There is a clear gap between above-ground parking and underground garage parking.

There is a clear gap between above-ground parking and underground garage parking.

I don't know why people always say that cars are not afraid of the sun. Are they confident enough about modern car-making technology or are they just talking about it? The car is afraid of being exposed to the sun for a long time, and it is parked on the ground and in the underground garage respectively. After a few years, there will be four obvious gaps.

First, the most easily overlooked "bird droppings"

There seems to be no harm in bird droppings. In fact, they are far more destructive than sun exposure. Of course, the aging and cracking of car paint is also the result of many factors. Let's talk about why bird droppings are so destructive.

First, the excretory system of birds can convert their digestive proteins into uric acid. Feces contain urate, phosphoric acid, ammonium, carbonate, oxalic acid and other substances. Uric acid in guano is acidic and corrosive. Some ammonium, salt and acid react chemically when they are wet or water, which is very corrosive and can be said to be natural "natural enemies" of metals.

Second, it is easy to ignore ultraviolet rays. The main components in car paint are amino resin, hydroxyl resin or acrylic resin, and acrylic resin is naturally afraid of ultraviolet rays. The ultraviolet rays in my city are very strong, and the direct sunlight time during the day exceeds 10 hour. Over time, the varnish layer on the surface of car paint is easy to be destroyed, and the varnish layer itself is anti-oxidation and anti-corrosion. Once damaged, the damage is self-evident.

In fact, only the sun exposure has little effect on car paint. Now the car-making technology is relatively mature, and the car paint needs more complicated technological processes, such as four basic processes: electrophoresis layer, intermediate coating, color paint layer and varnish layer. In the electrophoretic layer stage, car paint needs to be baked at a high temperature above 200 degrees Celsius for a long time.

Car paint will also be tested in various extreme environments. For example, some car companies will expose car paint according to QC/T 728-2005 (Test Method for Atmospheric Exposure of Vehicles). Therefore, compared with exposure, it has little effect on car paint.

But the acidity of bird droppings, the destruction of ultraviolet rays, and the combination of sun exposure, acid rain and dust. Even if the anti-oxidation and anti-corrosion performance of car paint is good, it can't stand their long-term damage. Over time, the surface of car paint is constantly oxidized and the color gradually declines. More serious car paint may appear yellowing and cracking. Of course, different models will be different according to the price, painting process and so on.

Second, the loss of automobile tires is obvious.

After a long period of sun exposure, rubber is prone to aging and embrittlement, especially the tire surface is prone to cracking. Although the tire needs to undergo a strong vulcanization process in the manufacturing process, its chemical bonds are suspected of energy, such as strong ultraviolet rays in winter and summer, which will break the molecular chain and thus reduce the strength of the tire.

The temperature difference between day and night is large, the tire expands with heat and contracts with cold, the ground parking every day, acid rain, dust and so on aggravate the rubber aging. Generally, the service life of tires is about 3-6 years or the mileage reaches 40,000-80,000 kilometers. If the daily environment in the car is not good and the maintenance is not good, the service life of the tire will almost be halved.

The daily tire pressure is also very important. Too high tire pressure will accelerate the wear of the middle position of the tread, and too low tire pressure will accelerate the wear of the shoulder position. If the tread wear has reached the wear mark (the raised mark in the groove on the tread surface), it is time to replace the tire.

Third, the damage inside the car.

The sun is exposed in summer and winter, and the temperature inside the car can be as high as sixty or seventy degrees Celsius. Some riders have done experiments and put open eggs in. After two hours, the eggs gradually turned into fried eggs, so you can imagine how hot it was.

Automobile center console, front and rear windshield partitions, seats, etc. Use a lot of plastic parts, silica gel, coated fiber skin, plastic lining technology, etc. These materials are often exposed to the sun and are prone to deterioration, aging and cracking. Under the exposure of the sun, many molecular chains containing polymer materials were destroyed, which accelerated the fading, aging and performance degradation of the interior. Of course, different models have different materials and materials, and the aging speed is also different.

Four, damage to automobile seals, parts.

Exposure, wind and rain have certain effects on the rubber strips and sealing rings of vehicle doors and windows, such as cracking and aging of rubber strips, obvious stiffness when closing doors and opening and closing windows, poor sound insulation effect and even water ingress.

After the rain, the vehicle is wet and the interior is easy to get moldy. In some places, places where paint is scraped off, places where sheet metal is repaired, chassis and other places are prone to rust. In particular, various electronic components are prone to circuit failures due to moisture and water.

Precautions for car use in hot weather in summer:

1, perfume, lighters, charging treasures, mobile phones and other items must not be placed in the car. Butane liquid in lighter is easy to explode when the temperature exceeds 55℃. Perfume contains a certain amount of alcohol, which is easy to volatilize, expand or even explode in high temperature air.

Don't get on the bus after a long exposure. The temperature inside the car is high, and it will give off an unpleasant smell after being exposed inside, which contains harmful gases. At this time, first open the door for ventilation, then open the external circulation, and then start the vehicle after the temperature drops.

Sun protection measures for automobiles:

First, use sun visors, mainly front and rear windshields. You can choose some sun visors that can block ultraviolet rays, so that the car will not be very hot and help prevent the interior from aging.

Second, car waxing, car waxing has many functions, such as effective heat insulation, anti-ultraviolet, anti-acid rain erosion, anti-static, protective varnish layer and so on. Of course, the cycle after waxing is generally only about 2-4 months, and the cost is higher than that of sun visor, and its price varies according to the model and waxing function.

The third way is to stick heat insulation film, install sunshade and use car clothes. The popularity of car clothes in the past few years has gradually decreased in recent years, mainly because it is more troublesome and the concept of car maintenance has begun to change.

It is true that cars are afraid of exposure, but normal exposure will not cause obvious damage to vehicles. Only when exposed for a long time, the loss of vehicles will be more obvious.

The car itself belongs to consumables. From the moment you buy it back, it means that it will have all kinds of natural wear and tear, which is inevitable. However, it is not easy for ordinary families to save money to buy a car. If they cherish it, they should take corresponding protective measures every day.

If you completely ignore it, the interior will age in three to five years and look disgusting. If we repaint the car, replace the interior, maintain the skylight, replace the tires, batteries and other parts, it is also a big expense.

From the economic cost of maintenance, although the ground parking space is cheaper, the loss cost of long-term parking on the ground is far greater than that of the underground garage. Even if you don't buy a parking space, you can rent an underground parking space, which is cost-effective in any case.

In a word, the car is not as fragile as imagined, and it does not need deliberate or excessive maintenance. Pay attention to avoid common sense mistakes and maintain them normally.