When it comes to the surfaces, our
products
offer nothing but perfection
Our surfaces
and coatings
A nut is usually only a full-fledged product once it has the right surface. In cooperation with our long-standing and experienced partners, we can realise any type of surface for our products, even at short notice and in small quantities. Special coatings are also available. We are happy to advise you and find the ideal solution for your requirements!
Galvanic
coatings
Wolters offers a wide variety of galvanic coatings. Surfaces produced by electrolytic metal deposition in electroplating baths can be combined with a variety of our products. Individual methods can also be combined, which can often be handy depending on the application.
Electrogalvanising
in blue, white/transparent, yellow, black, olive green etc., with various layer thicknesses and passivation processes (thin/thick film). Passivation processes are a special and optional way to optimise the respective coating type to increase corrosion resistance while avoiding the use of Cr(VI).
Zinc iron plating
enhances corrosion protection and improves the appearance of your part due to the highly uniform layer thickness distribution without the use of Cr(VI). Slide coating permits defined adjustment of the friction coefficients depending on the application.
Zinc nickel coating
offers an extremely high level of corrosion protection and a high thermal load capacity free of Cr(VI) – in contrast to electrogalvanising. Sealants can be used to enhance coated nuts and are often used in conjunction with passivation to increase corrosion protection and for a more uniform appearance.
Thermal barrier coatings/hot dip galvanising
Wolters offers a wide variety of galvanic coatings. Surfaces produced by electrolytic metal deposition in electroplating baths can be combined with a variety of our products. Individual methods can also be combined, which can often be handy depending on the application.
Mechanical plating
Mechanical galvanising produces similar corrosion resistance properties to electrogalvanising without the risk of hydrogen embrittlement.
The process is therefore an ideal alternative for hardened parts that are sensitive to hydrogen embrittlement due to the absence of heat from the treatment process.
Zinc flake coating
Zinc flake coatings are applied in non-electrolytic processes and offer excellent corrosion protection even at low layer thicknesses – making them the best choice for nuts that need to have optimum protection against corrosion while maintaining a good appearance and other functional properties.
Thanks to our long-standing partnerships with qualified coating applicators in the field of surface technology, we offer zinc flake coating from well-known manufacturers to meet your corrosion protection requirements.
Phosphate coating
In order to phosphate coat products, a phosphate layer is applied to the nut in a special chemical pickling process that takes place in an immersion bath. Phosphating only offers temporary corrosion protection and is usually an intermediate step for further surface treatments as the layer structure is ideally suited as a basis for paints or similar coatings, but can also serve other functions (e.g. electrical insulation).
Lubricant
In surface technology, lubricants are not directly used as an independent coating, but they are often an indispensable part of a full-fledged coating in light of the corresponding requirements. Lubricants are primarily used to control friction and are combined with various types of coatings to achieve an optimal surface result.
Thread locks & coatings
In contrast to mechanical thread locks, chemical thread locks may be required whenever mechanical locks are not possible due to the geometry of a nut or the specific application. Adhesive, clamping or also sealing chemical thread locks are primarily designed to maintain the frictional lock and the initial load, thereby effectively securing the fastening.
Thread locks and coatings also include special products and processes to protect the thread of nuts. In this way, undesired surfaces or weld beads are prevented from adhering to weld nuts.
Other coatings
In addition to the above coatings, there are many other coating processes that may be necessary or preferrable depending on the application, for example:
Sherardising: produces a zinc alloy with the base material by diffusion. This process makes it possible to avoid any pretreatments that would result in hydrogen embrittlement.
Copper electroplating: typically used when thermal and electrical conductivity or a base for other types of coating is required. In addition to providing reliable protection against corrosion, copper electroplating helps achieve low hardness and strong adhesion.
Electroless nickel plating: coating process for achieving a uniform layer thickness and very good applicability even with complex geometries.
