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What kinds of material treatments and related characteristics on the surface of the coupling

Publication time: November 2016, 11【L Small

  The high-quality manufacturing of the coupling includes the strength and fatigue strength of the coupling mother body (two halves of the coupling) and the strength and fatigue strength of the coupling parts and elastic elements (metal or non-metal elastic elements), etc.The surface treatment of the coupling is also a problem that cannot be ignored. It is related to the surface corrosion of the coupling and affects the normal use and service life of the coupling.Metal surface treatment generally involves adding a layer of substance to the metal surface to avoid contact with air. Its main advantages are: prevention of rust, corrosion, and beautiful surface.Normally, the surface treatment is mainly anti-corrosion effect, and the surface treatment of the coupling also includes the improvement of the surface hardness. The following describes several coupling surface treatment methods.

  1) Surface painting: It is a simple and widely used surface treatment. Its cost is low, but its surface anti-corrosion and anti-rust performance is poor. It is generally used in large couplings.

  2) Blackening treatment: Blackening treatment is a kind of surface treatment widely used in couplings. It is mainly divided into heating blackening and normal temperature blackening. Among them, the blackened ink is better than the blackened ink at room temperature. The cost of blackening is higher.The cost of heating and blackening is low, but the effect is not good.The principle of blackening at room temperature is to use potion to turn the surface of steel parts into black to improve the quality and prevent rust and corrosion.The material should be steel and iron, alloy parts are not included.

  3) Surface high-frequency treatment (also called induction hardening): It is suitable for high-frequency induction current to quench the surface of the substrate through rapid heating and rapid cooling.Material: The coupling material is steel, especially medium carbon steel, alloy steel, casting and forging products.The quenching thickness should be 0.5 to 5 mm, the operation time is relatively short, and the substrate deformation is relatively small.The same is also widely used in gear couplings.

  4) Nitriding treatment: It is a heat treatment process that uses nitrogen gas and quenching and tempering treatment to effectively improve the overall surface strength of the parts. Its advantages are high surface strength and small overall deformation (about 0.01mm). It is often used in gear couplings. The surface strength of the shaft and the overall strength of the elastic coupling are improved.

  5) Electroplating treatment: Principles and characteristics of electroplating treatment: the female coupling is placed in the electroplating tank and the metal film is deposited on the surface of the substrate in the form of electrolysis through direct current.Material: This method is used for metal or plastic substrates. "Plating the substrate after the surface of the coupling is conductive through pointless resolution", in many cases, some pinholes will be left.For decorative substrates, the surface diameter of the pinholes is 1 micron or less, and for corrosion-resistant or industrial substrates, the diameter of the pinholes is 1 to tens of micrometers.It is often used in occasions requiring high corrosion resistance.

  6) Flame quenching: Use oxygen rapid heating and rapid cooling to quench the surface of the coupling.The material is the same as induction hardening.It is mainly used for quenching the teeth of super large gear couplings.


  8) Degreasing

  The surface degreasing of aluminum and aluminum alloy couplings includes organic solvent degreasing, surfactant degreasing, alkaline solution degreasing, acid solution degreasing, electrolytic degreasing, and emulsifying degreasing.Several degreasing methods and main processes are listed in Table-1.Among these methods, degreasing with alkaline solutions, especially hot sodium hydroxide solutions, is effective.

  9) Alkali etching agent

  Alkali etching agent is the process of surface cleaning of aluminum products in sodium hydroxide solution with or without other substances, and is usually called alkali corrosion or alkaline washing.Its role is to be used as a supplementary treatment after the product has been degreasing by certain degreasing methods to further clean up the oily dirt attached to the surface; to remove the natural oxide film and slight scratches on the surface of the product.So that the product exposes the pure metal matrix, which is beneficial to the formation of the positive film and obtains a higher quality film layer.In addition, by changing the composition, temperature, processing time and other operating conditions of the solution, the etched surface in different states such as smooth or satin matt or gloss can be obtained.The basic composition of the etching solution is sodium hydroxide, in addition to adding regulators (NaF, sodium nitrate), scale inhibitors, (gluconate, enanthate, tartrate, gum arabic, dextrin, etc.), polyvalent Chelating agent (polyphosphate), detergent.

Keywords of this article:Plum coupling | Oldham coupling | Pin coupling |