Select a liquid degreaser that is weakly alkaline and does not corrode aluminum. The degreaser should preferably be free of inorganic substances, especially those containing sodium nitrite, sodium silicate, metasilicate, caustic soda, sodium fluoride, sodium chloride, chromium-containing oxidizers, and other inorganic materials.
Such as non-ferrous metal cleaners, neutral degreasers, etc.
How to choose a corrosion inhibitor after degreasing
Since aluminum is a soft material, a single degreasing step cannot easily remove oil that has penetrated into the aluminum. Therefore, corrosion protection treatment for aluminum should use passivating or oxidizing agents with degreasing capabilities, which can completely remove the oil while forming a colorless passivation film.
Such as aluminum degreasing passivators and chromium-free degreasing oxidizing solutions.
What standards are required for aluminum corrosion-resistant passivation treatments?
① Has the function of removing oil and grease.
② It is an environmentally friendly product and must not contain chromium ions (including trivalent chromium), nor any other heavy metals or strong oxidizers, such as nickel, copper, lead, nitric acid, etc.
③ Corrosion inhibitors that affect adhesion, such as silicates, sodium benzoate, sodium nitrite, emulsified wax, and emulsified oils, must not be used for corrosion protection.
④ After passivation, the coating should be a colorless and transparent film, and within the required time, there should be no white rust or black rust spots on the surface of the aluminum.
⑤ Acidic substances that react violently with aluminum, such as fluorides, must not be used.
As long as the above conditions are met, any company's solution can be used. The best choice is an environmentally friendly, low-cost solution that can be handled at room temperature. You can search online to select products that meet the criteria for testing and screening.
