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Auto Body Surface Treatment: the patented Two-Step Process

Henkel, in cooperation with Audi, has developed an auto body pre-treatment process. With an aluminum content of up to 100 percent the patented two-step process enables surface treatment of multi-metal auto bodies.

The aluminum content of mixed material bodies rises as the volume of waste products increases in conventional zinc phosphating processes. It is very costly to remove these waste products from the pre-treatment bath and the surfaces that are treated in them.

The Bonderite two-step process pre-treats them due to the different surface properties of steel and aluminum body components in two stages. This while reducing the disadvantages of the current process allows more aluminum to be used i.e. energy and chemical use decrease during the production process. The associated downtime, waste volumes and servicing expenses are also reduced. The first company to integrate this method into its processes was Audi. The global standard for pre-treatment of auto bodies with a high aluminum content has now become and is applied by leading automobile manufacturers around the world.


Following advantages are offered by this suitable two-step process surface treatment method:

  • Thanks to reduced waste, energy and chemicals resource-efficient
  • Enables pretreatment of body shells with an aluminum content of up to 100%