• Chemetall Rai India Limited

Metal Pretreatment Coatings

Chemetall is a leading supplier of chemical products to general manufacturing industries. Producers of metal furniture, electrical enclosures and metal fasteners are among the industries served. Oxsilan® is an eco-friendly solution for metal pre-treatment. This is a new alternative for metal pretreatment which offers many advantages compared to the conventional conversion coatings: significant process cost savings; less water and energy consumption, easy waste water treatment; higher productivity; less stages (no activation and passivation), shorter treatment time; excellent quality; and very good corrosion resistance and paint adhesion. The Oxsilan process is environmentally-friendly and does not contain any phosphates or hazardous heavy metals. Oxsilan is suitable for a wide range of metals as well as multi-metal substrates. The products are based on functionalised organo-silane polymers that are selected to deliver the required performance characteristics with respect to anti-corrosion and paint adhesion properties. Oxsilan organo-silane polymers react at room temperature with hydroxides present in the metal oxide layer of cleaned metal substrates to form strong covalent bonds with the metal substrate. As the Oxsilan film dries neighbouring hydroxyl groups react with each other to form a dense, interpenetrating, crosslinked network that is chemically bound to the metal surface. Process characteristics: Application – spray, dip, roll, etc; bath temperature – low to ambient; contact time – 1 second – 2 min; pH range 4-6; drying, if required – 60-120°C; no activating step is required; and no further passivating step is required.