Magnesium alloy is the most promising "green and environment-friendly material" in the 21st century. With a series of advantages, such as low density, high specific strength and stiffness, good shock absorption, good castability and excellent electromagnetic shielding performance, it has great application potential in automobile, aerospace, low-altitude aircraft, military equipment, 3C products and other fields. In 2029, the market scale of magnesium alloy is expected to reach 10.021 billion yuan, which provides more application opportunities for silver plating technology.
Application field of magnesium alloy silver plating technology
Aerospace field: Magnesium alloy is widely used in aerospace field because of its light weight and high strength. Silver plating can improve its conductivity and corrosion resistance and meet the requirements of high performance.
Communication electronics field: Magnesium alloy has good electromagnetic shielding performance and is an ideal material for the casing of communication electronic equipment. Silver plating process can enhance its conductivity and signal transmission stability. Magnesium alloys can be widely used in the production of high-end mobile devices, such as digital cameras, smart phones, tablet computers and notebook computer casings.
Automobile and transportation field: magnesium alloy is used to manufacture key parts such as dashboard and steering wheel. Silver plating process can enhance its corrosion resistance and prolong its service life.
Biomedical field: Magnesium alloy is widely used in orthopedic implants because of its biocompatibility and biodegradability. Silver plating can improve its surface properties and meet specific medical requirements.
Challenges of High Performance Silver Plating Technology for Magnesium Alloys
The aerospace environment is complex and changeable, including high humidity, strong oxidizing substances, cosmic rays and other factors, which may cause corrosion to materials. After silver plating, magnesium alloy needs to have high corrosion resistance (neutral salt spray test can reach more than 500 hours) and high temperature resistance (at 250℃, it will not change color for several hours) to ensure that aerospace components will not be corroded and damaged during long-term service.
The existing silver plating process of magnesium alloy has some problems, such as uneven thickness, poor adhesion, poor corrosion resistance and poor high temperature resistance. This is because the standard electrode potential of magnesium is very low (-2.37v), the chemical activity of magnesium alloy is very high, and the contact with metal ions in the plating solution will produce fierce replacement reaction, resulting in a loose and rough replacement layer, which seriously affects the bonding force between the coating and the substrate. At the same time, there are a lot of intermetallic compounds in different types of magnesium alloys because of their different composition elements and surface States, which leads to uneven distribution of electrode potential on the substrate surface and increases the difficulty of electroplating and electroless plating. Silver plating on magnesium alloy is a cathodic coating, which has only mechanical protection effect on magnesium alloy matrix and no electrochemical protection effect. How to comprehensively optimize the silver plating technology and process of magnesium alloys is the direction that needs further study.
Major breakthrough in silver plating technology of magnesium alloy
Hefei Huaqing Hi-Tech R&D team deeply explored the interface structure between magnesium alloy substrate and silver plating layer. Through a lot of experimental research and technical innovation on magnesium alloy silver plating process and bath formula, the grain structure of the coating was refined, and the high-quality non-penetrating silver plating layer was deposited without changing the excellent performance of magnesium alloy, which solved many problems in the existing silver plating process of magnesium alloy, such as poor bonding force, uneven coating, poor corrosion resistance and poor high temperature resistance.
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