What is arc spraying long-term anti-corrosion technology? What are the outstanding features?

       Arc sprayed long-term anti-corrosion composite coating refers to the composite coating of arc sprayed metal coating and closed coating. Arc sprayed metal coating mainly includes arc sprayed zinc, aluminum and its alloy coating, and closed coating includes closed bottom layer, Close the middle layer and close the surface layer. The anti-corrosion principle of arc sprayed long-term anti-corrosion composite coating to steel substrate is the combined effect of physical shielding and cathodic protection. The main function of the sealing coating is to physically isolate the erosion of various corrosive media on the metal sprayed layer and the steel substrate, and the arc sprayed metal coating provides the cathodic protection of the steel substrate at the expense of self-protection of the steel. Tests conducted by the Netherlands Institute for Hot Dip Coating show that the composite coating formed by the sealing treatment after spraying zinc or aluminum. Its corrosion resistance is 50%~130% higher than the sum of the corrosion resistance life values of the zinc spray or aluminum coating and the sealing coating alone. This effect is known as optimal synergy and is internationally recognized. From this, the calculation formula for the life of the arc sprayed long-term anti-corrosion composite coating can be obtained: composite coating anti-corrosion life = (spraying aluminum coating life + sealing coating life) X (1.5~2.3).



Salient features



    1) Long anti-corrosion life; according to different corrosive environments and specific workpiece characteristics, through reasonable coating design, the anti-corrosion life of the arc spraying long-term anti-corrosion composite coating system itself can reach more than 15 years. If properly maintained, arc sprayed long-lasting anti-corrosion composite coatings can extend the service life of steel structures to more than 20 years.

    2) High bonding force with the steel substrate: The arc sprayed coating and the steel substrate work together by mechanical hot inlay and micro-metallurgical bonding, and the coating shows a high bonding force.

    3) The arc spraying long-term anti-corrosion technology adopts double wire feeding, and the single-machine production efficiency is high.

    4) Good coating quality: The arc spraying heating wire method is arc heating, the wire melting temperature is high, the atomization is sufficient, the sprayed layer is uniform and dense, the coating quality is stable, and it has no effect on the thermal stress of the workpiece.

    5) Strong repairability. During the process of processing, lifting, transportation, installation and welding of steel structural parts, the coating will inevitably be damaged. The arc spraying technology can be repaired on site to ensure the integrity and effectiveness of the anti-corrosion coating system.

    6) Good adaptability; arc spraying technology can select corresponding corrosion-resistant materials according to different corrosive environments, and the process system has universal adaptability.

    7) The operation is flexible and not limited by the size of the workpiece; large-scale components such as bridges, iron towers, steel piles, and oil platforms can be constructed in the factory or on-site.

    8) Both manual spraying and mechanized construction can be achieved; according to the size of the construction area and the shape of the workpiece, manual spraying or mechanized construction can be selected.

    9) The requirements for environmental conditions are low; whether in the cold northern region in winter or the hot southern region in summer, the construction of arc spraying long-term anti-corrosion coating can be carried out at any time, and the arc spraying layer has no curing time requirements.