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目前国内工厂一般没有完整的涂装质量测试手段,即使有一些测试设备也不成龙配套,致使电泳涂装质量受到影响。因此,必须将影响电泳涂装效果的主要因素(如:槽液温度、电导率、pH值等)控制在工艺规定的范围内。一、温度的自动控制在同样的电压条件下,随着电泳漆漆液温度的提高,电泳电流升高,涂料粒子电泳速度加快漆膜厚度增加。温度过高,引起电解过程加速,气泡释放量增加,使漆膜粗糙、呈桔皮、流挂状态。若经常高温度时,工作液中树脂分子易产生氧化、聚合、交联、水解等化学变化,结果使漆液稳定性变差;相反,温度过低,电泳速度减慢,漆膜太薄。因此,必须要有适宜的电泳温度。一般控制在20～30℃为宜。温度自动控制的工作原理见图1。
At present, domestic factories generally do not have a complete coating quality test means, even if some of the test equipment is not Jackie Chan supporting, resulting in electrophoretic coating quality affected. Therefore, the main factors that affect the effect of electrophoretic coating (such as bath temperature, conductivity, pH value, etc.) must be controlled within the specified range of the process. First, the temperature of the automatic control Under the same voltage conditions, with the electrophoretic paint temperature increase, the electrophoresis current increases, coating particles electrophoresis speed to speed up the increase in film thickness. The temperature is too high, causing the electrolysis process to accelerate, the bubble release increased, the paint film rough, orange peel, sagging state. If the high temperature, the working fluid resin molecules prone to oxidation, polymerization, crosslinking, hydrolysis and other chemical changes, resulting in poor stability of the paint; the contrary, the temperature is too low, electrophoresis slowed down, the film is too thin. Therefore, there must be a suitable electrophoresis temperature. General control at 20 ~ 30 ℃ is appropriate. Automatic temperature control principle shown in Figure 1.