[China Aluminum Industry Network] Scratch generation process: electrophoretic painting causes: Electrophoretic painting definition: In the just after the electrophoretic painting material, attached to the acid produced by the flow pattern with a trace of gel.
Phenomenon: Residual acid in the fixture's gap, etc., flows to the surface of the material just after electrophoretic painting, and the surface of the paint film becomes a gelled flow mark pattern.
Cause: An acid adhered to the jig or the like in the anodizing process but was not removed during washing.
Countermeasures: (1) fully wash the fixture; (2) change the fixture structure.
The pitting process: Electrophoretic painting causes: The electrophoretic painting definition: Dust and other substances adhere to the material, and fine irregularities are generated on the surface of the paint film.
Phenomenon: Fine unevenness on the surface of the paint film.
Cause: Dust and the like adhered to the material in the electrophoretic painting process and the baking process.
Countermeasure: Check the cause of dust and other things and remove it.
Pit generation process: Electrophoretic paint cause process: Electrophoretic paint definition: Impurities in the paint adhere to the surface of the paint film, or mixed into the paint film, turning into tiny pits after baking. Phenomenon: Dimples with a diameter of 1~2mm are formed on the surface of the paint film, but have nothing to do with the location of the material. Some pits even reach the surface of the anodized film, and sometimes the pits with small apertures are called pinholes. Reasons: (1) impurities (oil, grease, etc.) mixed in the electrophoretic paint adhere to the surface of the paint film; (2) the low PH value of the paint and excess solvent make the film polarizability lower. This red defect is easy to produce. Countermeasures: (1) remove the impurities in the paint; (2) increase the PH value of the paint, while suppressing the thickness of the paint film in the necessary smaller range.
Yellowing process: electrophoretic paint causes: Electrophoretic paint definition: Inappropriate defects occur after baking and the paint film is yellow.
Phenomenon: The paint film has yellow color.
Reasons: (1) When the film thickness occurs; (2) When the baking temperature is high, or when the baking time is long.
Countermeasures: (1) improve the painting conditions, or baking time is long; (2) improve the painting conditions, select the appropriate baking temperature, time.
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