Nickel-based alloy refers to the 650 ~ 1000 ℃ high temperature with high strength and certain oxidation corrosion resistance and so on comprehensive performance of the alloy. It can be divided into nickel-based heat-resistant alloy, nickel-based corrosion resistant alloy, nickel-based wear-resistant alloy, nickel-based precision alloy and nickel-based shape memory alloy according to its main properties. Nickel base alloy products mainly include: electric stove, electric iron, turbine engine turbine disc, combustion chamber and turbine blades, color TV, communications equipment, the pendulum clock and measuring tape, manufacturing furniture, have the fine tools, the performance of permanent magnet used on spacecraft automatic open structure, since the motivation of aerospace industrial fasteners and biomedical use artificial heart motor, etc. It is widely used in aviation, shipbuilding, chemical industry, electronics, medicine, energy and other industrial fields.
Nickel plating refers to the coating of steel and other metal substrates with a durable and corrosion resistant coating. Its corrosion resistance is 20% ~ 25% higher than that of galvanized coating. Nickel - plated articles beautiful, clean, and not easy to rust. The processing amount of nickel plating is second only to electrogalvanizing, and its consumption accounts for about 10% of the total nickel production. Nickel plating is divided into electroplating nickel and electroless nickel plating. The characteristics of electroless nickel plating and electroless nickel plating are analyzed as follows.
Nickel electroplating layer in the air stability is very high, crystal is very small, and has excellent polishing performance, coating hardness is relatively high can improve the wear resistance of the surface of products, widely used in optical instrument coating, protective decorative coating, casting mold electronic components.
Electroless nickel plating thickness uniformity, no hydrogen percolation, no hydrogen brittleness, electroless nickel plating does not need to remove hydrogen. Many chemical nickel plating products of corrosion resistance and high temperature oxidation resistance is better than electroplating nickel, can be deposited on the surface of various materials, don't need dc motor or control equipment for the general plating, heat treatment temperature low just under 400 ℃ after different heat preservation time, different corrosion resistance and abrasion resistance, can be obtained as a result, it is especially applicable to complicated shape, surface wear and corrosion resistant parts of functional coatings, etc.
