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Materials have very different physical, chemical and tribological properties. Physical properties are fundamentally nuclear physical and electrical properties such as thermal conductivity or also ferromagnatical and optical properties such as thermal expansion … Chemical and tribological properties are, for example electrochemical corrosion, scaling, crevice corrosion caused by tension, material failure, boundary areas and adhesion of surfaces … An understanding of the formation of coating and coating properties requires detailed knowledge: in particular of the substrate (material), the material which forms the coat, the defined purpose of the coating and the type of bonding conditions and the sequence of the individual procedural components in the area near the surface.
Every surface is different and acts differently accordingly. However in order for it to be able to fulfil the requirements placed on it, for example wear resistance and corrosion resistance, strength, anti-friction properties or optic, it is important to change it whenever possible, according to precisely defined properties. The aim is to generate a new surface behaviour for specific purposes!
The procedures of surface technology have both technological similarities as well as clear technological differences. Differences arise in the properties of the coats and their physical-chemical behaviour towards the substrate (material) surfaces. DIN EN 8580 divides the procedures into the physical-chemical procedures in the coat-forming material. In order to achieve the specified goals ‘defined surface properties’, the substrate surfaces must be changed in their structure.