Coating knowledge: coating process of automobile coating production line

Core tip: the coating process of automobile coating production line can be generally divided into two parts: one is the surface treatment of metal before coating, also known as pretreatment technology; the other is the construction process of coating The surface treatment mainly includes the removal of oil, dust and rust on the surface of the workpiece, as well as the removal of the old coating layer during the repair operation, so as to improve the surface state of the workpiece It includes machining and chemical treatment of workpiece surface according to various specific conditions, such as phosphating, oxidation and passivation treatment Coating process of automobile coating production line Antirust coating process of construction machinery can be generally divided into surface before coating Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: the coating process of automobile coating production line can be generally divided into two parts: one is the surface treatment of metal before coating, also known as pretreatment technology; the other is the construction process of coating The surface treatment mainly includes the removal of oil, dust and rust on the surface of the workpiece, as well as the removal of the old coating layer during the repair operation, so as to improve the surface state of the workpiece It includes machining and chemical treatment of workpiece surface according to various specific conditions, such as phosphating, oxidation and passivation treatment Coating process of automobile coating production line engineering machinery antirust coating process can be generally divided into surface treatment process before coating and antirust primer coating process Surface treatment is one of the important processes of antirust coating The quality of antirust coating of construction machinery depends on the surface treatment to a great extent According to Imperial Chemical, coating life is restricted by three factors: surface treatment, accounting for 60%; coating construction, accounting for 25%; coating quality, accounting for 15% Construction machinery industry, different parts of the surface treatment Mechanical cleaning can effectively remove the rust, welding slag and oxide skin on the workpiece, eliminate the welding stress, increase the bonding force between the antirust coating and the metal matrix, so as to greatly improve the antirust quality of engineering machinery parts Sa2.5 required by mechanical cleaning standard The surface roughness shall be 1 / 3 of the thickness of antirust coating The steel shot used for shot blasting shall meet the requirements of gb6484 The surface treatment of sheet metal stamping parts is generally called chemical surface treatment The process flow is: pre degreasing → degreasing → hot water washing → cold water washing → acid washing → cold water washing → neutralization → cold water washing → surface adjustment → phosphating → cold water washing → hot water washing → pure water washing → drying the above process can also be adjusted according to the oil and rust conditions of sheet stamping parts, or acid washing or pre degreasing process is not required Degreasing and phosphating are the key processes in chemical treatment, which directly affect the quality of chemical treatment and antirust coating The relevant process parameters and auxiliary equipment are also important factors affecting the surface treatment quality Due to the wide range of construction machinery, many specifications, the weight of the whole machine and large parts, spray coating is generally used Spraying tools include air spray gun, high pressure airless spray gun, air assisted spray gun and portable electrostatic spray gun The spray efficiency of air spray gun is low (about 30%), and the high-pressure airless spray gun wastes paint The common feature of the two is that the environmental pollution is serious, so they have been and are being replaced by air assisted spray gun and portable electrostatic spray gun For example, caterpillar, the first construction machinery company in the world, uses air assisted spray gun for spraying, and uses portable electrostatic spray gun for thin plate covering such as engine hood The coating equipment for construction machinery generally adopts the more advanced water rotary spray booth Small and medium parts can also use water curtain spray booth or pump less spray booth, the former has advanced performance, the latter is economical, convenient and practical Due to the heavy weight and large heat capacity of the whole machine and parts of the construction machinery, the drying of the antirust coating generally adopts the drying method of uniform baking and hot air convection The heat source can be adjusted to local conditions, such as steam, electricity, light diesel, natural gas and liquefied petroleum gas 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,