Analysis of the chemical properties and corrosion resistance of Brass Plate
Publish Time: 2024-08-28
Chemistry
The main components of brass are copper (CU) and zinc (Zn). The proportion of its alloy composition can change, thereby adjusting its physical and chemical characteristics. Generally speaking, the copper content in brass is usually between 60%and 90%, and zinc content is between 10%and 40%. Different copper zinc ratio will affect the hardness, ductility and abrasion resistance of brass.
In terms of chemical properties, brass is mainly manifested as high antioxidant properties. Both copper and zinc have a certain anti -oxidant ability, but when copper is exposed to the air for a long time, the surface will form a layer of green rust (such as copper green), which is a copper hydroxide or copper carbonate generated by copper and oxygen and moisture. Although this reaction will change the color of the brass surface, it actually forms a protective layer that helps to slow down further corrosion.
The tolerance of brass to the acid -base environment is poor. The acidic environment will accelerate the corrosion of brass, especially sulfuric acid and hydrochloric acid. Bronze may also be corroded in an alkaline environment, although the speed of corrosion is slow. Therefore, brass is usually not suitable for use in a strong acid or strong alkali environment, especially when there is no protective coating.
Corrosion resistance
The corrosion resistance of brass is affected by the alloy composition, surface treatment and environmental conditions. Compared with pure copper, the corrosion resistance of brass has decreased slightly, but its wear resistance and mechanical strength are more prominent. In the wet or salt mogic environment, the corrosion performance of the bronze plate is usually more complicated. This is because salt (chloride ions) can accelerate the corrosion process, especially in the marine environment, the corrosion resistance of brass will be significantly affected.
In order to improve the corrosion resistance of brass plates, surface treatment technology is often used, such as nickel plating, chrome or coating anti -corrosion coating. These treatments can effectively protect the surface of the brass from the erosion of the external environment, thereby extending its service life. For example, the nickel -plated layer can not only improve the corrosion resistance of brass, but also improve its appearance and abrasion resistance.
Another corrosion -resistant strategy of brass is alloy. By adding other elements (such as lead, tin or nickel), it can enhance the corrosion resistance of brass in a specific environment. For example, a small amount of lead (such as free cut brass) can reduce friction heat during processing, thereby reducing the corrosion rate.
