The coatings sprayed by Arc Spraying Machine can be classified into the following categories based on their functions.
1.Anti-corrosion coating
Depending on the different corrosive environments, different spraying materials should be selected to obtain arc spraying coatings. For instance, the main spraying materials resistant to atmospheric and immersion corrosion environments include Zn, Al, ZnAl15, AlMg5 and rare earth aluminum, etc. The main spraying materials resistant to immersion corrosion by chemical media such as acids, alkalis and salts are various stainless steels and alloys.
2.Wear-resistant coating
This coating mainly includes adhesive wear resistance, surface fatigue wear resistance coating and erosion resistance coating. Among them, in some cases, there is a distinction between coatings resistant to low-temperature (< 538℃) wear and those resistant to high-temperature (538-843℃) wear.
3.High-temperature resistant and anti-oxidation coating
This coating includes coatings applied in high-temperature processes (including oxidizing atmospheres, corrosive gases, erosion above 843 ° C and thermal barriers) and molten metal processes (including molten zinc, molten aluminum, molten iron and steel, and molten copper), which can improve the high-temperature performance of the base material, enabling it to withstand high-temperature chemical or physical dissolution processes as well as mechanical damage erosion processes. Or adapt to both. To prevent the substrate from being damaged by high-temperature oxidation, these coatings can prevent oxygen in the atmosphere from diffusing into the substrate and the rapid diffusion of the coating material itself into the substrate. The melting point of the coating material should be higher than the service temperature, and it should also have a relatively low vapor pressure at the service temperature. The applicable spraying materials include nickel-chromium alloy, nickel-chromium aluminum alloy, etc.
4.Conductive and resistive coatings
This coating is used for conductivity, resistance and shielding.
5.Restore the size coating
This coating is used for iron-based materials (machinable and grindable carbon steel and corrosion-resistant steel) and non-ferrous metals Nickel, cobalt, copper, aluminium, titanium and their alloys products.
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6.Mechanical component clearance control coating
This coating is abrasive.
7.Decorative coating
This coating is mainly used as an artistic decorative coating on the surfaces of sculptures, root carvings, murals, rock paintings, handicrafts and concrete buildings.
The practical application of Arc Spraying Machine has a history of several decades. At present, developed industrial countries such as Europe and the United States have widely applied arc spraying of zinc, aluminum and their alloys for long-term protection of steel components, and are constantly developing corresponding equipment and material series, as well as formulating industrial and quality inspection standards Moreover.
8.summary
It has achieved good application results in anti-corrosion projects of large steel structures such as Bridges, gates, offshore oil pipelines, offshore steel piles, oil storage tanks, ship and submarine hulls, water towers, factory chimneys, underground components, radio and television transmission towers, offshore drilling platforms and helicopter landing gears. Arc Spraying Machine is becoming increasingly mature and its application fields are constantly expanding, making it the preferred method for long-term anti-corrosion of large steel structural components today. The advantages and long-term economic benefits of arc spraying machines have been recognized.
