Choose a liquid degreaser that is weakly alkaline and won't corrode aluminum. The degreaser should preferably contain no inorganic substances, especially no sodium nitrite, sodium silicate, metasilicate, caustic soda, sodium fluoride, sodium chloride, chromium-containing oxidizers, or other inorganic compounds.
You can use cleaners for non-ferrous metals or neutral degreasers.
How to choose an anti-corrosion treatment after degreasing
Since aluminum is a soft material, a single degreasing step usually can't remove oil that has soaked into the aluminum. So for aluminum, anti-corrosion treatment should use a passivating agent or oxidizer that also has degreasing properties, so that a colorless passivation film forms while completely removing any oil.
Such as aluminum degreasing passivators, chromium-free degreasing and oxidation solutions, etc.
What standards are needed for aluminum corrosion-resistant passivation treatments?
① Has grease removal function.
② It's an eco-friendly product and absolutely must not contain chromium ions (including trivalent chromium) or other heavy metals and strong oxidizers, like nickel, copper, lead, nitric acid, etc.
③ Can't use organic corrosion inhibitors that affect adhesion, like silicates, sodium benzoate, sodium nitrite, emulsified wax, emulsified oils, etc.
④ After passivation, the coating should be a colorless, transparent film, and there should be no white or black rust on the aluminum surface within the required time.
⑤ Should not use acidic substances that react strongly with aluminum, like fluorides.
