【摘要】 针对铝合金2A12基体开展冰射流表面脱漆试验研究,重点研究了在定点喷射条件下,冰射流喷射压力和喷射时间对表面脱漆效果和基体表面形貌的影响。试验结果表明,在0.2MPa喷射压力下,冰射流可有效清除铝合金表面有机油漆涂层,而且喷射压力越高,表面脱漆就越彻底。在各种冰射流条件下,脱漆后的基体表面粗糙度不存在明显的变化规律,同时基体表面的SEM图反映出在较低喷射压力0.5MPa下,基体表面未发生明显塑性变形;在0.7MPa喷射压力下,经过7s喷射时间,基体表面会出现少量由高速冰粒冲击产生的冲蚀坑,而且喷射时间为15s时,冲蚀坑的数量有所增加。更多还原

【Abstract】 Ice jet(blasting) technology shows a promising prospect of application and extension in surface cleaning and depainting engineering because of its environmentally friendly feature.The main objective of this work is to present a deeply experimental study on the organic paint removal from aluminum alloy(2A12) substrates and the surface damage development by ice jets.The effects of ice blasting pressure and blasting time on de-painting and damage to the substrate were mainly concerned.It was shown that at blasting pressure of 0.2MPa,organic paint coatings can be stripped from the 2A12 substrates.The paint coatings,moreover,are removed more effectively with increasing blasting pressure.Little changes of the roughness of the blasted substrate surface can be observed.SEM images showed little plastic deformation at the blasting pressure of 0.5MPa existed on the surface.Whereas,a few of impact craters due to impact of high-velocity ice particles appeared at 0.7MPa for 7s of exposure time with its number increasing obviously for 15s.更多还原