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S355 steel surface coating technology

S355 steel is a new type of structural steel with high strength, high plasticity and high impact toughness. It is mainly used in the manufacture of offshore platform legs. S355 steel is used as steel for marine environment, and S355 structural steel has been used in humid salt spray environment for a long time. , It is vulnerable to seawater erosion and produces strong electrochemical corrosion, which reduces the mechanical properties of the material and shortens its service life. Moreover, the offshore platform is far away from the coast, so it is difficult to maintain and maintain it regularly, especially in the splashing area of ​​the waves, its corrosion rate About 6 times that of the general case.

Therefore, the surface anti-corrosion treatment of S355 structural steel is a topic with long-term significance. Recently, the research on S355 steel mainly focuses on the research on the microstructure and mechanical properties of its welded joints, and there are few reports on its anti-corrosion technology.

Coating Al coating on the surface of S355 steel is a common anti-corrosion treatment method for materials. In marine environment, Al coating shows more excellent anti-corrosion performance than Zn coating, with good bonding strength, high hardness and low brittleness. It can effectively prevent the occurrence of cracking, blistering, rusting and peeling of S355 steel."