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Rust-Resistant Categories and Their Characteristics
Release date:
2016/06/21
To effectively prevent rusting of metal parts and equipment, current anti-rust methods can be broadly categorized into four main types:
1. Altering the corrosion resistance of metals by modifying their internal microstructure.
This method takes into account the metal material itself, altering its internal microstructure to produce alloy steels, stainless steels, and other similar materials. Typically, during steelmaking, alloying elements such as silicon, manganese, chromium, vanadium, titanium, boron, tungsten, molybdenum, or rare earth elements are added, enabling iron to bond with these elements and enhancing its corrosion resistance.
2. Surface conversion coatings and “permanent” surface coatings for metals
This method can be categorized as follows:
1. Chemical and electrochemical conversion coatings, such as oxidation, phosphatization, chromate conversion, fluorination, etc.;
2. Surface alloying, including nitriding and metal diffusion treatments (e.g., chromium diffusion, aluminum diffusion, nitrogen diffusion, etc.);
3. Metallic coatings, such as electroplating, thermal spraying, chemical plating, vapor-phase plating, and melt plating;
4. Non-metallic coatings, including inorganic coatings like enamel and ceramic coatings, and organic coatings such as paints, plastics, and rubber coatings.
3. Cathodic Protection
Even if the metal surface becomes the cathode—for example, in seawater, a magnesium block can be used as the anode and connected to a steel plate, thereby turning the steel plate into a cathode and providing corrosion protection. Similarly, underground pipelines and chemical equipment can also be protected by attaching an additional electrode externally and passing an electric current through it.
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