Common knowledge of coating: solution to pinhole in automotive electrophoretic paint

Core tip: since 1977, the world's first production line of cathodic electrophoretic coating for automobile body was put into operation in the United States Over the past 30 years, with the development of cathodic electrophoretic coating, electrophoretic equipment and coating technology, cathodic electrophoretic coating has become a mature automotive body coating technology However, even so, in the production site, there will be film particles, pinholes, shrinkage holes and other defects Cathodic electrophoretic coating belongs to assembly line operation If the problem is not solved quickly, it will directly affect the continuity of production However, due to the different equipment, materials and processes on each site, the source of the problem will be caused Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Home of coatings: since 1977, the world's first production line of cathodic electrophoretic coating for automobile body was put into operation in the United States Over 30 years, with the development of cathodic electrophoretic coating, electrophoretic equipment and coating technology, cathodic electrophoretic coating has become a mature automotive body coating technology However, even so, in the production site, there will be film particles, pinholes, shrinkage holes and other defects Cathodic electrophoretic coating belongs to assembly line operation If the problem is not solved quickly, it will directly affect the continuity of production However, due to the different equipment, materials and processes on each site, the causes and solutions of the problems will be different This article aims at the pinhole defect of car body, discusses the causes and solutions Through the experiments and careful observation on the spot, the main factors causing pinholes were determined as follows: (1) there was not enough circulation in the electrophoresis tank corresponding to the middle cover plate, and concentration polarization occurred during electrophoresis In order to ensure the smooth up and down operation of the conductive rod, the electrophoresis tank is empty in the middle area of the conductive rod operation, and there is no electrode and pipeline The z-cycle effect in the middle of the two cabs is very poor, especially in the middle cover plate, which is difficult to reach at the side and bottom There is no window gap in front and back, and it is blocked by the front and rear walls of the cab The flow of the tank fluid is blocked at this place, so the cycle condition is very poor When the electrode starts to power on, the back wall of the front cab and the front wall of the rear cab face the electrophoretic paint in the same area Z which is very close to each other at the same time, and the circulation in this area is poor, so it is very easy to produce concentration polarization, and pinholes are very easy to appear Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,