To detect the degreasing effect of the surface is actually to detect the degree of hydrophilicity of the surface. In addition to instrumental measurement of the surface wetting angle, which is required for scientific experiments and mechanism research, the detection of the degreasing effect of the surface is basically empirical. method, because it is unrealistic to equip a hydrophilic , and the empirical method is simple and easy to implement, so it is a commonly used method.
One is the observation of surface hydrophilicity, which is to take out the degreased workpiece after immersing it in clean water , and observe the residence state of water on the surface. A fully hydrophilic surface will have an even film of water, and after excess water has run off, the surface remains completely wet. If there is a part where the degreasing is not good, there will be water splashes or oil spots, that is, some basically circular non-wet areas will appear in the water film; Water, the water on the surface will drip quickly after being taken out of the clean water and not wet.
The other is to wipe the degreasing surface with a white clean paper towel, and then check whether there are oil stains on the surface of the paper towel If the degreasing surface is clean, there are only water stains on the paper towel; , there will be traces of oil stains on the paper towels. The extremely thin oil film is transparent and cannot be seen with the naked eye, but after using a paper towel, the oil is collected on the paper towel and is easy to show.
