Metal-based fasteners form an important component in any assembly system and must therefore have optimal qualities, whether it is of a corrosion-protective nature or prevents environmentally assisted cracking in the surface structure.
At the same time, the metal in the fasteners must be compatible with the material in the object to be joined, taking into account the conditions of use for the overall construction.
Such application components appear to a significant extent in an electrogalvanized design where the corrosion resistance is very limited and only suitable in non-corrosive indoor environments.
Through development phases of nano-based polymer treatment for hot-dip as well as electro- galvanized thin-sheet substrates, emphasis is placed on facilitating quality-oriented uniformity in the total assembly system, where the corrosion resistance must be extensive for each component and where the metal-based chemical structure is compatible.
Currently, fasteners in stainless steel grades are generally used for a variety of construction systems, where the geometric shape of construction elements consists of hot-dip galvanized sheet substrates with zinc coating thicknesses from 20-30mµ. Which amounts to a significantly increased corrosion value compared to electrogalvanized fastening details where the thickness of the zinc coating is usually based on 8-10 mµ.
In any context, the weakest element should be decisive for the overall corrosion resistance and in any construction.
In corrosive environments where bimetallic corrosion occurs rapidly, this is the result of incompatible metals.
The cost factor is also applicable in that the stainless alloys in fastening details often have a significantly higher price than electrogalvanized detail units.
An extensive scientific development of today's nano polymer for use in electrogalvanized fastening details has been carried out throughout the development phase. Organometallic chemistry based on catalytic performance has largely contributed to our discovery of new reaction values and physicochemical properties where solutions in the complexity of current corrosion resistance between different substrate values have been conceived.
In the main, this is based on electrogalvanized substrate surfaces with thicknesses 5mµ - 20mµ where certifications have been carried out. To a significant extent, an electrogalvanized surface structure with 8 mµ coating thickness implies a corrosion class conditioned to C-2/C-3. Approved test results conducted by KIWA show a significantly increased corrosion class corresponding to C5-M based on polymer-treated substrate with 8 mµ electrogalvanized design and correspondingly for hot-dip galvanized with 20-25 mµ.
The high performance requirements thus exceed corresponding fastening material in stainless steel alloys with grades 410/302/304 and include not only corrosion resistance, but also greatly increased barrier strength.
