What is the corrosion-resistant cemented carbide in the mechanical seal material

Cobalt-based tungsten carbide is the most widely used cemented carbide for mechanical seals, but WC-Co cemented carbide is not suitable for corrosive occasions. In order to overcome the defect of poor corrosion resistance of the binder phase in WC-Co, a corrosion-resistant cemented carbide with Ni as the binder phase and WC as the hard phase emerged.

The performance of this type of alloy is similar to that of WC-Co cemented carbide, and its corrosion resistance is better. In its chemical composition，WC accounts for 89~94%, Ni accounts for 11~6%.The physical and mechanical properties of WC-Nii are shown in the table below. It has excellent corrosion resistance in acetic acid, sulfuric acid, caustic soda and other media, and has good corrosion resistance in hydrochloric acid and phosphoric acid.