First, the intrinsic factors of galvanized square tube sheet are that the nickel content in galvanized square tube is low and the passivation performance of galvanized square tube is low. Therefore, the martensite content and the chromium and nickel content in galvanized square tube sheet have great influence on the passivation performance of galvanized square tube sheet.
2. The passivation film of galvanized square tube belongs to the restrained metastable structure in thermodynamics. The maintenance of the passivation film is related to the medium in the environment. However, no matter what kind of environment is used, in the process of operation, the galvanized square tubesheet should be cleaned periodically to remove the harmful substances attached to the surface of the galvanized square tubesheet.
3. Exterior cleanliness of galvanized square tube sheets. As for galvanized square tube alloy, the lower the lubrication roughness of galvanized square tube is, the harder the foreign body attaches to the surface of galvanized square tube, and the foreign body is not easy to attach, so the corrosion to the surface of galvanized square tube will be reduced to the lowest point, so the galvanized square tube should adopt the finishing appearance as far as possible. In addition, the final passivation cleaning of galvanized square tube sheet should also be seriously stopped, so that the remaining acid can promote the anode response, maintain the integrity of the film, and ensure that the corrosion resistance of the galvanized square tube sheet is strengthened.
4. Chloride ion and chloride ion are very harmful to galvanized square tube sheet. Therefore, we should strictly control the content of chloride ion in the passivation solution during the process of stopping passivation of galvanized square tube sheet, based on the harmfulness of chloride ion to galvanized square tube sheet. Many passivation chemical materials have limited requirements for chloride ions. Water for passivation solution and cleaning water also have strict water quality requirements for chloride ions to ensure that passivation waste does not contain chloride ions.
Galvanized square tubes are corroded rapidly in the presence of chloride ions, so that they exceed ordinary low carbon steel. As for steel pipes under fluid pressure, hydraulic tests should be prevented to repair their ability and quality of withstanding pressure. Under the specified pressure, no disclosure, wetting or shrinkage should occur, and some steel pipes should also be prevented from edge-rolling, flattening and flattening experiments on the basis of scale or requirement.
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