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考察了3种表面处理方法酸蚀后打磨、酸蚀后喷砂、直接喷砂及不同砂子对橡胶型钴盐胶粘剂与Q235钢粘合强度的影响。结果表明,酸蚀后打磨的Q235钢与胶粘剂的粘合效果最好,直接喷砂的粘合效果较差;经SEM观察及能谱分析可知,酸蚀打磨后的Q235钢,表面较平滑,氧含量少;酸蚀后,喷砂表面孔洞增多,氧含量增多,且有破碎的砂子嵌入在钢片里;直接喷砂表面氧含量高,表面有大小、深浅不一的“坑”、较深的孔洞和缝隙,含有金刚砂的残留成分。表明喷砂后钢片表面残留的砂子、孔洞和缝隙是导致胶粘剂与钢片粘合强度下降的主要原因。两种不同砂子中,用废旧砂轮粉碎的砂子对Q235钢进行喷砂处理,胶粘剂与钢片的粘合效果优于普通的金刚砂;对同一类型的砂子,用粒径为150～180目的砂子对钢片进行喷砂处理,胶粘剂与钢片的粘合效果好一些。
The effects of three kinds of surface treatment methods, such as acid etching, sandblasting after acid etching, direct sandblasting and different sand on the bond strength between rubbery cobalt salt adhesive and Q235 steel were investigated. The results show that Q235 steel polished by acid etching has the best adhesive effect with the adhesive, and the direct sandblasting has poor bonding effect. SEM observation and energy spectrum analysis show that Q235 steel polished by acid etching has a smoother surface, The content of oxygen is small, and the content of oxygen is small; after acid etching, the number of holes on the sand blast surface increases, the oxygen content increases, and broken sand is embedded in the steel sheet; the direct blasting surface has high oxygen content, , Deeper holes and crevices, containing residual components of emery. It is indicated that the sand, holes and cracks left on the surface of the steel after blasting are the main reasons leading to the decrease of adhesive strength between the adhesive and the steel sheet. In two different kinds of sand, Q235 steel was sandblasted with the sand crushed by the used grinding wheel, and the bonding effect between the adhesive and the steel sheet was better than ordinary emery. For the same type of sand, sand of 150-180 mesh Grit blasting steel, adhesive and steel bonding effect is better.