[China Aluminum Industry Network] In general, the basic types of industrial aluminum aluminum corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, filament corrosion. The following briefly describes these types of corrosion.
1. Point corrosion corrosion, also known as hole corrosion, is an extremely localized form of corrosion on the metal that produces needlepoints, dots, and holes. Aluminum can cause pitting in the atmosphere, fresh water, and neutral aqueous solutions. Severely, it can also lead to perforation, but the corrosion hole may eventually stop developing, and the amount of corrosion is kept at a limit value. Pit corrosion is a unique form of anode reaction and is an autocatalytic process.
2. Galvanic corrosion Galvanic corrosion is also a characteristic corrosion pattern of aluminum. The natural potential of aluminum is very negative. When aluminum is in contact with other metals, aluminum is always at the anode to accelerate corrosion. Galvanic corrosion, also called bimetallic corrosion, is determined by the relative position of two metal potential sequences.
3. Crevice Corrosion Crevice corrosion is the result of differential gas-filled cells, which leads to accelerated corrosion within the crevice, and no effect outside the crevice. Crevice corrosion has little to do with the type of alloy. Even very corrosion resistant alloys can produce crevice corrosion. In recent years, the mechanism of crevice corrosion has been further studied, and the acid environment at the top of the gap is the driving force of corrosion.
IV. Intergranular corrosion Intergranular corrosion refers to the fact that pure aluminum does not produce intergranular corrosion. Intergranular corrosion is related to improper heat treatment. Alloying elements or intermetallic compounds precipitate along the grain boundaries and form corrosion with respect to the grains. The battery causes accelerated intergranular corrosion.
5. Filament corrosion Filament corrosion is a kind of corrosion under the film and it develops in the form of worms under the film. This kind of film can make the paint film, and it can also make other layers, generally does not occur under the anodized film.
Ball bearings consist of a series of round balls in a casing, within an inner and outer ring capable of supporting both radial and axial (thrust) loads. Ball bearings come in both single and double row configurations, in both metric and inch sizes, and can be found in a large range of applications from door hinges to roller skates.
Types of Ball Bearings
There are a number of different types of ball bearings, such as miniature, deep groove, and super precision.
Miniature Ball Bearings are small bearings with bore sizes between 1 and 10 mm or up to half an inch. Bearings Direct offers a number of miniature ball bearings in both metric and inch sizes that meet ABEC7 precision class.
Deep Groove Ball Bearings are incredibly versatile and the most widely used. Due to their low friction, they are capable of high rotational speeds, supporting both radial and axial loads. Bearings Direct offers both in metric and inch sizes , also we stock stainless steel made materials metric and inch sizes
Super Precision Ball Bearings are specifically designed with accuracy in mind for high-speed and precision applications. They are capable of high rotational speeds with low friction and noise.
Precision Angular Contact Ball Bearings carry combined loads, both radial and axial, designed, much like the super precision bearings, for high-speed and high-precision applications.
Double Row Ball Bearings are similar to both precision angular contact and super precision ball bearings in that they can accommodate a combined radial and axial loads. These bearings have two rows of balls inside making them capable of much higher loads. Bearings Direct supplies double row ball bearings that are open and with shielded or sealed closures.
Self-Aligning Ball Bearings are double-row ball bearings that can adapt to both static and dynamic angular misalignment. These bearings are particularly appropriate when shaft and housing alignment is a challenge.
Thrust Ball Bearings are ball bearings that can carry axial loads alone. Bearings Direct supplies thrust ball bearings that are single row, in both miniature and regular three-piece configurations.
Bearings Direct supplies all of these ball bearings and you can browse our inventory and purchase online using the links below.
Ball Bearing,Self-Aligning Ball Bearings,Pressure Ball Bearing,Thin-Walled Bearings
Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.lsjgbearing.com