Why do car wheel screws rust

If you repeatedly disassemble the screws or use bad tools when disassembling the screws, the chrome plating layer on the surface of the screws will be damaged, and once the chrome plating layer is damaged, the cast iron inside will rust.

The wheel hub, also known as the rim, wheel and tire bell, is a barrel-shaped metal part with the inner circumference of the tire supporting the tire and the center mounted on the shaft. There are many types of hubs according to diameter, width, molding method, and material.

The wheels on the market can be divided into two categories: steel wheels and alloy wheels according to the material, both of which have their own advantages and disadvantages.

1) The main advantages of steel wheels are simple manufacturing process, relatively low cost, and strong resistance to metal fatigue.

But the disadvantages are also obvious, such as large weight, large inertia resistance, poor heat dissipation and so on.

2) The advantages of alloy wheels are light weight, high manufacturing precision, high strength, small inertia resistance, strong heat dissipation capacity, good visual effect, etc., and the disadvantages are complex manufacturing process and high cost.

Car wheel screws are made of steel, and rust is inevitable. However, the hub screws are generally treated with galvanized or chrome plating, so as to slow down the process of oxidation and corrosion.

Because after the screw has been screwed several times, the anti-corrosion layer on its surface is destroyed, and its working environment is harsh, so it will rust, and the hub should be kept clean, drying can prevent or reduce rust, be careful not to apply lubricating oil, so as not to have potential safety hazards.

The surface of the hub bolt is chrome-plated to prevent rust.

Repeated disassembly will destroy the chrome plating layer on the surface.

When steel is exposed to air, rain, wading, etc., it will oxidize and rust.

It should be kept as dry and clean as possible to prevent or reduce rust.

This is very common and normal, because the brake discs are metal and have no protection, so they are directly exposed to the air, causing oxidation and rust.

If there is only a slight rust on the surface, we can remove it by continuous braking while driving, of course, on the premise of ensuring safety and not affecting public transport.

While driving, gently press on the brakes to "polish" the surface of the friction between the brake pads and the brake disc.

If the rust is severe, we do not recommend using the above method of applying the brakes to remove the rust.

When there is more rust, it will cause the surface of the brake disc to be uneven, in this case, the brake will cause the body to shake, and the driver can clearly feel the abnormality of the brake pedal, steering wheel and the body. At this time, it will be difficult to remove the rust, and even if it is barely "polished", it will cause abnormal wear and tear of the brake pads afterwards, and there will still be shaking.

When it is very serious, it is best to drive the vehicle into the repair shop, remove the brake disc, polish the rust with sandpaper, check whether there is any abnormality on the surface of the brake pad, and conduct a road test after proper installation. Drive at a speed of 70 km/h on a flat road and brake several times to ensure that there is no abnormality. If there is still jitter, it means that the surface of the brake disc is uneven and needs to be further polished and leveled or replaced as appropriate.

The wheel can also rust you are good enough, pay attention to good maintenance is no problem, spray some rust remover in the position that has rusted to wipe the rust off, and then put back a little rust anti-rust paint. Not a big problem.

4S shop professional technician, if it is the outside of the wheel hub rusty place Hello, you have to first make sure that it is **rust, if it is the brake disc inside, remember the brake disc, do not wipe any product, [car problems, please clean it with detergent, 10 minutes to solve, ask the car master.

Normal don't worry, all cars are like that, you take a look at the position of other removed wheels when you maintain in the 4S shop, the rust spots in this position are very serious, and it does not affect the normal driving of the vehicle

Summary. Hello, dear. If there is only a slight rust on the surface, you can use the method of continuous braking while driving to remove it, and when driving, gently press the brake to let the friction between the brake pads and the brake disc "polish" the surface.

If the rust is very serious, it is best to drive the vehicle into the repair shop, remove the brake discs, polish the rust with sandpaper, and conduct a road test after installing it properly. Theoretically, the maximum wear limit of the brake disc is 2 mm, and the brake disc must be replaced with a new one after the limit has been used.

However, in actual use, most car owners do not strictly implement this standard. Look at the frequency of brake pad replacement. If the frequency of replacement of the disc is very high, it is recommended to check the thickness of the brake disc more, after all, if you pay a relatively fast piece, it means that you use a lot of brakes, so you should check the brakes regularly.

I've looked at this place for a few years, and the car won't show up for three months.

Hello, dear. If there is only a slight rust on the surface, you can use the method of continuous braking while driving to remove it, and when driving, gently press the brake to let the friction between the brake pads and the brake disc "polish" the surface. If the rust is very serious, it is best to drive the vehicle into the repair shop, remove the brake discs, and use sandpaper to polish the rust clean, install it properly and let Sakuramori conduct a road test.

Theoretically, the maximum wear limit of the brake disc is 2 mm, and the brake disc must be replaced with a new one after the limit has been used. However, in actual use, most car owners do not strictly implement this standard.

Look at the frequency of brake pad replacement. If the frequency of replacement of the disc is very high, it is recommended to check the thickness of the brake disc more, after all, if you pay a relatively fast piece, it means that you use a lot of brakes, so you should check the brakes regularly.

Hello, dear. Normal emotional stimulation side resistance, the steel ring in the wheel Ming Chun tire is normal to rust, but the surface of the floating rust, because the steel ring Qidan is cast iron, generally does not affect the normal use of the steel ring.

You see, this is not the brake pads, this is the hub joint.

Hello, dear. It is normal for a small area to rust at the junction of the car wheel, which is the part where the axle is installed in the center of the wheel. It is normal for iron castings to rust in rainy and foggy weather or after washing and seeping, and the air is humid, but it will rust when combined with oxygen and water vapor in the air.

Why wouldn't other cars be?

Hello, dear. It is normal for all car castings to rust, especially the wheels and brake discs. It's just that some car owners have an anti-rust spray layer.

Cause of rust of wheels: The original screws are cast with cast iron, although the outer layer is protected by a layer of paint, but with the increase of working time, part of the paint will wear and decolorize, and then when it is poured with water, it will rust. The hub bolt is a high-strength bolt connecting the wheel of the vehicle, and the connection position is the hub unit bearing of the wheel.

Hub screws are classified as follows:

1. Cast iron casting screws, the material is cast iron, most of the original automobile wheel hubs are resistant to screws, which will rust after a long time, and the color is relatively simple, but the cost is low;

2. Cast iron forging screws, the material cast iron, in addition to the color is richer than casting, the others are similar to casting, and the rust is more serious than casting; acres carry.

3. Aluminum alloy forged screws, the material is generally 7075 aluminum, and a small number of high-end automobile original wheel screws use this process, with various colors, lighter weight than cast iron screws, and higher strength than casting;

4. Titanium alloy screws, the material is generally CT4, this kind of screw is expensive, but the performance is indeed much higher than the first 3. Although the first 3 types of screws are also sufficient in terms of use, for the sake of better pursuit, it is also very beautiful to install a set of titanium alloys.

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