电泳工艺对车身防腐的影响研究
发布时间:2018-08-28 07:19
【摘要】:伴随着汽车工业快速发展,人们对汽车的品质要求越来越高。汽车腐蚀损坏是影响汽车品质的重要因素,因此,汽车的各种腐蚀防护措施就显得越来越重要。电泳涂装工艺是一种有机涂膜形成方法,其形成的电泳漆成膜质量的好坏,直接决定了整车的防腐蚀性能。本文选定东风柳州汽车有限公司某乘用车型,针对整车耐腐蚀性与车身电泳工艺进行了以下研究:(1)分析汽车的使用环境以及腐蚀现状,阐述了汽车防腐性能设计的必要性及防腐设计的主要方法,查找汽车使用过程中的腐蚀原因;(2)研究汽车防腐处理工艺中电泳涂装的反应机理及典型的电泳涂装工艺,对电泳工艺耐腐蚀性能的主要影响因素进行了讲解,分析了常见的电泳漆膜的性能评价标准及缺陷,对各项电泳缺陷问题进行了详细的调查及原因分析,制定了解决措施,并制定相关工艺规程及管理要求;(3)通过选用仿真软件中VPS/EDC、VPS/Toolkit模块对风行汽车新车型进行建模计算分析,模拟白车身在油漆槽中电流作用下车身上的电泳涂层的电沉积过程,在真正进行批量生产之前通过对白车身的任意位置的涂层厚度结果进行预测。结果表明这种仿真分析方法比较可靠,能够直观、量化的得出车身内外表面的成膜数据,也能显示各零件的最大、最小膜厚,节省了大量的时间和成本;(4)通过实车解剖,测定膜厚,观察电泳不上的部位,对电泳车身泳透力情况进行全面验证,并对泳不上电泳漆部位原因进行分析,主要是因为排气孔设置数量不够、孔径过小或位置不合理导致局部的气体无法排出,钣金结构间隙过小而产生电场屏蔽效应,并提供车身设计下一步改善的方向。
[Abstract]:With the rapid development of automobile industry, people are demanding more and more high quality of automobile. Automobile corrosion damage is an important factor affecting automobile quality. Therefore, various corrosion protection measures are becoming more and more important. Electrophoretic coating process is an organic film forming method. The quality of electrophoretic coating directly determines the anticorrosion performance of the whole vehicle. In this paper, a passenger vehicle of Dongfeng Liuzhou Automobile Co., Ltd. is selected, and the corrosion resistance and electrophoretic process of the whole vehicle are studied as follows: (1) the use environment and corrosion status of the vehicle are analyzed. This paper expounds the necessity of automobile anticorrosive performance design and the main methods of anticorrosion design, finds out the corrosion reasons in the process of automobile use, (2) studies the reaction mechanism of electrophoretic coating and typical electrophoretic coating process in automobile anticorrosive treatment process. The main factors affecting the corrosion resistance of electrophoretic process are explained, the performance evaluation standards and defects of the common electrophoretic coatings are analyzed, the problems of the electrophoretic defects are investigated and the reasons are analyzed in detail, and the solving measures are worked out. The related process rules and management requirements are established. (3) the electrodeposition process of electrophoretic coating on the white body under the action of the current in the paint tank is simulated by selecting the VPS/EDC,VPS/Toolkit module in the simulation software to model and calculate the new car model. The results of coating thickness at any position of the body are predicted before mass production. The results show that this simulation analysis method is reliable and can be used to quantify the film-forming data of the inner and outer surfaces of the body, and can also show the maximum and minimum film thickness of each part, thus saving a lot of time and cost. (4) through the actual dissection of the vehicle, Determine the thickness of the film, observe the parts not on the electrophoresis, verify the swimming permeability of the electrophoretic body comprehensively, and analyze the reasons for the location of the electrophoretic paint, mainly because the number of exhaust holes is not enough. Too small aperture or unreasonable position lead to local gas can not be discharged, sheet metal structure gap is too small to produce electric field shielding effect, and provide the direction of the next improvement of body design.
【学位授予单位】:湖南大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:U466
本文编号:2208690
[Abstract]:With the rapid development of automobile industry, people are demanding more and more high quality of automobile. Automobile corrosion damage is an important factor affecting automobile quality. Therefore, various corrosion protection measures are becoming more and more important. Electrophoretic coating process is an organic film forming method. The quality of electrophoretic coating directly determines the anticorrosion performance of the whole vehicle. In this paper, a passenger vehicle of Dongfeng Liuzhou Automobile Co., Ltd. is selected, and the corrosion resistance and electrophoretic process of the whole vehicle are studied as follows: (1) the use environment and corrosion status of the vehicle are analyzed. This paper expounds the necessity of automobile anticorrosive performance design and the main methods of anticorrosion design, finds out the corrosion reasons in the process of automobile use, (2) studies the reaction mechanism of electrophoretic coating and typical electrophoretic coating process in automobile anticorrosive treatment process. The main factors affecting the corrosion resistance of electrophoretic process are explained, the performance evaluation standards and defects of the common electrophoretic coatings are analyzed, the problems of the electrophoretic defects are investigated and the reasons are analyzed in detail, and the solving measures are worked out. The related process rules and management requirements are established. (3) the electrodeposition process of electrophoretic coating on the white body under the action of the current in the paint tank is simulated by selecting the VPS/EDC,VPS/Toolkit module in the simulation software to model and calculate the new car model. The results of coating thickness at any position of the body are predicted before mass production. The results show that this simulation analysis method is reliable and can be used to quantify the film-forming data of the inner and outer surfaces of the body, and can also show the maximum and minimum film thickness of each part, thus saving a lot of time and cost. (4) through the actual dissection of the vehicle, Determine the thickness of the film, observe the parts not on the electrophoresis, verify the swimming permeability of the electrophoretic body comprehensively, and analyze the reasons for the location of the electrophoretic paint, mainly because the number of exhaust holes is not enough. Too small aperture or unreasonable position lead to local gas can not be discharged, sheet metal structure gap is too small to produce electric field shielding effect, and provide the direction of the next improvement of body design.
【学位授予单位】:湖南大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:U466
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