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Application of Anti-Seize Compound

9/17/2013 10:29:08 AM | by Anonymous

Anti-Seize Compounds

Anti-seize compound is used for the threads of fasteners in some applications. The purpose of the compound is depend upon the application and it can prevent galling of mating surfaces in such that compounds are frequently used with stainless steel fasteners to prevent this effect from occurring. In applications, they are used to improve the corrosion resistance to allow the parts to be subsequently disassembled. And thirdly, this can provide a barrier to water penetration since the threads are sealed by the use of compound.

These anti-seize compounds are used on screws and bolts to prevent galling. When galling occurs at a microscopic level, the local high spots between the two rubs will and weld together. If attempts to move the parts cause of these microscopic welds to tear, it will further roughening the surfaces of the parts and increase the roughing surfaces that continue to weld together in more and locations until the two parts are frozen together. The galling commonly occurs when the parts are of identical materials such as stainless steel bolts and nuts.

The anti-seize compounds act as a lubricant and it also lubricates the parts whereby it is between the inserted sections of tubing to ease assembly and disassembly. This is to prevent the formation of a non-conductive oxide layer on the freshly cleaned metal that includes copper and aluminum. This application base is grease like that prevents the oxygen in the air from reaching into the clean metal surface. This application is very important for cable connections and antennas especially those that used to carry receive level signals whose voltages are too low to punch through the oxide layers.

It also will reduce the galvanic corrosion in a joint of dissimilar metals. This application of the anti-seize compound will actually prevent the water from penetrating into the joint. An example: the anti-seize is used between the stainless steel flat washer or stainless steel bolt head and an aluminum plate. This is to increase the conductivity between the two parts of a joint under pressure. For this application, it requires small aluminum or copper particles in the grease like base that should be included in the anti-seize compound and when the joint in tightened these particles bridge will remain in the microscopic gaps between the parts.


What is Grease (lubricant)?

It is basically a semisolid lubricant that consists of a soap emulsified with mineral or vegetable oil. The feature of greases is that it possesses a high initial viscosity upon the application of shear that drops to give the effect of an oil-lubricant bearing of approximately the same viscosity as the base oil is used in the grease. Sometimes it can also be used to lubricate materials that are of soft solids or that have high viscosity liquids however these materials does not exhibit the shear-thinning properties of the classical grease. In addition, grease lubricated bearings has greater frictional features due to its high viscosity.

An excellent anti-seize compound for earth connections and antenna work should contains water resistant carrier that lubricates the parts as well as a petroleum based and it also can resist water penetration yet it is sticky enough to stay in place. This includes microscopic aluminum and copper particles for conductivity under pressure. It can also be applied over a temperature range of -29C to +232C.

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