Dalian metal plastic coating is heated and melted. For wire, when the end enters the high-temperature area of the heat source, it is heated and melted; For powders, they enter the high-temperature area of the heat source and are heated, melted, or softened during their movement. During the jet flight of melted or softened fine particles, the particles are first accelerated to form a particle flow, and as the flight distance increases, the particle velocity gradually decreases.
It can form coatings on various substrate materials, including metal substrates, ceramic substrates, plastic substrates, wood, and even cardboard. The range of materials to be sprayed is also very wide, almost unrestricted, and the coating deposition efficiency is high, especially suitable for depositing thin film coatings. The thickness of the coating can be controlled and can vary widely, from tens of micrometers to a few millimeters, and even up to 20mm thick. On the premise of meeting the strength requirements, ordinary materials can be used instead of precious materials for the substrate of the parts, and only high-quality materials can be used for the coating, making "good steel used on the blade", and it can also be spray formed.
Dalian metal plastic coating contains varying degrees of pores, which are generally inferior to overall materials for applications such as corrosion resistance, oxidation resistance, and insulation. But it can be improved through methods such as composite coating system design. The working conditions during manual operation of thermal spraying are poor, with problems such as noise, dust, heat and arc radiation. It is necessary to pay attention to ventilation in the operating room and strengthen labor protection measures.
When the spraying position is a part of the surface of the workpiece, a spraying groove must be opened on the substrate at the position where spraying is required, and the two ends of the spraying groove must be chamfered, and the chamfer cannot exceed 45 °, generally 45 ° or 30 °, with a width of not less than 1mm; The spraying position shall not have obvious knife marks, local depressions, peeling or other defects on the surface after machining, and shall not have obvious burrs; The vast majority of post coating processing uses grinding or polishing, with a single feed rate controlled within 0.01mm for rough grinding and 0.005mm for fine grinding; Attention must be paid to the protection of the spraying position during the processing of non spraying positions.
There are many surface treatment processes for metal materials (such as stainless steel, zinc alloy, aluminum alloy, etc.) and plastics (such as nylon, PP, ABS, PC, etc.) coated with Dalian metal and plastic, such as electroplating, painting, water transfer printing, etc., but the most common one is mainly painting. The methods for solving the problem of paint peeling on metal and plastic surfaces include corona discharge, flame treatment, surface polishing, etc. However, these are relatively traditional methods with complex operation processes that cannot effectively and stably solve the problem.
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