Surface pretreatment method of rusty objects;
1, surface cleaning: cleaning must be based on the nature of the surface of the object to be rusted and the conditions at that time, choose the appropriate method. Generally, there are solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method.
2. After the surface is dry and clean, it can be dried with filtered dry compressed air, or with a dryer at 120~ 170℃, or with clean gauze.
Method of applying antirust oil:
1. soaking method: soak some small objects in antirust grease to make their surfaces adhere to a layer of antirust grease. The thickness of oil film can be achieved by controlling the temperature or viscosity of antirust grease.
2. Brush coating method is used for outdoor building equipment or products with special shapes that are not suitable for soaking or spraying. When brushing, we should not only pay attention to avoid accumulation, but also pay attention to prevent leakage.
3. Spraying method Some large rust-proof objects cannot be oiled by dipping method. Generally, compressed air with a filtered pressure of about 0.7Mpa is sprayed in a clean place. Spraying method is suitable for solvent dilution of antirust oil or thin-layer antirust oil, but perfect fire prevention and labor protection measures must be taken.
Extended data
Metal corrosion is caused by various internal and external factors, which can be summarized as follows:
1, the chemical composition and structure of the metal material itself;
2. Poor metal surface finish (oxygen concentration battery corrosion);
3. Composition and pH value of the solution in contact with the metal surface;
4. Ambient temperature and humidity;
5. Various environmental media in contact with the metal surface.
Baidu encyclopedia-rust prevention