Regarding the selection criteria of the pre-treatment chemicals for aluminum plates The pre-treatment of aluminum plates usually includes the removal of surface grease and anti-corrosion treatment. However, the selection of aluminum plate treatment agent still requires certain standards, so as to solve the problem that the grease on the surface of the aluminum plate cannot be removed, which seriously affects the effect of subsequent anti-corrosion treatment.
What are the criteria for the selection of degreaser for aluminum plates? Use liquid degreasing agent, which is weakly alkaline and can not corrode aluminum plates. The degreasing agent should not contain inorganic substances as much as possible, especially sodium nitrite, sodium silicate, sodium metasilicate, caustic soda, sodium fluoride , Sodium chloride, chromium-containing oxidants and other inorganic substances. Such as non-ferrous metal cleaning agent, neutral degreasing agent, etc.
How to choose the anti-corrosion treatment agent after degreasing? Because the aluminum plate is a soft material, it is not easy to remove the oil stains immersed in the aluminum plate with one degreasing. While forming a colorless passivation film, the grease is completely removed. Such as aluminum plate degreasing passivator, chromium-free degreasing oxidizing liquid, etc.
What are the standards for the anti-corrosion passivation treatment agent for aluminum plate processing? It has the function of degreasing. For environmentally friendly products, it must not contain chromium ions (including trivalent chromium) nor other heavy metals and strong oxidants such as nickel, copper, lead, nitric acid, etc. Organic corrosion inhibitors that affect the binding force cannot be used for corrosion prevention, such as silicate, sodium benzoate, sodium nitrite, emulsified wax, and emulsified oil. The film layer after passivation is a colorless transparent film, and there should be no white rust or black rust spots on the aluminum surface within the required time. Acidic substances that react violently with the aluminum plate, such as fluoride, cannot be used.
As long as the above conditions are met, any chemical solution can be used. It is better to choose environmentally friendly, low-cost, room-temperature-treated chemical solutions. You can select eligible products for testing and screening through online search. Standard, how much do you know?