Date: 2013-08-20

Study on the relationship between NSK bearing corrosion and the surrounding humidity

NSK bearing rings and other components when matched with the relative sliding, because of, have a fever caused by friction, heat cracks, such as the case of the external shock load, bearing is easy to fracture. To prevent the relative sliding bearing ring for matching surface damage measures are: choose the appropriate with the amount of interference, to prevent surface sliding and bearing steel material manufactured by infiltration. As with surface inspection bearing, would have found significant sliding scratches. The fracture cracks caused by bearing with the relative sliding surface, the micro crack was in the vicinity (called thermal cracking), such as pickling method to check the bearing has been damaged, on both sides of the material near the crack will be found to have varying degrees of decarburization and burn.
The critical relative humidity of iron at around 65%, aluminum 65%, aluminum 65%, zinc is 701%, so the relative humidity of not more than 60% NSK bearing in the warehouse. As the normal fatigue spalling, should have a plan to replace the bearings, prevent caused by rupture of NSK bearing fatigue spalling. Hot cracks often appearing in the end face and the inner diameter of rolling mill bearing.
NSK bearing fatigue spalling failure move work surface, such as premature appearing before the calculation of bearing life, should consider the actual load bearing is too big, bearing selection is reasonable. The relationship between bearing corrosion in air velocity and relative humidity is not linear relation, the relative humidity is very low when NSK bearing corrosion is very slow, but when the relative humidity increased to a certain value, the corrosion rate was suddenly rise, when the relative humidity value is called the critical humidity.
NSK bearing rust is one of important contents of bearing, storehouse management practice proved, most base bearing corrosion and rust working poor. Such as the atmosphere contains impurities such as coal, sand, dust, will reduce the surface tension of the dew condensation, promote the formation of or thicker water film. When the temperature of the bearing warehouse reduce or increase humidity, atmospheric moisture to form dew condensation surface bearing or bearing packaging materials, the formation of a thin layer of water film (also known as wet film). Many kinds of rust NSK bearings, which generally is the most important is the atmospheric corrosion.

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