Firstly, from the perspective of the coating itself, its composition and quality directly affect the spraying effect. The solvent and solid particles in the coating should be thoroughly mixed evenly to ensure the stability of the coating. If the solvent evaporates unevenly or the particles are too large, bubbles may form on the surface of the coating. In addition, the viscosity of the coating also needs to be appropriate, as excessive viscosity can increase the possibility of bubble formation. Therefore, when preparing coatings, selecting material ratios and particle sizes reasonably, and accurately controlling viscosity are important steps to avoid bubbles.
Secondly, the condition and treatment of the substrate are crucial for the spraying effect. There may be oxide layers, grease, or impurities on the surface of aluminum, which can affect the adhesion of the coating to the substrate. To ensure the spraying effect, it is necessary to first thoroughly clean and treat the substrate. Some chemical pretreatment methods, such as acid washing, degreasing, and phosphating, can effectively improve the adhesion of coatings. If there are uneven protrusions on the surface of the substrate, it can also lead to the formation of bubbles in the coating after spraying. Therefore, careful inspection and preparation of the substrate should be carried out before construction.
Finally, the construction environment and operation will also directly affect the occurrence of aluminum eruption. Factors such as temperature, humidity, and wind may affect the drying and curing of coatings. If the environmental humidity is too high, the solvent evaporation rate in the coating will be affected, thereby increasing the probability of bubble formation. In addition, operational details such as coating angle, thickness, and speed can also affect the quality of the coating. Unreasonable construction operations may lead to the formation of ripples on the surface of the coating, which in turn can cause bubbles.
In summary, the reasons for aluminum spray foaming involve multiple aspects such as coating composition, substrate treatment, and construction operations. To avoid this problem, it is necessary to start with the formulation of the coating, select appropriate material ratios and particle sizes, and control viscosity; Clean and treat the substrate before spraying to ensure that the coating can adhere firmly; At the same time, it is crucial to master the correct operating techniques in an appropriate construction environment.
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