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Adhesive bonding is a kind of surface phenomenon. A adhesive is a material that can be fixed together by a surface connection.
Quality. So the surface treatment before bonding is the key to the success of bonding. The only purpose is to ensure the surface treatment by adhesive joints form a solid and durable adhesive surface. The ideal bonding is to be adhered directly contact adhesive.
But there should be no oxide film, coating layer, chromate coating, phosphate coating between the adhesive and adhesive, also should not have silicone release agent. If the above middle layer is contained, these coatings are considered as "weak interfacial layer", which is similar to the adhesion of pressure sensitive adhesive tape to the surface of dispersed powder, which will not produce ideal bonding.

The quality control of the surface treatment process is of great importance. The new product should be tested repeatedly to determine whether the bonding process is suitable. In order to meet the requirements of bonding process and grasp enough data, simple lap shear tests and peeling tests are often used, or other more practical tests are made to determine the quality of surface treatment. In the establishment of good process control, the relation curve of the frequency of histogram (the occurrence rate of single value) and the strength of the specimen joint is often used.
The selection of surface treatment methods is also a systematic project. Many factors must be taken into consideration, such as
The size of the adhesive parts and the utilization of the equipment are one of the obvious factors. When cleaning in the bath, the active chemicals in the bath are quickly consumed, and if they are not added in time, or the accumulation of impurities in the liquid. A weak interface layer will be produced on the adhesive surface, resulting in poor bonding strength, which is easily ignored.