BY-48 aluminum natural color chromizing agent
1 Introduction
There are many types of chemical conversion coatings of aluminum and its alloys, of which are typically chromate, phosphorous-chromate, tannic acid, and phosphate membranes. Among them, the phosphorus-chromate film has better corrosion resistance and can be separately preserved. In view of the market demand for aluminum products, the film is thin and uniform, with strong adhesion, good corrosion resistance and low cost. This product has been specially developed.
2. Main features
2.1 This agent is a low chromate product with a Cr6+ content of less than 1g/L.
2.2 The conversion film has no obvious influence on the binding force of the coating film when it is heated within 200 °C.
2.3 The film color is from true to light gray.
2.4 Used in combination with alumina acid to simplify the process and save investment and improve efficiency.
3. Scope of application
Suitable for impregnation and spray treatment of aluminum parts.
4. Typical process
Aluminic acid desorption → water washing → water washing → film forming agent → water washing → water washing → drying
5. Technical indicators
Serial number | Project | Indicator |
1 | Exterior | Light yellow liquid |
2 | proportion | 1.10±0.02 |
3 | Match ratio | 10% |
4 | Working temperature °C | Normal temperature ~ 40 |
5 | Processing time min | Impregnation: 5-10 Spray 2-5 |
6 | Free acidity | 10-15 |
6. Preparation and adjustment
6.1 When preparing the working fluid, add it in a ratio of 100-120kg per ton plus BY-48 type, and shake it evenly for use.
6.2 Addition can be added according to the free acid of the working fluid. To increase the free acid point per ton of working fluid, it is necessary to add 7Kg of BY-48 type film former.
6.3 When the solution is used for a long time, consider replacing the working fluid.
7. Precautions
7.1 After the workpiece is processed, it should be dried and aged before spraying.
7.2 After working for a period of time, its efficiency will decrease, and the BY-48 type film former should be properly supplemented.
7.3 The F-/CrO3 in the working fluid should be controlled in the range of 0.18-0.37. When the workpiece is processed to a membrane weight of 0.2-1.2g/m2, the ratio should be analyzed.
8. Packaging, storage and transportation
Packed in 25kg plastic drum, stored in a cool dry place, the barrel mouth is up when transported to prevent leakage.
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