A, surface cleaning: cleaning must be based on the nature of the surface of the rust inhibitor and the conditions at that time, and select the appropriate method. Solvent cleaning, chemical cleaning and mechanical cleaning are commonly used.
B, the surface dry clean, can be filtered dry compressed air drying, or drying with 120~170 degrees of drying, also can wipe dry with gauze.
Method of coating antirust oil
A, soaking method: some small items are immersed in rust preventive grease to make the surface adhere to a layer of antirust grease. The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease.
B, brush coating method is not suitable for soaking or spraying outdoor building equipment or special shape products. When brushing, we should not only pay attention to no accumulation, but also prevent leakage.
C, spray method, some large anti-corrosion substances can not be used to soak oil, generally with about 0.7Mpa pressure of filtered compressed air in the air clean place spraying. Spray method is suitable for solvent dilution antirust oil or thin layer antirust oil, but must adopt perfect fire protection and labor protection measures.
Main factors affecting metal corrosion
Metal corrosion is caused by various internal and external factors.
A, the chemical composition and structure of the metal material itself;
B, metal surface finish (oxygen concentration difference battery corrosion);
C, solution composition and pH value in contact with metal surface;
D, ambient temperature and humidity;
E, all kinds of environmental media contacting with metal surface.
Analysis of corrosion causes of stainless steel
Chemical corrosion of 1 Stainless Steel
1.1 surface pollution
The oil, dust, acid, alkali and salt, which are attached to the surface of the workpiece, are converted into corrosive medium in certain conditions, and they react with some components of stainless steel to produce chemical corrosion and rust.
1.2 surface scratches
All kinds of scratches destroy the passivation film and reduce the protection ability of stainless steel. What are the matters needing attention in the installation and use of the self priming pump? It is easy to react with chemical medium, produce chemical corrosion and rust.
After pickling and passivation, washing is not clean, resulting in residual liquid retention, and directly corrodes stainless steel parts (chemical corrosion).
Electrochemical corrosion of 2 stainless steel
2.1 carbon steel pollution
The scratch caused by contact with carbon steel and corrosion medium form electrochemical cell corrosion.
The adhesion and corrosive medium of slag and spatter easily form electrochemical cell.
2.3 roast school
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