Why does the electrophoretic film need to be re dissolved?

The insoluble wet electrophoretic paint film deposited on the coated object is neutralized by alkali (or acid) in the bath solution again and becomes water-soluble, which makes the formed paint film partially or completely dissolved, leading to thinning, loss of light, pinhole, exposure and other phenomena This defect is called electrophoretic paint film re dissolution What is the cause of it? How to solve it? The following common reasons: 1 The coating stays in the electrophoresis tank or UF washing solution for a long time after electrophoresis, resulting in the re dissolution of some products or batches of products This type generally appears in the step-by-step non-automatic electrophoresis production line 2 The pH value of the bath solution is seriously too low, resulting in the continuous mass production of electrophoretic coating film re dissolution The impact of this situation is the most serious, and even affects the normal production arrangement and shipment 3 The solvent content is too high, the flushing pressure of UF liquid is too high, and the flushing time is too long This kind of situation generally appears in the automatic electrophoresis line of continuous operation, and the abnormal paint film is often accompanied by the phenomenon of Hualian 4 The breakdown of the electrophoresis equipment resulted in the re dissolution of some products Solution: 1 In intermittent production, the coating should be taken out of the tank immediately after power failure; the residence time in the UF liquid water washing tank should not exceed 2 Measures shall be taken to ensure that the pH value of the electrophoresis bath is within the required range, and the diaphragm anode system shall be checked to ensure that there is no leakage of the anode solution, and the pH value control of the electrophoresis bath shall be strengthened 3 Reduce the addition of solvent, discharge UF filtrate appropriately, adjust the UF washing pressure, strictly control the chain speed and do not adjust it at will Kede technology has been focusing on cathodic electrophoretic coatings for 26 years It is the first high-tech enterprise specializing in the production of two-component cathodic electrophoretic coatings in China All along, with the core values of "creating the future with science and technology, winning the world with virtue" and the goal of becoming the most valuable electrophoretic coating enterprise in China, Kede technology has reached the international leading level in many properties and widely used products In the automotive industry, home appliances, household products, hardware and other fields, the main cooperative customers are Dongfeng Motor, Sany Heavy Industry, Liuqi, BAIC, Meizhi, zhilai technology, Huiyang electric, rapade, shuaichao industry, Haoyue home Address: No.13, Xinhui Road, Wusha Industrial Zone, Shunde science and Technology Industrial Park, Foshan City Marketing Department: Mr Zheng 13380287549 0757-26382347 Fax: 0757-26627888 website: http:// info@kodest.com