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Conversion coatings chromium(VI)-free

Passivation of aluminium

Passivation of aluminium: Procedure and advantages

The characteristics of aluminium surfaces can be improved exactly by depositing of a conversion coating. In this process, the non-uniform oxide film of the AL-surface is removed and replaced by a defined thin and resistant conversion layer.

The applied layers meet the requirements of the EU End of Life Vehicles Directive.

Further information on aluminium passivation

  • Improved corrosion protection
  • Excellent adhesion primer for paints and varnishes
  • The formation of the natural oxide layer is inhibited by the application of this extremely thin layer
  • These layers are an excellent basis for subsequent processes:
    • Welding
    • Paint
    • Glue
    • Vulcanize
    • Environmentally friendly process

Among others, meets the requirements of::


Porsche Standard PTL 7556
„Converse coating of Aluminium semis and aluminium components“


VW Standard TL 824 27
„Washing and passivation of aluminium parts“


Mercedes-Benz delivery specification DBL 4952
„Delivery specification for Aluminium surfaces in car body“
Version 10


BMW PV 97022
Procedural requirement „Conversion layers on Aluminium“

Ti conversion layer (Alodine 2040 / Bonderite M-NT 2040)

Umwelt­­relevanz: Chrom(VI)-frei, entwickelt für die neuen europäischen Umwelt-Richtlinien
Schicht­­auflage: 2 – 15 mg/m2
Korrosions­­schutz: Lagerschutz bis 3 Monate
Eigen­schaften: Verbesserung Schweißbarkeit und Adhäsion (Kleber und Lacke)
Temperatur: unempfindlich
Oberflächen­widerstand: < 20 μOhm/cm2
Anwendungs­bereiche: Aluminium-Knetlegierungen, Guss- und Schmiedeteile

Chrom III (Surtec 650)

Umwelt­relevanz: Chrom(VI)-frei, entwickelt für die neuen europäischen Umwelt-Richtlinien
Norm: z. B. VW TL 13750 V111
Schicht­dicke: 50-400 nm
Korrosions­schutz: bis zu 720 h Salzsprühtest nach DIN EN IS0 9227 – NSS (legierungsabhängig)
Farbe: schwach irisierende, sichtbare Schichten
Temperatur: hitzebeständig bis zu 100°C
Oberflächen­widerstand: < 0,8 mOhm/cm2
Anwendungs­bereiche: Aluminium-Knetlegierungen, Guss- und Schmiedeteile
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Hussein Ghazi

Katrin Unterseher

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