Kautschuk Gummi Kunststoffe, Vol.50, No.11, 778-783, 1997
Improved tire safety and life by a new wire/rubber adhesion system
In the dual layer coating, NiZn which is difficult to draw tends to flow into the ZnCo inner layer coating or wears off during the drawing process. Ni does not participate in the wire/rubber adhesion bond contrary to the state-of-the-art and therefore is not necessary for wire/rubber adhesion. A single layer of ZnCo is sufficient in which Co is concentrated at the Fe interface and imparts a better corrosion performance. Drawability of the ZnCo can be obtained by reducing the thermal treatment of the wire during drawing by: a) using a plating morphology with mixed crystal orientation, b) avoiding W-carbide dies in the last drawing process (and elimination welding), c) using thermally stable lubricants. Prototype passenger tyres with the new adhesion system were tested in laboratory and Weld tests up to 110 000 km, showing superior corrosion resistance.
Keywords:ELECTRODEPOSITS