Surface treatments

Available surface treatments



Zinc plaiting (electrolytic)


Zinc layer, which is applied to the metal as galvanic corrosion protection.
Bulloneria del Toce offers different types of galvanizing to serve every application, from standard white to iridescent (thick film passivation) with different corrosion resistance.
Any type of electrolytic galvanizing can be delivered with:

  • Sealant to increase corrosion resistance.
  • Lubricant to achieve a controlled coefficient of friction
  • Thread lock / microencapsulation for special applications

Zinc Nikel


Zinc layer containing 12 - 16% nickel alloy
In contrast to normal electrolytic galvanizing, these surfaces are much more corrosion-resistant with the same layer thickness.
Bulloneria del Toce supplies zinc-nickel coated screws in both transparent and black, and like normal electrolytic zinc plating, you can choose:

  • Sealing to increase corrosion resistance
  • Lubricant to achieve a controlled coefficient of friction
  • Thread lock / microencapsulation for special applications

Zinc Iron


Zinc layer with 0.3 - 1% iron alloy, deep black colour.
This surface is very corrosion-resistant and is often used for applications where aesthetics plays an important role (visible parts).
Bulloneria del Toce is able to supply screws with zinc-iron both transparent and black, and as with normal galvanizing, you can also choose:
  • Sealing to increase corrosion resistance.
  • Lubricant to achieve a controlled coefficient of friction
  • Thread lock / microencapsulation for special applications

Zinc-flake


Water-based coating with the addition of zinc and aluminium flakes in order to achieve a very high level of protection for metallic materials against environmental corrosion.
Annealing is not necessary because this method does not cause hydrogen embrittlement.
Bulloneria del Toce is able to supply galvanized screws in various layer thicknesses and colours, with a controlled coefficient of friction and also with thread locking:

Geomet – Delta Protekt

Hot dip galvanization.

This surface treatment results from immersion in molten zinc - i.e. at very high temperatures - and centrifugation of the parts to be coated, and leaves a zinc layer with a thickness that is over 50 my, which gives the part a very high level of corrosion resistance.