Why are some car brake discs prone to rust, while others are less likely to rust?
Mar 27,2023
Do some car brake discs rust easily? In fact, the brake discs of most cars will rust, because as long as they are made of steel, they will rust. And almost 95% of the brake discs on the market are made of steel, so they will rust. Very few high-end cars have ceramic ones. Brake discs, carbon ceramic brake discs and carbon carbon brake discs, of course the latter two already belong to the category of supercars.
In fact, very few cars have ceramic plates! Brake discs are divided into carbon fiber ceramic brake discs and metal (cast iron) brake discs according to different materials. We know that carbon fiber ceramic brake discs do not rust, while gray cast iron is prone to corrosion. Of course, carbon fiber ceramic brake discs have poor braking power at low temperatures due to their high production cost. Family cars are rarely used, so the reason for the material may be relatively minor.
However, in order to increase the heat resistance, some manufacturers process metal brake discs into carbon fiber. Combining the advantages of both, this kind of brake disc is not easy to rust. Our ordinary cars basically use semi-metallic brake discs, but there is a phenomenon that everyone I was looking at both German and American cars being washed, but when the cars were cleaned, the brake discs were rusty.
Whether there will be brake discs, but this does not mean the quality of the car. It mainly depends on the requirements of different car manufacturers for car production and driving experience, and the choice of brake disc materials. Ceramic brake discs, these brake discs are all super Run equipped.
Ceramic brake discs are not ordinary ceramics, but carbon fiber and silicon carbide synthesized at a high temperature of 1,700 degrees. The biggest advantage of reinforced composite ceramics is that they can effectively resist thermal decomposition, have excellent braking effects when driving at high speeds, and have better heat resistance than ordinary brakes. The discs are many times higher, but the price is dozens of times higher than the cast iron brake discs, generally tens of thousands.
The current anti-corrosion technology is nothing more than painting, surface treatment, electroplating, chemistry, cathodic anti-corrosion and other methods, while the anti-corrosion of the car body is nothing more than the "painting" process, galvanizing or spraying oil on the body, and isolating the oxidation reaction of the chassis and other items, but they Can it be used on brake discs?
Of course not, this is where friction often occurs. If the material is not replaced, no matter how thick the coating is, it will wear away, let alone reduce friction. Cars that have not been used for a long time are most likely to rust, because the brake discs that have not been used for a long time will rust. If there is a lot of dust on the brake disc, vacuum it. Over time, the dust that falls on the brake disc will absorb moisture from the air.
When exposed to oxygen in the air, an oxidation reaction will occur, which we call rust. Iron is easily oxidized when there is sufficient air (oxygen) and moisture. Of course, a car that has not been used for a long time will be parked in a humid, pH-rich environment. High places are also prone to rust.
In fact, it is not that some brake discs are not good at braking, but that some people use their cars more, such as those friends who commute to get off work every day, so their brake discs have no chance of rusting, right? For a car that is not used often, its brake discs will often rust in this rusty weather. This is normal.
As long as the car is used again, the rust will be removed automatically, no problem, so it is not that some brake discs are of good quality and do not rust as the questioner said, but it is directly related to the use environment. Generally speaking, the quality of the brake discs Rust has little effect and can actually be wiped off by applying the brakes a few times while driving.
When the brake disc is severely rusted, normal braking cannot achieve a perfect rust removal effect. When the brake disc is extremely rusted, it will cause the surface of the brake disc to be uneven. In this case, braking will cause the car body to shake, and the car owner will obviously feel If there is an abnormality in the steering wheel, body or brake pedal, if you encounter this situation, you have to go to a specialized workshop to remove the rust from the brake disc.
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