Marcopol. Corrosion protection for construction without secrets
A comprehensive offer for construction, furniture and industry distinguishes us in the domestic fasteners market, also in terms of attention to the issue of corrosion protection of coatings. What protections do we offer for bolts and fasteners for steel structures?
Hot-dip galvanizing or flake coating?
When the fasteners we design will operate in decidedly more aggressive environments, they require coatings with increased corrosion resistance. An example would be outdoor environments, where the fasteners used are subjected to the effects of typical atmospheric factors – especially moisture.
The corrosion resistance of the coating can be increased, for example, by increasing its thickness. An immersion method is used to apply such coatings. Bolts are immersed in heated liquid zinc. The thickness of the resulting layer (ranges from 20 to a maximum of 50 microns) depends on the process used, the temperature and how long the product in question is kept in the molten zinc. The coating that is eventually obtained by the process described above is commonly referred to as hot-deep galvanized. This type of coating is often used for structural joints such as structural bolts or mechanical anchors.
Writing about protective coatings used in structural joints, it is impossible not to mention flake zinc plating technology, often called lamellar zinc. This is a mixture of zinc and aluminum flakes, enriched with bonding and hardening additives. The coating of flake zinc shows very high corrosion resistance to: atmospheric agents and chemicals.
In the construction sector, products coated with this coating are finding an increasingly wide audience. Compared to hot-dip galvanizing coating, flake galvanizing achieves comparable corrosion resistance with a layer that is more than 3 times thinner. This is important in products such as bolting assemblies where the application of hot-dip galvanizing coating requires that these assemblies be made in advance to special dimensional tolerances on the threads. The appropriate tolerances will allow the two components to be bolted together after the protective coating is applied. Flake zinc, the thickness of which is considerably less than hot-dip galvanizing such execution does not require, which is its undoubted advantage.
Ruspert Silver – up to 1500 hours in the salt chamber
Among the coatings with increased corrosion resistance , which we use for structural fasteners, we can also include a coating with the proprietary name “Ruspert Silver”. This is a multilayer protective coating made up of a minimum of 3 layers: a traditional coating – galvanized zinc, a chemical conversion layer applied over it, and a closing ceramic layer. This results in durable protection with high corrosion resistance. All this is sealed with a ceramic layer. If necessary, it can be sealed with an additional film. This increases its corrosion resistance for up to 1,500 hours in a salt chamber. Our screws for fastening sandwich panels and structural self-drilling screws for fastening sheet metal are covered with just this coating.
For us, nothing is impossible!
Using our knowledge and experience, we help you choose the right anti-corrosion protection. If you would like additional information on our offer for the steel construction industry and beyond – feel free to contact us!
