浅谈汽车涂装下边梁内腔电泳膜厚提升分析及对策

Analysis and Countermeasures on the Improvement of Electrophoretic Film Thickness in Inner Cavity of Lower Side Beam of Automobile Painting

针对市场反馈的锈蚀问题,通过对锈蚀部件进行分析,确定研究课题为下边梁电泳内腔膜厚,通过对电泳成膜过程中电解、电泳、电沉积、电渗4个电化学反应参与因素进行分析,识别出影响电泳成膜的电压、槽液温度、电泳时间、阴阳极面积比、溶剂含量等关键参数,并进行参数分析及DOE试验、生产线实际生产验证,得出溶剂含量在0.70%、温度在31 ℃、电泳电压在320 V的条件下下边梁内腔膜厚的最低值从6.0 μm提升至10.8μm,满足了产品防腐要求。

In response to market feedback on rust problems,through analysis of rusted components,the research topic was determined to be the thickness of the electrophoresis inner cavity of the side beam,and the four electrochemical reactions involved in electrophoresis,electrophoresis,electrodeposition,and electroosmosis were identified and analyzed during the electrophoretic film formation process.Identify the key parameters that affect electrophoresis film formation,such as voltage,bath temperature,electrophoresis time,cathode-to-anode area ratio,solvent content,etc.,and perform parameter analysis,DOE test,and actual production verification on the production line.The solvent content is 0.70%and the temperature is 31°C,electrophoresis voltage under the condition of 320 V,the minimum value of the inner cavity film thickness of the side beam is increased from 6.0μm to 10.8μm,which meets the anti-corrosion requirements of the product.