[China Aluminum Industry Network] Aluminum plate workpieces are not completely washed after caustic washing. Alkali which enters the pores during caustic washing fails to be washed cleanly. After the oxidation treatment, the caustic soda flows out of the cylinder, causing the oxide film around the pores to be corroded. There are liveliness around the hole in the aluminum plate workpiece. Aluminum tapping screw hole is very astringent, the operator often coating to live lubrication, alkali cleaning when the lack of emulsifier in the lye, it is difficult to dilute live. Caused by the excessive accumulation of aluminum ions in the alkali solution A reader calls to ask the reason why it is difficult to obtain the conductive oxide film after alkali etching. After eliminating many factors that are difficult to form the conductive oxide film, consider whether the alkali solution is There is a problem of high aluminum ion, the other party said that the alkali solution is very thick. However, the alkali corrosion rate is not fast. At that time, the aluminum plate was replaced with an alkaline etching solution because the alkali solution would accumulate too much aluminum ions after it was used for a long time, and the aluminum ions would be difficult to elute on the surface of the workpiece, thereby affecting the contact between the aluminum surface and the conductive oxide solution, thereby affecting the oxidation. Film formation.
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