[China Aluminum Network] Application of electroless plating on the surface of metal materials Non-precious metal substrates such as aluminum or steel can be protected by electroless nickel plating technology, and it is possible to avoid the use of difficult-to-machine rust steels to improve their surface properties. The softer, non-abrasive substrate can be given a hard, wear-resistant surface by electroless nickel plating. In many cases, there are many advantages to using electroless nickel instead of hard chrome plating. In particular, plating and post-plating machining are required for internal and complex-plated parts, as well as hard chrome layers. Some substrates use electroless nickel plating to make them easy to braze or to improve their surface properties.
1. Electroless Nickel Plating Electroless nickel plating has extensive physical and chemical properties such as excellent uniformity, hardness, wear resistance and corrosion resistance. This technology has been widely used abroad. The proportion of electroless nickel plating applied in various industries is roughly as follows: aerospace industry: 9%; automotive industry: 5%; computer industry: 15%; food industry: 5%; machinery industry: 15%; nuclear industry: 2% Petrochemical: 10%; plastics industry: 5%; power transmission: 3%; printing industry: 3%; valve manufacturing: 17%; others: 11%.
For example, the electroless nickel plating on the inner surface of the brass tube of the generator set condenser in the power plant can greatly improve the corrosion resistance and prolong the service life of the condensing tube; the nickel alloy plating can improve the hardness and protection performance of the aluminum alloy. Improve the surface properties of aluminum alloys and expand the application of aluminum alloys.
2. Electroless Nickel Plating Alloy (1) Nickel-Phosphorus Binary Alloy Plating: hardness HV550~600, good electrical conductivity, good weldability, corrosion resistance, used for IC top cover, lead frame, molds, buttons, etc.
(2) High-phosphorus nickel alloy coating, non-magnetic, used in a large number of electronic equipment, semiconductor electronic equipment to prevent electromagnetic interference shielding layer.
(3) nickel-boron-phosphorus ternary alloy, plating hardness HV680, for piezoelectric ceramic electrodes, transmissions, valves.
(4) Nickel-BW hardness HV800, electronic molds, contact materials, etc.
(5) Brushed nickel-phosphorus and nickel-cobalt alloys on the 45# steel gear surface can significantly improve the 45# steel gear contact surface.
3. Electroless silver plating is mainly used for soldering of electronic components and printed circuit boards to improve the corrosion resistance and electrical conductivity of products. Also widely used in various decorations, such as assembly cups, advanced travel mugs, fasteners and so on. Beryllium bronze is widely used in the communications industry. In order to further improve the conductivity of beryllium bronze elasticity, silver can be plated on beryllium bronze.
The application of electroless plating on the surface of non-metallic materials Non-conductors Electroless nickel plating of one or more metals may be used, both in terms of decoration and function (eg electromagnetic interference shielding). In many cases, many engineering plastics have been considered as substitutes for metals. Some of them have good high temperature resistance. All of these plastics are lighter than metals and more resistant to corrosion, including polycarbonates, polyaryl ketone ethers, polyetherimide resins, and the like. Where conductive or electrical shielding is required, plastics require metallization and electroless nickel plating can be used for this purpose.
1. Nylon surface is silver plated, copper plated, and nickel plated: If the surface of nylon is electroless nickel, silver, copper is used instead of metal or decoration; a new process of electroless plating is used to plate pure silver on a special nylon base fabric. Nylon cloth has good anti-electromagnetic radiation properties.
2. The surface decoration of plastic workpieces is coated, such as buttons, fasteners on vehicles, protective plates, etc. The use of electroless plating is simple and convenient to meet the needs of the market.
3. The electroless copper plating on polypropylene fiber can be used for chemical filtration and protection in chemical and pharmaceutical textiles, etc. Polypropylene non-woven copper plating composite material increases the conductivity of polypropylene material and can eliminate the hazard of static electricity. It can be used to manufacture antistatic protective clothing. Packaging materials, decorative materials, etc., have a wide range of application prospects.
4. Chemical immersion copper plating: Copper plating with high-strength plastics instead of metallic copper can achieve the same surface properties and effects as copper. It is less difficult than casting and forging processes, and it reduces equipment investment and saves a lot of copper materials. High-strength plastic metal plating can improve the anti-aging properties of plastics and eliminate the electrostatic dust-collecting effect of plastics.