Control method for painting shrinkage cavity defect of tin-plated plate
A control method and technology of tin-plated plate are applied in the field of coating and coating to achieve the effect that the control method is simple and easy to implement
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[0022] Tinplate production process: 1) With low-carbon cold-rolled steel plate as the substrate, the conventional process is used for alkali cleaning and annealing, and then the double-stand tempering machine and the dry-leveling process without leveling liquid are adopted, and the 1# frame leveling roll Roll surface roughness Ra is 1.5 μm, surface peak density RPc is 100 pieces / cm, surface roughness Ra of 2# frame leveling roll is 0.6 μm, surface peak density RPc is 200 pieces / cm, and then obtained by coil Substrate; 2) The tin-plated substrate is subjected to alkali cleaning, pickling, electroplating, fluxing, and reflowing by conventional processes, and then two passivation tanks are used for passivation. The passivation method is electrochemical passivation, and the passivation temperature is 42 ℃, the concentration of sodium dichromate in the passivation solution is 20g / L, the pH value of the passivation solution is 4.5, and the charge density of 1# passivation tank is 1.2...
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