
According to statistics, one ton of steel worldwide becomes rust every 90 seconds. The economic loss caused by the corrosion of a single vehicle in China each year is more than 100 billion yuan. Corrosion proceeds silently, which will not only shorten the life of the structure, increase repair and maintenance costs, cause downtime, or even cause major accidents such as collapse of building structures, leakage of toxic substances or fire, explosion
According to reports, metal corrosion causes an average annual loss of $ 150 to 250 per car in the world, and the annual loss due to corrosion in the American automotive industry is about $ 20 billion. Surveys of automotive corrosion in Sweden and China between 1985 and 1991 show that, in addition to accidental traffic accidents or part wear and tear, automotive corrosion is an important cause of automobile scraps.
Below are some reasons why a car is corroded:
(1) Structural design is unreasonable, such as welding scars;
(2) Erosion of harmful substances (such as acid and alkali salts);
(3) Corrosion after mechanical damage;
(4) Problems with materials;
(5) Problems in the protection technology;
(6) Corrosion caused by environmental factors (such as high humidity, sunlight and weathering, etc.);
(7) Electrochemical corrosion.
These cause a number of consequences：
Car surface When the car is exposed to humid air, the surface is naturally the most susceptible to erosion, especially the parts with welding points on the door, head cover, and tailgate, which are particularly vulnerable to erosion.
Car chassis The car chassis is also the key part to be eroded. During driving, the car chassis comes in contact with water more and is most likely to rust. The chassis does not see sunlight throughout the year, and moisture can penetrate through the tiny holes in the chassis and rust the body, causing the paint to peel off.
Brake system The failure of the brake system is because the brake fluid easily merges with water. Water vapor accumulates on the brake tank and easily enters the brake fluid. If moisture enters the brake fluid, friction during the braking process The resulting high temperatures can vaporize water.
Car audio system After the speaker and CD get wet, with the increase of humidity, it will be difficult to read the disc when the CD is placed. The car's stereo is easy to get wet from the rain when driving through the window. If the speaker is found to be wet, go to a professional outlet for repair in time.
Car seat The car seat is the part that has the most contact with the human body. Its refreshment or not has the greatest impact on our bodies. The owner of the flannel seat naturally needs to be extra careful. In fact, even a leather seat, In some dark places, it is also susceptible to moisture erosion.
On-board computer system The on-board computer system is also an important component easily eroded by moisture, and each chip of the on-board computer system is particularly "delicate", which is the object of the owner's key protection.
Bearings (wearing more severely due to long-term high-intensity mechanical movements) Some common countermeasures to deal with automobile corrosion: improve the anticorrosiveness of passenger cars (such as welding seam sealant after welding, etc. (Corrosion resistance); the door, bumper and other corrosive parts should be treated with the entire phosphating, electrophoretic primer process; welding of dissimilar metals when forming, easy to cause electrochemical corrosion, should avoid small anode, large cathode phenomenon; Improving the stone strike resistance and anticorrosiveness of the bus primer and skirt, can be coated with anti-corrosion and anti-stone strike glue; use galvanized steel instead of the existing steel, and use phosphating solution, primer, Putty; strengthen daily maintenance; research and develop new materials that resist rust.
