摘要
高泳透力电泳漆通过配套新的树脂/固化剂体系,降低了槽液VOC,提高了固体分,从而提高电泳槽液的电导率及电泳湿膜的电阻,最终实现泳透力的大幅提升。因此,它可在保证内腔膜厚达标的基础上,较大幅度地降低外板膜厚,从而降低材料成本。对4种不同厂家生产的高泳透力电泳漆的泳透力和漆膜性能进行了测试,筛选出综合性能较好的产品,将其与在线产品进行混槽切换试验,测试了不同混槽比例的槽液参数及其所得漆膜的力学性能和耐蚀性,考察了电泳电压对冷轧板和镀锌板漆膜厚度及库仑效率的影响,证明了新一代高泳透力电泳漆在涂装线与普通电泳漆进行混槽切换的可行性。在以上研究的基础上进行高泳透力电泳产品的切换混槽生产,而且经过8个月完成了切换,汽车内腔膜厚得到了大幅提升。某车型的门槛腔体电泳膜厚从混槽前的7.45μm上升到混槽后的13.82μm,B柱腔体膜厚从混槽前的6.60μm上升到混槽后的9.53μm,满足汽车内腔防腐膜厚要求。
An electrophoretic paint with high throwing power can be obtained based on a new resin/curing agent system to reduce bath＇s VOC and increase solid content, resulting in an increase in the conductivity of electrophoretic bath and in the resistance of electrophorised wet film, and finally achieving a great improvement of throwing power. Its application ensures the thickness of internal cavity reaching the requirement of standard, and greatly decreases the thickness of outer plane, thereby reducing the cost of materials. In the paper, the throwing power and coating performance of the electrophoretic paints with high throwing power produced by four different factories were tested. The product with good comprehensive performance was selected, and then mixed with that used previously on the production line for a replacement test. The process parameters of the bath at various mixing ratios as well as the mechanical properties and corrosion resistance of the coatings obtained therefrom were examined. The effects of electrophoretic voltage on coating thickness and coulombic efficiency were studied with cold rolled plate and galvanized plate as substrates. The replacement of common electrophoretic paint by the new generation one with high throwing power via a gradual increase of its addition to the original bath was proved to be feasible. After eight months of dosing the high-throwing-power electrophoretic paint, the replacement was completed, greatly improving the thickness of coating on internal cavity of car body. For example, the coating thickness on sill cavity of a type of car was increased from 7.45μm before replacement to 13.82 μm, and that on B pillar was increased from 6.60 μm to 9.53 μm, meeting the thickness requirement of corrosion protective coatings for internal cavity of automobile.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2014年第14期616-620,共5页
Electroplating & Finishing
关键词
汽车涂装
电泳漆
泳透力
内腔
膜厚
混槽
automobile coating
electrophoretic paint
throwing power
internal cavity
coating thickness
bath mixing
