(1) Indoor environment: Most of the main factors that corrode metals in the air are oxygen. However, important physical corrosion occurs when the air has a certain relative humidity (so-called critical humidity). Generally, the critical humidity is 60% to 70%, and the greater the critical humidity, the greater the corrosion effect.
In the living and working rooms, the relative humidity in summer is high, so the corrosion is greater than in winter. In mountainous and marine areas, indoor relative humidity is mostly higher than flat inland, and corrosion is relatively large. If there is no particularly corrosive component in the air, the amount of corrosion is generally small. Therefore, the corrosive effect will be due to the increase of dust, gaseous impurities in the air, especially sulfur dioxide, acid mist (the production of eight sulfur-containing organic compounds from the combustion gas (eight kitchens in the kitchen and dining room (mainly toilets, woodworking fields), etc. The increase in content is exacerbated.
More severe corrosion may be caused by contact between the part and various objects, such as contact with sweat, wood (organic acids or wetting agents), paper (acids, alkalis, chlorides and sulfides).
(2) Outdoor environment: The situation of corrosion is basically similar to that of indoor environment. The main difference is that most of the outdoor environment will have more impurities and atmospheric dust.
Rainwater, on the one hand, wets the metal, thereby promoting corrosion; on the other hand, it may also accelerate the washing of the corrosive components, thereby reducing the corrosion effect.
The main corrosive factors in the outdoor environment originate from flue gases, which increase the amount of sulfide in the air, especially sulfur dioxide, sulfuric acid and ammonium sulfate. Therefore, atmospheric corrosion is generally greater in industrial areas than in urban areas, while urban areas are larger than rural areas. In the winter, the sulfur content in residential areas is significantly higher than in summer.
(3) Marine climate: On the coast, most have high relative humidity (above 80^) and high salt content, which promotes enhanced corrosion. However, the risk of corrosion is only a few thousand miles along the coast, and there are significant differences in the interior of the area. Corrosion can also be accelerated if the object is directly exposed to fine water mist in the sea area.
In order to overcome the phenomenon of metal corrosion in the production of life, some metal surface treatment methods have been used to prevent metal corrosion - electroplating. Electroplating is a process in which a metal film is adhered to the surface of a metal by electrolysis to prevent corrosion of the metal, and at the same time, the hardness, wear resistance and electrical conductivity of the metal are improved.
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