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Lubricant Additive Low Heat Resistance
Sep 07, 2017

 lubricant additive Low heat resistance

Simply mention the profile of the lubricant additive.

Extreme pressure agent and anti-wear agent: the two concepts to be completely different is unrealistic, there is no clear between them, and even with the friction modifier together as load additives, extreme pressure extreme pressure and Anti-wear antiwear is more easy to understand some. In boundary lubrication, when the metal surface only to withstand moderate load, if an additive can be adsorbed on the metal surface or with the metal surface of the sharp wear, this additive is called anti-wear additives. When the metal surface to withstand high load, a large number of metal surface direct contact, resulting in a lot of heat, and anti-wear agent film is also destroyed, no longer protect the role of metal surface, if there is an additive with the metal surface Chemical reaction to produce chemical reaction film, from the role of lubrication, to prevent metal surface abrasion, or even welding, usually the most demanding boundary lubrication called extreme pressure lubrication, and this additive is called extreme pressure additives.

Its variety is covered a lot, typically such as sulfur compounds, phosphorus compounds, chlorine compounds and metal compounds. Here to focus on chlorine-containing extreme pressure, including chlorinated paraffin, chlorinated fatty acid esters, cyclic chloride, etc.: chlorine-containing extreme pressure agent in the contact surface with metal metal chloride, such as FeCl2, FeCl3, iron The chemical layer has a layered structure with low critical shear strength and low coefficient of friction, but its low heat resistance and failure at 300 ℃ -400 ℃. Hydrolysis produces HCl and Fe (OH) 2, which loses its lubrication and causes chemical wear And rust. In addition, the chloride is toxic, the use is limited, in addition to metal processing oil is still used, the chloride oil containing oil has been eliminated.

In the vehicle gear oil, CRC L-37 is a low-speed high-torque gear bench test, the tooth surface damage is mainly in the form of surface fatigue pitting and peeling, and to prevent the metal surface fatigue, it is phosphorus The main function. Such as dibutyl phosphite (T304), to prevent the metal surface fatigue is very effective, of course, it is also easy to produce corrosion of the lack of, so how to use the formula T304, is a very artistic thing.

We can think in the material industry, the metal surface of the phosphating treatment, the purpose is to improve the corrosion resistance of the metal. Phosphating film is thin, but because it is a layer of non-metallic non-conductive isolation layer, can make the metal surface of the excellent conductor into a bad conductor, inhibit the formation of metal surface micro-battery, and thus effectively prevent metal corrosion. ② improve the adhesion between the metal matrix and the coating. On the one hand, the phosphating film and the metal workpiece are a tightly integrated structure. On the other hand, the phosphating film has a porosity so that the other coating can penetrate into these pores, and is closely integrated with the phosphating film, The ③ provide a clean surface. The phosphating film can only grow on the surface of the metal surface without rust, so that the phosphated metal workpiece can provide a clean, uniform, rust-free surface. ④ improve the surface friction performance.