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Dai Nippon Toryo Co. Ltd. (TYO:4611) and Sekisui Chemical Co. Ltd. (TYO:4204) have jointly developed a sheet product that includes zinc dust to offer sacrificial protection from corrosion.
By going with the concept of pasting rather than painting, the new sheet allows users to more easily apply an even coat. In addition, a barrier film on the surface serves to keep out corrosive agents such as moisture and salt, which means the sheet can be used in conjunction with various other coatings.
The combined thickness of the adhesive layer and the barrier layer comes to approximately 0.65 millimeters. The sheet itself is elastic so that cracks are covered up automatically, with the protective functionality then being ensured by both the self-repairing adhesive layer and the sacrificial protection provided by the zinc dust. If cracks or aging are too much for this self-repair feature, the zinc liquates to form a coat over the spot, offering protection for steel surfaces. This is being called the industry’s first method of its kind to produce such a sheet with sacrificial protection.
The new sheet retains its adhesiveness in a wide range of environments – whether wet, hot or cold – and has been found to have thermal resistance at temperatures of up to 150 degrees Celsius. The barrier layer exhibits a high level of weather resistance, while the adhesive layer offers protection from UV light.
Going forward, Japan is to face a surge in maintenance demand for buildings constructed decades ago as part of the country’s postwar economic boom. With steel structures aging amid a labor shortage in the construction and maintenance sectors, Dai Nippon Toryo and Sekisui Chemical will market their new sheet as a product that offers anti-corrosive performance on par with paints while also being easier to apply.