**1. Introduction**
The working environment of satellite receiving antennas is quite challenging, requiring high corrosion resistance from the coating. Our company has adopted anodic electrophoretic coating for these antennas, significantly improving their corrosion resistance. The salt spray test results show that the coating can withstand over 500 hours, which extends the service life of the product. Additionally, the production efficiency has increased, reducing the cost by 4 yuan per square meter compared to traditional powder coating, thus enhancing overall economic benefits.
**2. Anode Electrophoretic Coating Process**
The anodic electrophoretic coating process for satellite receiving antennas involves several key steps: pre-cleaning, pre-treatment, electrophoretic coating, post-cleaning, and baking. The detailed procedure includes manual removal of release agents, followed by hot water washing, degreasing, multiple rinses with tap water and deionized water, and finally electrophoretic coating. The coating is applied by immersion for 180 seconds at a temperature between 25°C and 30°C, with a voltage range of 0–300V. Afterward, the parts are rinsed with ultrafiltration (UF) liquid and pure water before being baked at 170–180°C for 30 minutes.
The filtration system uses a 4-mesh bag structure with 6 sets and 24 inner bags, each with a pore size of 50 μm, ensuring efficient filtration without clogging. The circulation system includes bath circulation, heat exchange, and ultrafiltration cycles, operating at 5–7 cycles per hour to maintain bath stability. The ultrafiltration system requires continuous operation, with inlet pressure between 0.35–0.40 MPa and outlet pressure between 0.15–0.20 MPa. A dedicated cleaning system is also in place to maintain membrane performance. The power supply operates in a two-stage mode, ensuring controlled and uniform coating.
**3. Control of Process Parameters in Anodic Electrophoresis**
3.1 **Voltage**
The electrophoretic system uses a two-stage power-on method. Due to the large surface area of the antenna, the voltage is initially set between 60–100V, then increased to 150–250V once the paint film resistance rises. This ensures even coating thickness without affecting the signal reception or corrosion resistance.
3.2 **Bath Conductivity**
Conductivity directly affects the quality of the coating. Too high or too low conductivity can lead to rough films or poor adhesion. To maintain optimal levels, pure water replacement is used during operation.
3.3 **Bath Temperature**
Temperature control is crucial. Too high a temperature causes rough coatings, while too low leads to thin films and poor bubble release. The system uses a combination of cooling and electric control to maintain stable temperatures.
3.4 **Electrophoresis Time**
The time spent in the bath directly impacts coating thickness and coverage. Adjusting line speed is necessary if production efficiency changes, as this affects the final film quality.
3.5 **pH Value**
Anodic electrophoretic coatings require a balanced pH to prevent insoluble particles and maintain film integrity. Proper alkalinity ensures smooth electrodeposition and prevents film thinning.
3.6 **Solid Content**
The solid content in the bath refers to resins, pigments, and additives. Too much or too little can result in uneven coatings, affecting both appearance and performance.
3.7 **Pigment Base Ratio**
This ratio influences the color and corrosion resistance of the coating. Maintaining the correct balance is essential for consistent quality.
3.8 **Solvent Content**
The amount of hydrophilic solvents in the bath affects the solubility of the paint, which in turn influences the final film quality.
3.9 **Baking Temperature and Time**
Proper baking is critical for full curing of the coating. Insufficient time or temperature can lead to soft, weak films, reducing durability and performance.
**4. Conclusion**
In summary, the scientific management and regular testing of anodic electrophoretic coating parameters are essential for maximizing the use of existing equipment and producing high-quality satellite receiving antennas. By continuously adjusting based on test results, we ensure consistent performance, reliability, and long-term value.
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