客车涂装底层材料配套性分析

针对南方客户在使用我司客车一段时间后，车身涂层不同程度出现了起泡的质量问题，进行了现场查看，发现起泡位置在车身左右侧蒙皮，且发生在涂层最底层。初步分析原因是热镀锌板+阴极电泳漆 +原子灰三者之间配套存在问题，通过热镀锌板 +阴极电泳漆 +原子灰三者之间的耐高温 80 ℃配套试验，以及室外曝晒试验，得出镀锌板表面是否钝化、电泳漆膜致密程度和原子灰苯乙烯含量是造成涂层底层起泡的主要原因。为了控制涂层起泡问题，重新修订了我司原子灰、镀锌板、电泳漆的技术标准以及部分工艺文件。

Analysis on the Compatibility of Bottom Layer Materials for Passenger Coaches

Regarding the quality problem of blisteringoncoatingsin different degrees after some passenger coaches were used by customers in southern areas for a period of time,it was found on sites that the blistering position was on the left and right sides of the body skin,and occured at the bottom of the coatings. Through preliminarily analysis,the reason was found that there were some problems in the compatibility of hot galvanizing steel plate,cathodic electrophoretic paint and putty. A compatibility test was carried out at 80 ℃ with hot galvanizing steel plate,cathodic electrophoretic paint and putty,together with out door exposure test,it was found that the passivation of surface of galvanized sheet,the density of electrophoretic paint film and the content of styrene in putty were the main cause of bottom coatings blistering. In order to control coatings blistering problem,the technical specification of putty,galvanizing steel plate and cathodic electrophoretic paint and some process documents were revised.