Behaviour of composite materials in nickel-phosphorus-boron deposits on mild steel

The bath composition for deposition of nickel-phosphorus-boron has been standardized as reported earlier. The present study consists of incorporation of silicon carbide, tungsten carbide, boron-carbide and alumina in Ni-P-B alloy deposit on mild steel with and without current. The operating conditions like current density, temperature, pH and time to get uniform deposit were standardized. The physical properties of Ni-P-B plus composite coated mild steel panels were determined and the structure of the deposit was examined under SEM. The corrosion resistance of the coating was evaluated by electrochemical measurements and weight loss. It was shown that incorporation of particular material improves the corrosion resistance of Ni-P-B coatings on mild stee