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Pretreatment of aluminum and its alloys is particularly important for plating quality. It is generally required to first perform crude degreasing with organic solvents (such as kerosene, gasoline, trichloroethylene, carbon tetrachloride, etc.), and then transfer to chemical degreasing. Fire alkali content can not exceed 5g / L, the total amount of inorganic salt should not exceed l00g / L, pH value between 8 ~ l0 is appropriate, the use of temperature is generally not more than 80 °C, it is better to use the replacement degreaser at room temperature is better . After polishing the polishing paste, the aluminum and its alloy parts are preferably first immersed for 2-5 minutes in a weakly alkaline wax-removing water to remove the wax (preferably using an ultrasonic wave to remove the wax), and then transferred to a chemical degreasing agent to remove oil.
Aluminum and its alloy parts should not use electrolytic degreasing. If electrolytic degreasing, we must control the content of inorganic salt can not be greater than 50g / L, the temperature is less than 70 °C, the time is less than 1min is appropriate. Otherwise, it will be over-etched, and the cathode must be electrolytically degreasing.
Degreasing of aluminum alloys has also been reported in the degreasing of phosphoric and sulfuric acid media (adding surfactants).
How to degrease aluminum and its alloy parts?
Aluminum is a very active metal, it is amphoteric metal. Degreasing of aluminum alloys is mostly carried out in alkaline degreasers, and the alkali content is strictly controlled.