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Electroplating process for anti-friction layer of sliding bearing
Source: China Bearing Network Time: 2013-03-03
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Electroplating process of anti-friction layer of sliding bearing: If the anti-friction coating is directly electroplated on the fabric metal; the tin in the coating is simply dispersed to the fabric; after the bearing is in operation for a period of time; the tin content in the coating is reduced to less than 6% (quality) And the copper-based alloy fabric is still an aluminum-based alloy fabric; both of which are rich in a certain amount of copper; the tin dispersed in the fabric can form a brittle intermetallic compound (Cu3Sn) with copper. Mechanical properties are degraded; and the layout of the fabric is destroyed; to reduce the overall mechanical properties of the bearing. The method of dealing with this problem is to plate a layer of nickel or nickel-based alloy barrier between the fabric material and the antifriction substrate (also known as the gate layer). Or barrier layer); to disperse according to the tin-tin to the fabric [1~2].
1. The tin or lead-tin alloy protective layer not only has a certain anti-corrosion effect; it can also disperse the amount of tin in the anti-friction layer in the working time of the bearing bush; the content of each component is relatively stable. Because this layer of protective layer contains no copper; it is relatively soft; therefore, the bearing bush can reach the outstanding running-in demand at the beginning of the operation. This paper mainly investigates the plating process of the bearing friction-reducing layer.
2, the process: the anti-friction coating started in foreign countries earlier. In 1920 by Groov (J. Grooff) proposed the first patent for electroplating lead-tin alloy; and for the internal and external appearance of the sailor torpedo gas cylinder Electroplating; to the beginning of the 1940s for the plating of bearing pads. In 1952 Schults proposed a patent for electroplating lead-tin-copper ternary alloys on aluminum and aluminum-silicon (AlSi) alloy substrates. Schoefe has announced the use of lead-tin-copper alloys for bushings. In 1976; Jong SangKim; Su ιι Pyun and Hyo Geun Lee announced the paper "Pore-Orientation and Microscopic Tracing of Lead-tin-copper Electroplating Layers" [7] In 1980, Beebe proposed copper-containing 2~3% (mass) and tin 9~12% (mass); other copper-based ternary alloy electroplating production process; coating thickness was 15μm. 1982 Waterman (Waterman) et al. proposed a treatment method for the replacement of copper ions (Cu2+) in ternary alloy plating bath.
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