Surface Layers and Creep Corrosion

If required, reaction layers with very good adhesive properties will afterwards be applied to the clean surface, by targeted chemical reactions under exactly defined conditions. Then, bonding on the surface is possible. For this purpose, chemical and electrochemical prepreparation methods are used that, however, require a lot of time and effort, as already explained. 

Contamination Adsorption layer Reaction layer (Cold) deformed layer 

Finally, an important difference between mechanical and chemical surface pretreatment methods should be pointed. Concerning their effects, the former are only limited to the adhesive surface area, that is, they are not able to protect the neighboring areas of the adhesive surface against possible stress from the ambience. 

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