Metal is one of the most popular and widely used materials in industry, construction and other areas. It is durable, long-lasting and versatile, however, despite all its advantages, metal is subject to various factors that can lead to its degradation. One of the most dangerous and common phenomena is raid And rust, which can significantly weaken the design and performance characteristics of metal products.
ᗎ In this article, we'll look at what scale and rust are, how they form, the threats they pose to metal, and how to prevent and combat these problems.
What is plaque and rust on metal?
Plaque on metal
Raid — is a thin film that forms on the surface of a metal as a result of chemical reactions, exposure to moisture, dirt, dust or aggressive chemicals. The film can vary in composition: from a light film from water to more persistent and harmful deposits containing salts, acids or alkalis.
Reasons for the appearance of plaque:
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Water getting on the metal surface (especially after rain or in high humidity conditions).
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Air pollution from dust and chemicals.
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Improper storage of metal, especially in conditions of high humidity.
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Use of metals with insufficient protection from external factors.
The deposit itself does not always cause serious damage to the metal, but its long-term presence can contribute to the development of more serious problems such as corrosion.
Rust on metal
Rust — is a product of a chemical reaction between metal, oxygen and moisture. Rust usually appears on iron and its alloys, such as steel, and is the result of the oxidation process of iron. As a result of the chemical reaction, iron combines with oxygen, forming iron hydroxide, which later turns into rust — a reddish-brown coating on the surface of the metal.
The process of rust formation:
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Metal corrosion begins with the appearance of microscopic damage or defects on its surface.
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Moisture (including from the air) penetrates these microcracks and begins to react with oxygen, forming iron hydroxide.
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Over time, iron hydroxide oxidizes and turns into rust, a long process that can severely damage the metal's structure.
Causes of rust:
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Exposure to moisture and oxygen (water, rain, high humidity).
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Uncleaned surfaces after production or storage.
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The presence of contaminants (such as salt or acid) that accelerate the oxidation process.
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The presence of metal in aggressive environments (for example, sea water).
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Poor quality of coating or lack of protective layers on the surface.
Rust is a much more serious threat than plaque, as it actively destroys the structure of the metal, reducing its strength and durability.
The dangers of plaque and rust on metal
1. Reduction in metal strength
Rust and scale can significantly weaken metal, especially if they are exposed to it for a long time. Rust, penetrating deep into the material, destroys its structure, which leads to loss of strength. This is especially dangerous for structures that are subject to high loads, such as in construction, transport and shipbuilding. The metal becomes more brittle and can easily break or deform.
2. Reduced durability
Metal products that are exposed to rust for a long time lose their functionality and may require frequent repairs or replacement. This directly affects durability structures, increasing operating and maintenance costs. For example, metal pipes covered in rust may leak, and metal parts affected by corrosion may lose their shape.
3. Deformation and aesthetic damage
In addition to strength and durability, rust also affects the appearance of products. Deformation metal and corrosion stains make the surface unsightly and unsuitable for use in some areas, such as architecture, automotive manufacturing or home furnishings.
4. Damage to the coating and protective layers
Rust not only destroys the metal itself, but can also damage its protective coatings (such as paint or anti-corrosion coating). When the coating is damaged, the metal becomes more susceptible to further oxidation, and the corrosion process accelerates. This creates cyclical problem, where each damage to the coating leads to accelerated destruction of the material.
Methods for preventing and combating plaque and rust
1. Protection with coating
Coatings — is one of the most effective methods of protecting metal from plaque and rust. Use painting materials, anti-corrosion agents or stainless alloy coatings prevents metal from coming into contact with moisture and oxygen, thereby slowing down or completely preventing the formation of rust.
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Galvanizing (galvanization) is the process of coating metal with a layer of zinc, which protects it from corrosion.
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Paint coatings - This is also an effective method of protection, but they require regular updating.
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Alluvial coatings - use of special liquids or films that prevent the appearance of rust.
2. Chemical protection
Usage chemical corrosion inhibitors may slow down or prevent the formation of rust. These substances can be added to environments in which the metal is used or applied to the surface of metal products in liquid form.
3. Proper storage and care
To prevent plaque and rust, it is essential to store metal products correctly, avoiding exposure to moisture and aggressive chemicals. This is especially important for metals such as steel, copper, brass and others that are sensitive to corrosion. Metal products should be stored in dry rooms, and if they are used in high humidity conditions, their condition should be checked regularly.
4. Regular cleaning and maintenance of metal
Regular cleaning of metal surfaces from dirt and deposits, as well as timely diagnostics of possible damage and defects, will help prevent the formation of rust. The use of specialized cleaning agents for metal allows you to effectively remove dirt and deposits without damaging the protective layer.
5. Use of stainless metals
For some products, especially those that are exposed to aggressive external factors (such as sea water), it is reasonable to use stainless alloysThese materials are highly resistant to corrosion and their use significantly reduces the risk of rust.
Conclusion
Metal tarnish and rust are not only an aesthetic problem, but also a serious threat to the strength, durability, and functionality of metal structures. To avoid these problems, it is important to follow preventive measures, including coating protection, regular maintenance, and proper storage of metals. Careful maintenance and timely actions to protect metal will help keep it in good condition and prevent destruction caused by exposure to moisture and oxygen.
