The metal surface pretreatment is inevitably oxidized during various heat treatment, machining, transportation and storage processes to produce a thick and uneven oxide layer. At the same time, it is also susceptible to various oil pollution and adsorption of some other impurities.
For oil stains and certain adsorbents, the thinner oxide layer can be washed with solvent, chemically and mechanically, or directly with chemical treatment. For heavily oxidized metal surfaces, the oxide layer is thicker and cannot be directly cleaned with solvents and chemically treated, but is preferably mechanically treated first.
The treated metal surface is generally highly reactive and is more susceptible to contamination by dust, moisture, and the like. For this purpose, the treated metal surface should be glued as quickly as possible.
The metal storage period after different treatments is as follows:
(1) wet blasting aluminum alloy, 72h;
(2) chromic acid-sulfuric acid treated aluminum alloy, 6h;
(3) anodized aluminum alloy, 30 days;
(4) sulfuric acid treated stainless steel, 20 days;
(5) blasted steel, 4h;
(6) Brass treated by wet blasting, 8h.
For oil stains and certain adsorbents, the thinner oxide layer can be washed with solvent, chemically and mechanically, or directly with chemical treatment. For heavily oxidized metal surfaces, the oxide layer is thicker and cannot be directly cleaned with solvents and chemically treated, but is preferably mechanically treated first.
The treated metal surface is generally highly reactive and is more susceptible to contamination by dust, moisture, and the like. For this purpose, the treated metal surface should be glued as quickly as possible.
The metal storage period after different treatments is as follows:
(1) wet blasting aluminum alloy, 72h;
(2) chromic acid-sulfuric acid treated aluminum alloy, 6h;
(3) anodized aluminum alloy, 30 days;
(4) sulfuric acid treated stainless steel, 20 days;
(5) blasted steel, 4h;
(6) Brass treated by wet blasting, 8h.
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