1, check: check whether the workpiece prior to pickling process with iron hole factory galvanized (zinc and exhaust, night, hanging), the corrosion degree of surface iron workpiece, the surface cover can be removed (such as hydrochloric acid paint, grease should be used in fire, grinding, cleaning method to remove).
2, skim (Jian Xi): equipped with heating equipment, remove surface grease, paint and other iron workpiece。
3, wash: remove salt and iron workpiece surface attachment.
4, pickling: remove rust, oxide skin and other surface coverings
5, after pickling check processing: pickling effect is ideal, such as pickling is not sufficient, once again, if the pickling before treatment is not thorough, need to re - processing after pickling.
6, washing: remove the surface of the iron acid water and other attachments
7, the plating agent: once again cleaning the workpiece surface, to ensure that the surface is not in the rust before galvanized.
8, drying: improve iron workpiece temperature, avoid excessive iron surface water, the explosion occurred in galvanizing。
9, hot dip galvanizing zinc liquid: workpiece immersed in 440 -470 DEG C molten, reached after a certain time, the surface of workpiece is obtained with a layer of zinc iron alloy layer and pure zinc coating layer.
10, passivation: to provide the workpiece surface resistance to atmospheric corrosion, reduce or prolong the time of white rust.
11, cooling: to prevent the cooling of the workpiece back to shrink, resulting in collective tissue cracking.
12, finishing: clear zinc tumor and attached to the surface coating of zinc ash
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