Vacuum Pump corrosion chemical nickel phosphorus processing

⑴ uniform coating thickness, the degree of dispersion of the electroless plating solution is close to 100%. Plating itself is an autocatalytic redox process, as long as the catalytic base can come into contact with the solution plating, is almost a copy substrate shape, to the extent copying, not the same as the plating occurs due to the uneven distribution of the power line The coating thickness caused by uneven. ⑵ Electroless plating not only on the metal surface, through the activation of a special, sensitization processing may be carried out on non-metallic surfaces. ⑶ plating equipment is simple, requires no power and anode, as long as the temperature, pH value and reasonable conditions of process parameters, the part to be plated is immersed in the bath can be. ⑷ chemical plating adhesion and corrosion performance are superior to plating. Certain chemical plating has special physical and chemical properties. ⑸ high hardness, wear resistance, chemical plating nickel layer after heat treatment hardness of Hv1100, tool and die life increased after nickel is generally more than three times. ⑹ strong corrosion resistance, nickel plating in acid, alkali, salt, ammonia and water and other media have good corrosion resistance, corrosion resistance than stainless steel. ⑴ use sodium hypophosphite as a reducing agent electroless nickel plating process is obtained Ni-P alloy, control the phosphorus content of the coating can be amorphous Ni-P plating. Dense coating low porosity, corrosion resistance are superior to nickel plating. ⑵ layer of electroless nickel plated hardness of 450 ~ 600HV, after proper heat treatment, it can reach 1000-1100HV, in some cases, can even replace the use of hard chrome. ⑶ based on the phosphorus content in the coating, the coating can be controlled as a magnetic or nonmagnetic. ⑷ low coefficient of friction coating can achieve oil-free state, lubricity and anti-wear properties are also superior to metal plating. ⑸ phosphorus coating has good weldability.