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Precautions for surface treatment of sheet metal workpieces-sheet metal fabrication

- Dec 14, 2018 -

Precautions for surface treatment of sheet metal workpieces-sheet metal fabrication

First: It is necessary to pay attention to the state of the workpiece. All electrochemical treatment must be carried out under the loose parts of the workpiece, and the assembly does not feel electrochemically processed. Because the solution can be trapped in the gaps of the assembly during processing, causing corrosion to the workpiece.


Second: pay attention to the processing sequence problem, for example, the spot-welded parts can be chemically treated, but the electrochemical treatment must not be performed. Electrochemical treatment including electroplating and anodizing will affect the spot welding quality. For some electroplated or oxidized parts with riveting requirements, the processing must be followed by electroplating or oxidation before riveting.


Third: Pay attention to the pre-treatment before surface treatment. For example, before the steel is sprayed, it is necessary to phosphatize first, which can increase the adhesion of the coating. For bright nickel-plated steel, in order to improve its corrosion resistance, a layer of copper or dark nickel can be used first. Zinc-based alloys also have this problem. Before plating, it is also necessary to pre-coat a layer of copper or dark nickel to improve the bonding strength of the plating layer.


Fourth: It should be noted that the workpiece material and the processing method cannot conflict, and the aluminum alloy casting is never allowed to be subjected to sulfuric acid anodizing.

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