E-mobility Competence Center

Light, efficient, acid-resistant

Solutions for e-mobility

Specific task E-Mobility

The battery pans of a lithium ion pack in a compact class electric vehicle are to be made of an acid and weather resistant material. The use of high-voltage technology in e-mobility also increases safety requirements, especially with regard to crash behavior. Due to the exposed position in the lower part of the vehicle, there is also a requirement for excellent corrosion protection.

For this purpose, the basic material aluminium is first passivated and compacted. Pickling passivation reliably removes soiling (separating agents, drawing oils, greases, etc.) as well as the natural oxide layer of the aluminium. The applied passivation ensures that the surface has precisely defined properties that are required for reliable further processing (e.g. bonding, welding, coating, vulcanisation).

Properties of passivated aluminium:
  • 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 coatings are an excellent basis for subsequent processes such as welding, painting, bonding, vulcanizing
  • Environmentally friendly process
Advantages of aluminium:
  • Simple processing
  • strength and impact resistance
  • Protection against corrosion
  • Ignores temperature changes
  • Impermeability to vapour
  • UV resistance
  • Hygienic light metal
  • Electrical conductivity and magnetic neutrality
  • Good recycling opportunities
Specific task E-Mobility

If battery housings are made of steel instead of aluminium, a galvanically deposited zinc-nickel alloy is suitable as acid and corrosion protection, which also offers the advantage of excellent temperature resistance. Furthermore, the after-treatment with selected TOPCOATS makes it possible to significantly increase corrosion resistance and media resistance.

Properties zinc nickel:
  • Economic procedure
  • High long-term corrosion protection
  • Bending and flanging capability
  • Increased temperature resistance
  • High adhesive strength of the passivation layers
  • Plant technology: Partial coating possible
  • Internal coating by internal anode technology
  • Appealing optics
  • Environmentally friendly