Application Of Laser Cladding Technology in Marine Anticorrosion
Mar 15, 2024
The ocean contains rich natural resources. The development of the ocean not only has important economic significance, but also reflects a country's scientific and technological level and scientific research capabilities. Nowadays, with the increase in marine development, the number of offshore industrial facilities such as submarine oil pipelines, deep-sea drilling platforms, and offshore cross-sea bridges is increasing year by year.
Corrosion characteristics of marine environment:
Seawater contains a large amount of salts with good electrical conductivity, forming a natural and good electrolyte solution. Therefore, metal structures in its environment will suffer particularly serious corrosion. If classified according to the characteristics of the marine environment, the marine corrosion environment can be divided into several areas: atmospheric area, splash area, tidal range area, full immersion zone and sea mud area.
Comparison of corrosion characteristics in different marine environment regions
| Marine area | Environmental Conditions | Corrosion characteristics |
| Atmospheric zone | Influencing factors include salt spray, rainfall, temperature, sunlight radiation, etc. | Corrosion and aging occur, and mold corrosion exists in some environments. |
| Splash zone | The surface of the material is impacted by sea water, moist and fully oxygenated. | Affected by sea water splashing and alternating wet and dry effects, severe corrosion. |
| Tidal zone | Materials are immersed periodically with sufficient oxygen supply. | Corrosion and biofouling occur, the corrosion rate is relatively low. |
| Full immersion zone | Influencing factors include salt content, pressure, dissolved oxygen, water temperature, marine life, bacteria, etc. | Corrosion and biofouling occur, and the corrosion rate changes with factors such as temperature and seawater depth. |
| Sea mud area | There are a large number of anaerobic microorganisms (such as sulfate reducing bacteria, etc.) | Typical anaerobic microbial corrosion occurs. |
Laser Cladding Machine
Laser cladding technology has been widely used in marine anti-corrosion, providing a strong guarantee for the safety and sustainable development of marine projects.
Laser cladding technology is an advanced surface repair, modification and coating technology. Its main principle is to locally melt the metal substrate through high-energy laser beam and spray metal powder, so that the substrate and metal powder are fused together to form New surface layer. This new surface layer has the characteristics of high hardness, high density, and high corrosion resistance, which can effectively extend the service life of marine projects.
S355 is a structural steel commonly used in marine environments. Marine structures made of S355 will suffer severe corrosion in marine environments. An Al-Ni-TiC-CeO2 composite cladding layer is prepared on the surface of S355 steel. The Al-Ni-TiC-CeO2 composite cladding layer can not only effectively improve the corrosion resistance of the base material, but also improve the wear resistance of the base material. and hardness, which can effectively improve the service life of the substrate. According to the corrosion environment of metal components, the corresponding alloy powder is configured to improve the corrosion resistance. For example, in the ocean atmosphere area, materials with average corrosion resistance such as stainless steel can be used. In the splash area or tidal range area, wear-resistant components can be added to nickel-based powder to improve the adaptability of the material in this area.
In Conclusion
Laser cladding technology is an advanced surface repair, modification and coating technology. Its main principle is to locally melt the metal substrate through high-energy laser beam and spray metal powder, so that the substrate and metal powder are fused together to form New surface layer. This new surface layer has the characteristics of high hardness, high density, and high corrosion resistance, which can effectively extend the service life of marine projects.
