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目的：通过优化铝药筒预处理及阴极电泳涂漆工艺参数,设计专用挂具等,提高涂漆制品良品率。方法分析铝药筒不良品漆膜疵病,依据阴极电涂漆的基本原理,明确电泳漆相关工艺参数对铝药筒电泳涂漆及漆膜性能的影响,调整施工槽液温度为29~31℃,施工电压为170~175 V,槽液固体份为13%~15%,槽液电导率为900~1300μs/cm,阳极液电导率为500~700μs/cm,漆膜烘干温度为175℃,烘干时间为29~30 min。对铝药筒的预处理工艺进行分析,明确铝药筒预处理基体发黑、漆膜结合性不良的影响因素。结果经过试验,降低除油液中碱的含量10~15 g/L,降低热水洗的温度10℃左右,可以确保油污去除彻底且基体金属不过腐蚀、不发黑。同时,根据铝药筒的材质及结构特点,对其设计专用挂具,确保涂漆导电一致性。调整电泳漆相关工艺参数后,漆膜厚度一致性得到控制,解决了药筒色差明显、漆膜结合性差等问题,产品外观质量明显提高,装配漆膜无脱落现象。结论通过优化预处理及电泳涂漆工艺参数,加强过程监控,采用改进后的挂具等手段,大幅度提高了铝药筒阴极电泳涂漆的良品率。

ABSTRACT:Objective Through the optimization of parameters for aluminum cartridge pretreatment and cathodic electrophoretic coating process, designing special racks etc. , the yield rate of painting products was improved. Methods Defect analysis was con-ducted for aluminum cartridge defective film. According to the basic principle of cathodic electrophoretic coating, the effects of rel-evant process parameters of electrophoretic paint on the properties of aluminum cartridge electrophoretic paint and coating were clar-ified. The construction bath temperature was adjusted to 29~31℃, the work voltage was 170~175 V, the bath solid content was 13% ~15%, the conductivity of the bath was 900 to 1300 μs/cm, the conductivity of the anode solution was 500 to 700 μs/cm, the film drying temperature was 175 ℃, and the drying time was 29~30 min. The aluminum cartridge pretreatment process was analyzed, and the influencing factors for matrix blackening and film binding problems during aluminum cartridge pretreatment were clarified. Results The test showed that by reducing the alkali content by 10~15 g/L and the temperature of the hot washing water by about 10 ℃, the complete removal of oily dirt could be ensured and the substrate metal was not corroded and became black. At the same time, according to the material and structure characteristics of aluminum cartridge, special hanging tools were designed to ensure the consistency of the conductivity of the paint. After adjusting the technical parameters of the elctrophoretic paint, the film thickness uniformity was under control, the problems such as obvious color difference on the cartridge and poor binding of the film were solved, the appearance quality of the product was significantly improved, and the assembly film showed no shedding phenome-non. Conclusion Through the parameter optimization of pretreatment and electrophoresis coating process, strengthening the process monitoring, using the improved hanger, the yield rate of the aluminum cartridge cathodic electrophoretic coating was greatly im-proved.