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Coating before printing. Under normal circumstances, the front and back sides of the tinplate need to be coated with the Coating on the outer surface and the Coating on the inner surface to ensure that the printed tinplate products have good canning, canning and appearance decoration requirements. Of course, the coating film thickness of this coating is usually only A few microns thick, it is difficult to completely cover the surface of the tinplate. Therefore, in order to prevent corrosion at the defects of the organic coating film, the tinplate is required to have corrosion resistance, and the oxide film on its surface provides coating film compactness and surface oil layer protection coating film leveling.