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Analysis of Electroplating Process of Anti-friction Layer of Sliding Bearing

Source: Bearing network time: 2013-02-09

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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 operation 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 friction coating in foreign countries began to study 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 water soldier 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 Î¹Î¹PyunandHyo GeunLee announced the paper "Pore-Orientation and Microscopic Tracing of Lead-Silver-Copper Coatings" [7]. 1980 Beebe proposed copper-containing 2~3% (mass), tin 9~12% (mass); other copper-based ternary alloy electroplating production process; coating thickness is 15Î¼m. 1982 Waterman, etc. 2. The method of treatment of copper ion ( Cu 2+ ) in the ternary alloy plating solution was proposed.

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