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[China Aluminum Network] The pretreatment of aluminum materials usually involves removal of surface oils and anti-corrosion treatment. However, the selection of aluminum treatment agent still needs certain standards, so as to solve the problem that the oil on the surface of the aluminum material can not be eliminated, which will seriously affect the subsequent anti-corrosion treatment.
What is the standard for the selection of aluminum degreasing agent?
Liquid degreasing agent is used. It is weakly alkaline. It cannot corrode aluminum materials. The degreasing agent contains no inorganic substances as much as possible. In particular, it cannot contain sodium nitrite, sodium silicate, sodium metasilicate, pyrogenic alkali and fluorination. Sodium, sodium chloride, chromium-containing oxidants and other inorganic substances.
Such as non-ferrous metal cleaners, neutral degreasing agents.
How to choose the anti-corrosion agent after degreasing
Since aluminum is a soft material, removing oil is not easy to remove the oil immersed in the interior of the aluminum. Therefore, the aluminum anti-corrosion treatment should use a deactivating agent or oxidizing agent to form a colorless passivation film. , remove the oil thoroughly.
Such as aluminum degreasing agent, non-chromium degreasing oxidation fluid.
What are the standards for aluminum anti-corrosion passivation agent?
1 has degreasing function.
2 is an environmentally friendly product that cannot contain chromium ions (including trivalent chromium) and other heavy metals and strong oxidants such as nickel, copper, lead, and nitric acid.
3 Can not use organic inhibitors that affect the binding force for corrosion protection, such as silicate, sodium benzoate, sodium nitrite, emulsifying wax, emulsified oils and so on.
4 After the passivation, the film is a colorless transparent film, and white rust or black rust may not be present on the aluminum surface within the required time.
5 Acidic substances that react violently with aluminum, such as fluorides, cannot be used.
As long as the above conditions are satisfied, which one of the liquids can be used, it is better to use environmentally-friendly, low-cost, room-temperature-treated liquids. You can check and select products that meet the conditions for testing and screening.
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