Aluminum chromium-free passivation solution Yuanmoto®L632 is a chromium-free chemical conversion coating process suitable for aluminum materials, including pure aluminum, aluminum alloys and aluminum die-casting parts; it is composed of silicon-titanium-based main salt and film-forming aids , organic acids, etc., without phosphorus, chromium, lead, cadmium and other heavy metals and other harmful organic substances, safe and environmentally friendly; after treatment, a uniform, dense and nearly transparent film can be formed on the surface of the aluminum material. Excellent anti-corrosion performance, the almost transparent film layer can maintain the glossiness of the aluminum surface for a long time, and avoid the formation of spot rust caused by mold on the surface of the aluminum during long-term storage. Or painted to provide good adhesion. This product is used at room temperature, with low tank concentration, stable performance, high production efficiency and low overall cost.

• Safety and environmental protection, no phosphorus, heavy metal chromium

• Good corrosion resistance and good adhesion to subsequent coatings

• Maintain the glossiness of the aluminum surface for a long time

• Less addition, high efficiency, low overall cost

Recommended process flow:

Aluminum: degreasing→water washing→alkali or acid etching→water washing→water washing→passivation→water washing→drying (80-100℃) for subsequent coating

Precautions:

1. Prepare the bath solution according to the operation ratio. It is recommended to use pure water for the ratio. After fully stirring the bath solution, check the pH value with a pH meter to ensure that it is within the specified range;

2. The surface of the workpiece must be thoroughly degreased and deoxidized to ensure that there is no water film residue on the surface;

3. After using the medicinal solution for a period of time, adjust the solution to the required concentration and pH value according to the analysis method and PH measurement, and the usual amount of addition depends on the workload;

4. When the loading of aluminum materials is relatively dense and the processing capacity is large, it is recommended to mix with air when the bath is working to ensure the uniformity of the passivation film;

5. Die-casting aluminum parts are easily corroded, blackened and ash-coated during degreasing and degreasing. It is recommended to choose a suitable degreasing and degreasing potion, which will not cause over-corrosion of die-casting aluminum, which will seriously affect the subsequent passivation effect;

6. Die-casting aluminum parts are easily corroded, blackened and ash-coated during degreasing and degreasing. It is recommended to choose a suitable degreasing and degreasing potion, which will not cause over-corrosion of die-casting aluminum, which will seriously affect the subsequent passivation effect;

7. After the passivation treatment, wash with water and dry before drying, do not overlap the workpieces. After the workpieces are completely dry, they can be overlapped and placed for storage.