Pretreatment Replaces Zinc Phosphating for Auto Bodies

Chemetall’s Oxsilan pretreatment has been used to replace zinc phosphating at the Mercedes-Benz plant in Gaggenau, Germany.

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Chemetall’s Oxsilan pretreatment has been used to replace zinc phosphating at the Mercedes-Benz plant in Gaggenau, Germany. According to the company, more than 1,400 auto body parts are manufactured, pretreated and painted daily at the automaker’s pressing plant, including doors, trunk lids, fenders and engine hoods. Some are galvanized steel, while others are made from aluminum, and adapting baths to this mix of metals can be complex and disposal of heavy metals expensive.

Oxsilan is eco-friendly, free from heavy metals and compatible with multiple metals. It operates at room temperature and does not require cost-intensive bath heating, enabling the Gaggenau plant to decrease the temperature of the cathodic electro dip bath and the voltage. This resulted in reduced costs associated with energy consumption, wastewater treatment, bath desludging and disposal, and labor, Chemetall says. It also is said to be safer for employees than the nickel-containing zinc phosphating.