Technical Sharing | Aluminum Alloy Chromium-Free Passivation Solution Yuanmoto®L632 Formula
Release time:
2023-03-16 10:07
Source:
Yuanmoto® L632 aluminum chromium-free passivation solution is a chromium-free chemical conversion film process suitable for aluminum materials, including pure aluminum, aluminum alloys, and aluminum die-castings; it consists of silicon-titanium-based closed main salts, film-forming aids, organic acids, etc., and does not contain phosphorus, chromium, lead, cadmium, or other heavy metals and harmful organic substances, making it safe and environmentally friendly; after treatment, it can form a uniform, dense, nearly transparent film layer on the surface of aluminum materials, which has good corrosion resistance. The nearly transparent film layer can maintain the gloss of the aluminum surface for a long time, preventing the aluminum from developing mold spots and rust during long-term storage. It can also be used for pre-treatment before coating aluminum materials, providing good adhesion for subsequent spraying or painting. This product is used at room temperature, has a low concentration in the tank, stable performance, high production efficiency, and low overall cost.
• Safe and environmentally friendly, free of phosphorus and heavy metal chromium
• Good corrosion resistance, providing good adhesion for subsequent coatings
• Maintains the gloss of the aluminum surface for a long time
• Low dosage, efficient, low overall cost
Recommended process flow:
Aluminum materials: degreasing → rinsing → alkaline etching or acid etching → rinsing → rinsing → passivation → rinsing → drying (80-100℃) for subsequent coating
Precautions:
1. Prepare the tank solution according to the operating ratio, it is recommended to use purified water for the ratio. After fully stirring the tank solution, use a pH meter to check the pH value to ensure it is within the specified range;
2. The surface of the workpiece must be thoroughly degreased and deoxidized to ensure there are no water film residues on the surface;
3. After the solution has been used for a period, adjust the solution to the required concentration and pH value according to the analysis method and pH measurement. The usual dosage depends on the workload;
4. When aluminum materials are loaded densely and the processing volume is large, it is recommended to use air stirring during operation to ensure the uniformity of the passivation film;
5. Die-cast aluminum parts are prone to severe corrosion, blackening, and gray hanging during degreasing. It is recommended to choose suitable degreasing agents to avoid excessive corrosion of die-cast aluminum, which can severely affect the subsequent passivation effect;
6. Die-cast aluminum parts are prone to severe corrosion, blackening, and gray hanging during degreasing. It is recommended to choose suitable degreasing agents to avoid excessive corrosion of die-cast aluminum, which can severely affect the subsequent passivation effect;
7. After passivation treatment, do not stack the workpieces together before rinsing with water and drying. Once the workpieces are completely dry, they can be stacked together for storage.
Technology, aluminum materials, rarr, passivation, surface, treatment, subsequent, degreasing, corrosion, bull
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