The information of composite electroless nickel plating

composite electroless nickel plating
Composite electroless nickel plating introduction : The development of one of the fastest in the electroless plating. Salt, bath generally nickel sulfate, nickel acetate the Sub phosphate, sodium borohydride, borane, hydrazine, etc. as a reducing agent, and then add various additives. Operate in the acidic solution or close to room temperature of 90 ° C neutral solution, alkaline solution. Nickel – phosphorus, electroless nickel – boron two categories is divided into different reductant. Coating uniformity, corrosion resistance, hardness, solderability, magnetic, decorative show its superiority.
The characteristics of electroless nickel plating
So far, the development of electroless nickel plating for over 50 years of history. After half a century of research and development, electroless nickel plating has entered a mature stage of development, its present situation can be summarized as follows: the technology is mature, stable performance, versatile, wide range of uses.
Chemical nickel plating deposition of the coating, there are some characteristics different from the electrodeposited layer. ① using sodium hypophosphite as a reducing agent, phosphorus precipitation, the occurrence of the co-deposition of phosphorus and nickel, electroless nickel plating phosphorus was the dispersion state of the nickel-phosphorus alloy coatings, the phosphorus content in the coating of 1% to l5 %, to control the phosphorus content of the nickel phosphorus plating dense, nonporous, corrosion resistance far superior to electroless nickel. Borohydride or amino-borane as a reducing agent, the electroless nickel plating layer is a nickel-boron alloy coating, the boron content of 1% to 7%. Only to hydrazine as the reducing agent to get the coating is a pure nickel layer, the nickel content of 99.5%.
② high hardness, good wear resistance. Only l60 ~ 180HV hardness of the electroless nickel layer, the hardness of the electroless nickel plating layer of 400 ~ 700HV, after appropriate heat treatment can be further increased to close to or exceed the hardness of chromium plating, it is a good wear resistance, the more rare both good corrosion and wear resistance of electroless nickel plating layer.
③ high chemical stability, coating with good adhesion. Higher than the chemical stability of the electroless nickel layer in the atmosphere, as well as in other media, the chemical stability of the electroless nickel plating layer. As usual the bonding of steel, copper and other good binding capacity of not less than the electroless nickel layer and the substrate binding.
④ Because the electroless nickel plating layer containing phosphorus (boron) the amount of the different heat treatment process after plating different physical and chemical properties of the nickel plating layer, such as hardness, corrosion resistance, wear resistance, electromagnetic properties of a variety of changes, other plating rare. Therefore, the electroless nickel plating, industrial applications and process design with the diversity and specific characteristics.
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