Sliding bearing anti-friction layer plating process

If directly on the lining of metal plating antifriction coating, the coating of the tin easily spread to the lining, makes the bearing shell at work after a period of time, plating tin content decreased to less than 6% (in Quality) 。 And copper alloy liner or aluminum alloy liner, which contain a certain amount of copper, spread to the lining of tin and copper can generate brittle intermetallic compounds ( Cu3Sn) 。 Such not only decrease the mechanical properties of the coating, and damage of the lining structure, to reduce the overall mechanical properties of bearing bush. Solution to the problem is at the bottom of lining material and anti-friction between electroplating a layer of nickel or nickel base alloy barrier layer ( Also known as the grid layer or blocking layer) To curb tin lining to spread. 1 tin or lead tin alloy protective layer besides has certain corrosion protection function, can also spread during the period of work in bearing way supplement anti-friction layer of tin content, the content of each component in a relatively stable state. In addition, due to the protective layer does not contain copper, relatively soft, so bearing in the early stages of the work, can meet the requirements of the adaptation of the good. This article mainly inspects anti-friction bearing layer of the plating process. 2 development of anti-friction coating abroad research started relatively early. In 1920 by gro ofu ( J。 Grooff) Lead tin alloy plating is proposed first patent, and the inner surface of the naval torpedo gas bomb plating, in the 1940 s used in bearing shell plating. Schultz (1952 Schults) In aluminum and aluminum silicon ( AlSi) Alloy substrate lead tin copper electroplating ternary alloy of patent. In 1953, ( Schoefe) Has published bearing use lead tin copper alloy were reviewed. In 1976, Jong - SangKim，Su— ιιPyun和Hyo - Geun Lee has published a 'lead tin copper electrodeposit crystal orientation and microstructure of' paper [ 7] 。 Bibby (1980 毕比) 2 ~ 3% copper ( Quality) , tin 9 ~ 12% ( Quality) And the rest of the ternary alloy of copper electroplating production process, coating thickness of 15 microns. Waterman, 1982 ( 沃特曼) And others are ternary alloy of copper ion in plating solution, Cu2+) Permutation problem put forward the solution.