1) Surface cleaning: Cleaning must be based on the nature of the surface of the rust-preventing material and the conditions at the time. Commonly used are solvent cleaning, chemical cleaning and mechanical cleaning.
2) Dry and clean the surface, dry it with filtered dry compressed air, or dry it with a dryer at 120~170 °C, or dry it with clean gauze.
Method for applying rust preventive oil
1) Immersion method: Some small items are immersed in anti-rust grease, so that the surface is adhered with a layer of anti-rust grease. The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease.
2) Brushing method is used for outdoor construction equipment or special shape products that are not suitable for soaking or spraying. When painting, it is necessary to pay attention not to accumulate, but also to prevent leakage coating.
3) Spray method Some large-scale rust-proof materials cannot be oiled by immersion method. Generally, the filtered compressed air with a pressure of about 0.7Mpa is sprayed in an air-cleaning place. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but it must adopt perfect fire and labor protection measures.
What are the main factors affecting metal corrosion?
Metal corrosion is caused by a variety of internal and external factors, which are summarized as follows:
1 the chemical composition and structure of the metal material itself;
2 metal surface finish (oxygen concentration difference battery corrosion);
3 the composition of the solution in contact with the metal surface and the pH value;
4 ambient temperature and humidity;
5 Various environmental media in contact with the metal surface.
Why does hand sweat cause metal corrosion?
Human sweat is a colorless, transparent or light yellow liquid with a salty, slightly acidic pH with a pH of 5-6. In addition to sodium, potassium, calcium and magnesium salts, it also contains a small amount of organic acids such as urea, lactic acid and citric acid. When the sweat comes into contact with the metal, a sweat film is formed on the metal surface, and the sweat film causes an electrochemical action on the metal to corrode the metal. People sweating is inevitable. To prevent rust from sweating, production personnel should wear gloves, finger cots, or take special parts with tools. Do not touch the product with your hands.
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