DACROMET ®


DESCRIPTION

It is an inorganic coating applied non-electrolytically. It consists of a coating containing zinc and aluminium flakes and chromium oxides.

This coating system provides a cathodic corrosion protection to the steel substrate. Zinc and aluminium are anodic metals and corrosion attacks first the zinc and aluminium containing layer and therefore protects the substrate against corrosion. The corrosion protection lasts acc. to the layer thickness of the deposited coating (mass per coated area).

APPLICATION OF DACROMET®

  • GRADE A: 24 g/m2 (aprox. 5 µm) Corrosion resistance to NSS: 500 hours red rust
  • GRADE B: 36 g/m2 (aprox. 8 µm). Corrosion resistance to NSS: 1000 hours red rust. Corrosion resistance to a SO2 containing environment. 3 rounds Kesternich test.

    • PROPERTIES

  • No hydrogen embrittlement


  • Bimetallic corrosion resistance. Good in contact with Al, Cr, Zn and Sn. Low in contact with stainless steel; very low over Cu, Ni, Pb and Mg


  • Resistance to corrosion cyclic tests. 3C of Renault, VW PV1210, Ford APG,…
  • Heat resistance. The properties of the coating are maintained up to 280 ºC.


  • Chemical resistance. Good chemical resistance to many organic solvents, gasoline, etc.


  • Parts coated with Dacromet do not need further rework (thread machining) before assembly to guarantee mountability


  • Metric screws < M22 show better results in corrosion resistance than other bolts with coating systems with higher layer thickness because fastener threads are not machined before assembly


  • Excellent corrosion resistance in sea or saline environments



    • DACROMET ® PRODUCTS


    DACROMET 320: : Base-coat of zinc, aluminium and chromium oxides
    DACROMET 500: Coating system with dry integrated lubricant designed for threaded fasteners. It provides the same properties like DACROMET 320 plus a lower coefficient of friction (0,15 ±0,03).

     

    Home