Precision parts usually need to keep their surfaces smooth and free of rust to ensure their function and performance.The following are some common methods for removing rust from precision parts:　　1.Mechanical descaling:Mechanical descaling is the removal of rust and corrosion from the surface of precision parts by physical force.Commonly used mechanical descaling methods include scraping,grinding and polishing.Scraping rust and corrosion can use tools such as scrapers and brushes;sanding can use sandpaper and grinding wheels,etc.;and polishing can use polishing tin and polishing cloth.　　2.Chemical descaling:Chemical descaling is to remove the rust and corrosion on the surface of precision parts through chemical reaction.Commonly used chemical descaling methods include acid washing,alkali washing and electrolytic descaling.Acid washing commonly used acid solution has sulfuric acid,hydrochloric acid,etc.,can dissolve the corrosion;alkali washing is the use of strong alkali solution,such as sodium hydroxide or potassium hydroxide to neutralize the acidic substances;electrolytic descaling is through the electrolysis reaction to the surface of the corrosion of the material is converted into harmless substances.　　3.Magnetic descaling:Magnetic descaling removes surface corrosion through the action of magnetic field.Magnetic descaling method usually uses electromagnet or permanent magnet as the source of magnetic field,placing the precision parts in the magnetic field,the corrosion will be attracted by the magnetic force and removed.　　4.Coating descaling agent:Coating descaling agent is a specific descaling agent coated on the surface of precision parts to remove corrosion through its chemical composition and surface reaction.Common coating descaling agents include descaling spray,descaling oil,etc.5.　　5.Water vapor descaling:Water vapor descaling is a method of using high temperature and high humidity water vapor to clean the surface.Precision parts will be placed in a high temperature and high humidity environment,the water vapor will soften and dissolve the corrosion,and then use gas blowing or water rinsing to remove the corrosion.

　　Regardless of which rust removal method is used,the following points need to be noted:　　-Choose a suitable descaling method,according to the specific rust condition,material and process requirements.　　-Pay attention to safety,especially when using chemical descaling methods,wear appropriate personal protective equipment,such as gloves,glasses and protective clothing.　　-Appropriate descaling agents,process parameters and operation methods should be selected according to the material and surface treatment requirements of the parts,and proper maintenance and repair should be carried out to ensure the descaling effect and quality of the parts.　　The above are some commonly used methods for descaling precision parts,the specific use of which method still need to be evaluated and selected according to the actual situation.