Daily maintenance of electrophoresis anode system
During the electrophoretic coating production process, the organic acid produced by the production process is removed from the electrophoresis tank through the anode system to ensure the best coating effect and the stability of the electrophoretic paint solution; this prevents organic acids from accumulating in the bath solution. The decrease in pH and the increase in conductivity affect the quality and appearance of the electrophoretic film.
Anode system daily maintenance precautions:
(1) If the anode tube leaks or breaks, turn off the anolyte circulation pump and turn off the rectifier immediately, and replace the leaked anode tube in time. The specific operation is as follows:
A. Close the anolyte circulation pump and turn off the rectifier.
B. Detect leaking anode tubes;
C. Leak the leaked anode tube away from the anode system (close the inlet ball valve);
D. Replace the leaking anode tube.
(2) When the electrophoresis tank is cleaned, the anode membrane must be moisturized:
When the main electrophoresis tank is empty, the anolyte circulation system must maintain the circulation state and continuously spray deionized water on the anode membrane. Otherwise, electrophoretic paint will dry on the anodic film and the anodic film will dry out. The dried electrophoretic paint will increase the resistance. Once the anodic film is dried, it will permanently lose the penetration function of the semipermeable membrane and the anode tube will be scrapped.
(3) Ammonia discharge
The conductivity of the anolyte reflects the acid concentration. In the electrophoretic coating process, the anolyte conductivity gradually increases with the increase of the acid concentration. Periodically discharge the anolyte inside the anode box and add deionized water to reduce the conductivity of the electrophoretic paint solution. The conductivity of the anolyte should be maintained within a certain range (for example, 500 to 1000 mS/cm). If the conductivity is high, certain anolyte must be discharged and fresh deionized water must be added.
(4) Color change of anolyte:
The normal anolyte is clean and transparent. In the first few weeks of the new trough, pay special attention to the color of the anolyte. Discoloration quickly indicates a problem with the anode system. If discolored, give special attention.
If the anolyte becomes obscure, the anodic film may be damaged or contaminated by bacteria. If the anodic film is damaged, it needs to be replaced immediately. If the anodic solution is contaminated by bacteria, the bactericidal agent (provided by the paint manufacturer) needs to be added immediately.
If the color of the anolyte becomes close to the bath, the anode film may be damaged.
If the anolyte color becomes dark (brown or black), but it is still transparent, it indicates that the stainless steel anode rod is eroded too quickly. The main reason is that the anolyte conductivity is too high, and the anolyte needs to be immediately discharged to add deionization. water.
(5) Material of anode rod If it is a 316 stainless steel tube, the anode rod will be gradually lost due to electrochemical reaction, and its consumption rate depends on the product passing through the electrophoresis tank and its productivity. In actual production, the anode rods should be dismantled and inspected every year, and if the loss is severe, they need to be replaced.
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