The passivation treatment process for aluminum and aluminum alloys is as follows:
Firstly, degreasing and cleaning: The main purpose is to remove impurities such as oil stains and dirt attached to the surface of aluminum alloy. Using aluminum cleaning agent, environmentally friendly formula, non corrosive to aluminum parts, cleaning the surface of aluminum parts without discoloration, can be soaked, sprayed, or ultrasonic cleaned. The oil and dirt removal speed is fast, and generally only needs to be soaked for 1-3 minutes to thoroughly clean.
Secondly, chemical solution removal of the oxide layer: Aluminum is prone to oxidation, and surface oxidation spots can affect the overall appearance and the adhesion of the paint, making it particularly prone to forming pitting. The process of removing the oxide layer by aluminum chemical polishing is an essential process before passivation. The use of chemical aluminum polishing agents can quickly improve the glossiness of aluminum, achieve a mirror effect, and remove burrs. Easy to operate, just soak at room temperature.
Thirdly, aluminum passivation: Immerse in aluminum passivation solution for 1-5 minutes. The purpose of passivation treatment is to form a dense and uniform continuous film on the surface of aluminum alloy, namely passivation protective film, effectively improving the oxidation resistance and corrosion resistance of the aluminum plate surface.
Fourth, soaking in pure water: 3 minutes. This process is a necessary one. Because chloride ions in tap water usually adhere to the surface of aluminum parts, it is necessary to soak them in pure water to prevent chloride ion residues and corrosion of aluminum veneer substrates.
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