电泳涂料基础常识简介(国外英文资料).docVIP

电泳涂料基础知识简介(国外英文资料) Brief introduction to basic knowledge of electrophoretic coating Brief introduction to basic knowledge of electrophoretic coating 1 Introduction In the latter half of the twentieth Century, new technologies emerged in the painting of metal parts. These technologies have solved the problem of reducing or completely eliminating the flammable and toxic organic solvents. One of the ways to solve these problems is the development of waterborne coatings. In order to prevent the corrosion of metal, water soluble ion polymer is used as the film-forming material. In this system, the electrophoretic coating is a special coating for coating articles in a DC electric field in a bath. This method is very close to the current method. Only this method can endow complex workpieces with even coating. Now, the closed loop system is used for painting. Paint almost without loss. In view of this, in the promotion of environmental protection in twenty-first Century, electrophoresis coating and coating technology will continue to develop. This paper deals with the current state of the method and its future trends. 2 some materialized data Electrophoretic coating using water-soluble ionic polymer as binder, coated workpiece can be cathode or anode, although such coatings appeared in late 1940s, and the application is very limited, until 1960s by electrodeposition method will be transformed into the waterborne coating film. This is mainly due to the high surface tension of water as a solvent, due to the special physical and chemical properties of water. Will make the coating in the edge of the workpiece flow hanging, difficult to release, resulting in the drying process of film surface wrinkling, etc.. However, these shortcomings are overcome in the paint slot of the electric circuit. The mechanism of electrophoretic coating is that the solubility of ionic polymer changes with the change of pH value. The electrochemical reaction that occurs first during electrodeposition