Packaging passivation processing operations of the strip profile

Packing passivation operation profile of the strip steel strip surface usually through chemical or electrochemical passivation treatment: passivation of the main play the purpose is to make the packaging steel strip surface stabilization, prevent the growth of the surface tin oxide, too much tin oxide will make packaging steel strip is stored in the color, especially in the process of baking paint or printing color. Packaging steel strip production line, steel strip after the soft melting oil before passivation treatment. Method is to make the strip steel by a chemical solution, in electricity or without electricity. The most common use of passivation treatment is to use sodium dichromate solution, strip steel as the cathode electrolytic electricity flow processing. Another Tun processing method is a simple dip, not current, make the strip steel impregnated in similar solution or chromic acid solution. When the tinplate is used for packaging dairy products, some factory also USES a cathode processing in sodium carbonate solution, sometimes there are some other processing method will be used. Unless otherwise agreed with the buyer, factories usually use are the first of several kinds of treatment methods, and the sodium dichromate cathodic passivation treatment. Some factories - set of digital code system are used to indicate Tun processing type. Packaging steel strip in the process of production without passivation treatment.