The corrosion resistance of magnesium alloy forgings in Marine engineering equipment is discussed in this paper. First, the corrosion characteristics of Marine environment are introduced, then the corrosion behavior and mechanism of magnesium alloy forgings are analyzed, and then the methods to improve its corrosion resistance are discussed. Finally, the application prospect of magnesium alloy forgings in Marine engineering equipment is summarized.
Marine engineering equipment is an important tool for human utilization of Marine resources, and the equipment soaked in seawater for a long time will be seriously affected by corrosion. Therefore, selecting a material with excellent corrosion resistance is of great significance for the long life and safety of Marine engineering equipment. Magnesium alloy, as a kind of lightweight and high-strength metal material, has potential application value in Marine engineering equipment. This paper focuses on the corrosion resistance of magnesium alloy forgings in Marine environment.
The Marine environment is a corrosive environment with high salinity, high humidity and rich in various ions. Active ions such as chloride ions in seawater will accelerate the corrosion process of metals, and dynamic factors such as waves and tides will also cause erosion and corrosion of equipment. Therefore, Marine engineering equipment needs to have excellent corrosion resistance to meet these challenges.
Magnesium alloys are prone to corrosion in the Marine environment, mainly due to the high activity of magnesium, which is easy to react with chloride ions in seawater. Corrosion processes usually include pitting corrosion, intergranular corrosion and stress corrosion cracking. It is important to understand the corrosion mechanism of magnesium alloy to improve its corrosion resistance.
In order to improve the corrosion resistance of magnesium alloy forgings in the Marine environment, the following methods can be adopted:
Alloying design: By adding alloying elements, the microstructure and electrochemical properties of magnesium alloy are changed to improve its corrosion resistance.
Surface treatment: coating, anodic oxidation and other surface treatment technologies are used to isolate the contact between magnesium alloy and seawater and reduce the corrosion rate.
Forging process optimization: optimize forging process parameters, refine grains, improve the mechanical properties and corrosion resistance of magnesium alloys.
Cathodic protection: The cathodic protection technology is used to reduce the corrosion rate of magnesium alloys by means of impressed current or sacrificial anode.
Although there are some corrosion problems of magnesium alloy forgings in Marine environment, the corrosion resistance can be significantly improved by alloying design, surface treatment, forging process optimization and cathodic protection. Therefore, magnesium alloy forgings have a good application prospect in Marine engineering equipment, especially in the structural parts requiring light weight and high strength, it has the potential to replace traditional metal materials. In the future, with the continuous progress of magnesium alloy technology, it is believed that its application in Marine engineering equipment will be more and more extensive.
In this paper, the corrosion behavior and mechanism of magnesium alloy forgings in Marine environment are analyzed, the methods to improve its corrosion resistance are put forward, and its application in Marine engineering equipment is prospected. Magnesium alloy forgings, as a kind of lightweight and high-strength metal material, have the potential to play an important role in Marine engineering equipment after appropriate protective measures are taken. Further research and development will help to realize the wide application of magnesium alloy forgings in Marine engineering equipment.
