In cooperation with Audi, Henkel has developed an auto body pre-treatment with a patented two-step process, enabling surface treatment of multi-metal auto bodies with an aluminium content of up to 100%. In zinc phosphating, which was the conventional process, the volume of waste products increases as the aluminium content of mixed material bodies rises. These are very costly to remove from the pre-treatment bath and the surfaces that are treated in them.(…)
via Sustainable automotive surface treatment | Fastener + Fixing Technology.