oxide film
#1
At that time, I proposed to replace the alkali etching solution, because the alkaline etching solution will accumulate too much aluminum ions after using it for a long time, and the aluminum ions would plastic flower boxes suppliers ireland be hard to elute on the surface of the workpiece, thus affecting the contact between the aluminum surface and the conductive oxidizing solution. Oxide film formation. Another suggestion is that if unconditional replacement of alkali etching solution can be alkaline etching of the workpiece after rinsing with hot water rinse in flowing water, and then in concentrated nitric acid containing hydrofluoric acid light, and then rinsed fully conductive Oxidation treatment.
After the phone call from the reader said that after alkaline etching hot water washing effect is very good. The experience is that hot water in hot water quickly left the hot water and immediately immersed in water to prevent the workpiece after drying due to oxidation and wood plastic composite supplier malaysia affect the formation of conductive oxide film. Aluminum alloy and aluminum oxide film adhesion of the four reasons may be: oxide film is too thick (oxidation time is too long); (2) oxidation solution concentration is too large;
oxidation solution temperature is too high; Oxide film without aging. The operator can adjust according to the four factors that affect the adhesion of the oxide film. Oxidation of the perforation and its more difficult to form oxide film mainly for the following two reasons.
aluminum alloy and aluminum parts after rinsing alkaline washing is not complete. Caustic soda into the pores of the lye if not rinse clean, lye oxidation will be prompted to flow out of the cylinder, resulting in low cost wooden exterior building muterial corrosion of the oxide film around the hole. (2) aluminum alloy and aluminum workpiece hole around the lively. Aluminum tapping when the screw is very astringent, the operator often painted to live to lubricate the slippery, caustic wash if the lack of emulsifier in the lye, live is hard to remove. Solution: (1) wash with gasoline before caustic washing again, alkali lotion should be added with emulsifier; (2) the workpiece should be washed after caustic washing. Oxide film conductive state reasons: oxidation time is too long, the oxide film black fencing material akershus is too thick.
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