If in the lining the metal plating coating directly reducing friction, the coating of tin easy to spread the lining, makes bearings in work after period of time, the tin content in coating down to less than 6% (mass). And both copper alloy or aluminum alloy liner liner, which contain a certain amount of copper, spread to the tin with copper liner can generate brittle big intermetallic (Cu3Sn). So not only make the mechanical properties of the coating decline, and destroy the lining structure, to make the whole of the bearings reduce mechanical properties. To solve the problem is in the lining material and reducing friction between the bottom of a nickel plating or nickel-based alloy block layer (also called grid layer or stop layer), to suppress tin to spread the lining [1 ~ 2].
1 tin or lead tin alloy protective layer in addition to have certain corrosion resistant function outside, in bush during the spread of the work can be added in the way of reducing friction the content of zion, make its each ingredient contents in a relatively stable state. In addition, because this layer of protection layer does not contain copper, relatively soft, so in the early years of the job bush can achieve good break-in requirements.
This paper mainly inspects bearings frictional reducing layer electroplating process.
2 development course
Reducing friction in the study abroad coating started relatively early. 1920 years is a lattice ROM Mr Husband (J.G rooff) put forward the lead tin alloy plating the first patent, and ChuQiPing YuHaiJun torpedo the inner surface of the electroplating, by the 1940 s for the electroplating of the bearings. In 1952, schultz (Schults) put forward the aluminum and aluminum silicon (AlSi) alloy substrate electroplating lead tin copper ternary alloy of the patent. 1953 pieces (Schoefe) husband has published axle bush to use lead tin copper alloy were reviewed. In 1976, Jong-SangKim, Su-ι ι Pyun and Hyo-Geun Lee published "" lead tin copper electricity coating the faces orientation and microstructure" paper [7]. 1980 bibby (Beebe) put forward contain copper
2 ~ 3% (mass), tin 9-12% (mass), and the rest of the three yuan for copper alloy plating production process flow, coating thickness of 15 μ m. 1982 wortmann (Waterman), just three yuan alloy plating solution copper ions (Cu2 +) displacement put forward a solution.
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