Choose a liquid degreaser that is weakly alkaline and does not corrode aluminum. The degreaser should preferably be free of inorganic substances, especially it must not contain inorganic materials such as sodium nitrite, sodium silicate, metasilicate, caustic soda, sodium fluoride, sodium chloride, or chromium-containing oxidizers.
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 is not sufficient to remove oil that has penetrated into the aluminum. Therefore, aluminum corrosion protection treatments 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, chromium-free degreasing and oxidizing solutions, etc.
What standards are required for aluminum corrosion-resistant passivation treatment agents?
① Has the function of removing grease and oil.
② It is an environmentally friendly product and absolutely must not contain chromium ions or other heavy metals and strong oxidizing agents such as nickel, copper, lead, nitric acid, etc.
③ Organic corrosion inhibitors that affect adhesion, such as silicates, sodium benzoate, sodium nitrite, emulsified wax, and emulsified oils, cannot be used for corrosion protection.
④ The passivated film layer is a colorless and transparent film, and within the required time, there should be no white rust or black rust spots on the aluminum surface.
⑤ Acidic substances that react violently with aluminum, such as fluorides, cannot be used.
