The hottest automobile corrosion is shocking, and

2022-07-27
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The automobile corrosion is shocking, and the anti-corrosion coating should not be underestimated

automobile corrosion is shocking, and the anti-corrosion coating should not be underestimated

december 27th, 2019

1

automobile is a very important means of transportation in our life. Many consumers tend to pay more attention to the vehicle's shape, power, fuel consumption and other factors when buying a car, but they know little about the anti-corrosion ability of automobiles. We know that the materials used in the manufacture of automobile body, chassis, motor, engine and even small bolts are mainly metal. These parts have been exposed to the atmospheric environment for a long time, and have been in contact with corrosive components such as oxygen, water and pollutants in the atmosphere for a long time. Most of these substances contain acidic components. Corrosive coatings have become one of the topics that many researchers have studied with great concentration. Over time, the corrosion of metal parts is an unavoidable and common problem under various service environment conditions, which not only destroys the appearance of the car, but also directly affects the quality and service life of the car, and even leads to traffic accidents. However, corrosion damage is a slow process, which often takes several years or even longer. Therefore, it is very important to carry out anti-corrosion treatment for automotive metal parts in the design, development and manufacturing

the common corrosion types of automobile parts mainly include spot corrosion, local corrosion, crevice corrosion and corrosion under load

patchy corrosion

patchy corrosion, which is manifested by blistering and falling off of finish paint or coating, exposure of base metal, and appearance of uniformity Figure 1: corrosion or pitting in January 2016, which mostly occurs in the body and chassis. The corrosion is caused by the gas bubbling and stripping caused by the cathodic reaction of the base metal, or the coating falling off caused by the anodic dissolution of the base metal. It is also possible that the paint layer is separated due to sand and stone splashing

local corrosion

local corrosion is a form of corrosion in which an element in the alloy is preferentially dissolved from the speed and precision body of solid solution improvement conditioning, resulting in damage. It often occurs on the surface of stainless steel, aluminum, aluminum alloy, zinc alloy components, tin plated, copper plated, chromium plated nickel parts. For example, due to the dezincification of brass, some instruments on the automobile have become sponge like structures based on copper (4) sample specifications, which sharply reduces the strength of parts and damages them. Pitting corrosion is a form of local corrosion, which forms numerous small holes on the metal surface, which is a particularly dangerous type of corrosion. It can not only make the workpiece perforate and fail, but if under high stress, this corrosion hole may become a fatigue source, causing local damage to expand and produce fatigue fracture, which is quite dangerous in high-speed vehicles, such as automotive transmission gears often caused by pitting corrosion

crevice corrosion

crevice corrosion occurs at the joints of various automobile parts. A car probably has a welding point and many rivet connections. Therefore, the locations of riveting, welding and bolt connection are prone to such corrosion. Crevice corrosion is the most serious and common form of automotive corrosion

corrosion under load

corrosion under load refers to the corrosion of automobile parts under the joint action of mechanical stress and corrosive environment. The necessary conditions for stress corrosion are: first, it is sensitive to an alloy with stress corrosion, such as high-strength steel, brass, etc. Second, in special environments, such as brass and zinc ions, stress corrosion can be caused. Third, there must be tensile stress, which can be residual or applied stress. For example, uneven cooling during heat treatment can produce residual stress, which can lead to the fracture of the automobile chassis girder. This kind of corrosion is hidden and sudden, which is a hidden danger for the safe driving of automobiles. It often occurs in the lower beam of the door, etc

the consequences of automobile corrosion are shocking. In addition to the replacement of new materials and the improvement of new processes, high-performance and multi-functional anti-corrosion coatings are also essential. The high-performance and multifunctional anti-corrosion coating can not only improve the appearance quality of the automobile, but also improve the internal quality of the automobile, resist corrosion and prolong the service life of the automobile. The anti-corrosion coating used has also changed from the traditional type to the environmental protection type. A single variety is multifunctional, that is, a single variety will have many functions such as high-temperature anti-corrosion, high elasticity, anti-static, non-toxic and so on. Such as solar shielding anti-corrosion coating, damping anti-corrosion coating, peelable anti-corrosion coating, weather resistant anti-corrosion polyurethane coating, flame retardant, static conductive, temperature resistant anti-corrosion coating, etc. The demand for anticorrosive coatings with a service life of 10 years or even more and suitable for very harsh corrosion conditions will increase sharply. High performance and multi-functional anticorrosive coatings will be widely used in automobiles

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