Coating technology: the application of electrophoretic coating in automobile fastener

Core tip: at present, the surface protection technology of automobile fastener in China mainly includes oxidation (blackening), phosphating, electroplating (zinc, zinc nickel alloy, decorative chromium), Dacromet coating, etc However, with the rapid development of China's mechanical industry, higher and higher requirements are put forward for the quality of vehicle products The high safety, high environmental protection and diversified personality of vehicles determine the higher and higher requirements for fastener surface protection technology Thus, a cathodic electrophoretic coating process was developed So, what are the skills of cathodic electrophoretic coating process in the application of fasteners? First of all, according to the types of fasteners used in automobiles 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: at present, the surface protection technology of automotive fasteners in China mainly includes oxidation (blackening), phosphating, electroplating (zinc, zinc nickel alloy, decorative chromium), Dacromet coating, etc However, with the rapid development of China's mechanical industry, higher and higher requirements are put forward for the quality of vehicle products The high safety, high environmental protection and diversified personality of vehicles determine the higher and higher requirements for fastener surface protection technology Thus, a cathodic electrophoretic coating process was developed First, according to the types and performance requirements of fasteners used in automobile, the high strength grade 8.8 and grade 10.9 bolts used in automobile chassis, engine and transmission are tested The scheme is as follows: 1 Black cathodic electrophoretic coating, electrophoretic coating for fastener coating; 2 Black cathodic electrophoretic coating, the formula has been adjusted, which is suitable for fastener coating; 3 Black cathodic electrophoretic coating, electrophoretic coating for common parts coating Secondly, the main properties of fastener coating (plating) are tested, including corrosion resistance (salt spray test), hot and humid resistance and assembly performance It should be noted that at present, the domestic high-strength fasteners for automobile basically rely on imports, and an important bottleneck of fastener localization is the control of friction coefficient On the premise of meeting the assembly performance, the longer the salt spray resistance test and hot and humid resistance time is, the better In addition, when the pneumatic wrench is used for assembly, the paint film will not fall off, which are the key technologies of the electrophoretic coating process for fasteners The results show that the total friction coefficient and the dispersion (average value) of the friction coefficient are better than that of the zinc plating parts Among the three schemes, electrophoretic coating 1 is the best, with coating thickness of 15-18 μ m, salt spray resistance test of 240-1000h and low comprehensive cost of 15-20 yuan / mm2 Therefore, the following conclusions are drawn from the application test of electrophoretic coating on automobile fasteners 1 It is feasible to use electrophoretic coating for surface treatment of fasteners; 2 It is necessary to use special electrophoretic coating for fasteners in order to meet the quality requirements of fastener surface treatment; 3 Compared with electro galvanizing process, electrophoretic coating process has higher indexes and lower cost 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,