1)Surface cleaning: cleaning must be based on the nature of the surface of the rust-proof material and the conditions at the time, the appropriate method selected. Generally used solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method.
2) surface drying after cleaning can be filtered dry compressed air blow-dry, or 120 ~ 170 ℃ dryer for drying, can also be used to clean gauze dry.
Methods of applying antirust oil:
1) Immersion method: Some small items are immersed in antirust grease, so that a layer of antirust grease adheres to its surface. The thickness of the film can be achieved by controlling the temperature or viscosity of the antirust grease.
2) Brushing method is used for outdoor construction equipment or special shaped products that are not suitable for immersion or spraying, and attention should be paid to both not generating buildup and preventing leakage when brushing.
3) Spray method, some large-scale antirust products can not be coated with oil by immersion method, and generally use filtered compressed air at a pressure of about 0.7Mpa in the air clean place for spraying. Spray method is suitable for solvent-diluted antirust oil or thin layer antirust oil, but must be used to improve the fire and labor protection measures.
What are the main factors affecting metal corrosion?
Metal corrosion is caused by a variety of intrinsic and extrinsic factors, summarized as follows:
①Chemical composition and structure of the metal material itself;
②Metal surface finish (oxygen concentration of differential cell corrosion);
③Composition of the solution in contact with the surface of the metal and the value of pH;
④Environmental temperature and humidity;
⑤With the metal surface, the metal surface is corroded by the corrosion-resistant metal.
⑤A variety of environmental media in contact with the metal surface.
Why does sweaty hands cause metal corrosion?
Human sweat is a colorless, transparent or yellowish liquid with a salty taste and weak acidity, and its pH value is 5 ~ 6. In addition to sodium, potassium, calcium, magnesium salts, but also contains a small amount of urea, lactic acid, citric acid and other organic acids. When sweat and metal contact, will form a layer of sweat film on the surface of the metal, sweat film will cause electrochemical effects on the metal, corrosion of metal. People sweat is unavoidable, to prevent hand sweat caused by corrosion, production personnel should bring gloves, finger cots, or use a special tool to pick up the parts, do not casually touch the product with their hands.