Advantages of stainless steel - resistance to atmospheric corrosion

Experience has shown that the degree of atmospheric corrosion varies by region. For ease of explanation, it is recommended to divide the region into four categories: rural, urban, industrial, and coastal areas.

Rural areas are basically pollution-free areas. The population density in this area is low, with only pollution-free industries.

Cities are typical residential, commercial, and light industrial areas with mild pollution, such as traffic pollution.

Industrial areas are areas where heavy industry causes air pollution. Pollution may be caused by gases formed by fuel, such as sulfur and nitrogen oxides, or other gases released by chemical or processing plants. Suspended particles in the air, such as dust generated during steel production or the deposition of iron oxide, can also increase corrosion.

Coastal areas usually refer to areas within one mile of the seaside. However, the ocean atmosphere can spread deep inland, especially on islands, where prevailing winds come from the ocean and the climate is harsh. For example, the climate conditions in the UK are like this, so the entire country belongs to coastal areas. If the wind is mixed with ocean mist, especially due to evaporation causing salt deposition and accumulation, coupled with less rainfall, the conditions in coastal areas are even more unfavorable. If there is still industrial pollution, the corrosiveness will be even greater.

The research conducted by the United States, the United Kingdom, France, Italy, Sweden, and Australia has determined the impact of these regions on the atmospheric corrosion resistance of various stainless steels. The content is briefly introduced in NiIDI's "Architect's Guide", which includes tables that can help designers choose the most cost-effective stainless steel for various areas.

When making a selection, it is important to determine whether there are any local factors that may affect the usage site environment. For example, stainless steel used below factory chimneys, near air conditioning exhaust baffles, or near scrap yards may have extraordinary conditions.

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