{"id":4261,"date":"2023-11-08T02:06:30","date_gmt":"2023-11-08T02:06:30","guid":{"rendered":"https:\/\/nanotechvietnam.com\/factors-causing-corrosion-on-materials\/"},"modified":"2023-11-08T02:06:30","modified_gmt":"2023-11-08T02:06:30","slug":"factors-causing-corrosion-on-materials","status":"publish","type":"post","link":"https:\/\/nanotechvietnam.com\/en\/factors-causing-corrosion-on-materials\/","title":{"rendered":"FACTORS CAUSING CORROSION ON MATERIALS"},"content":{"rendered":"

Corrosion<\/b><\/a> is the gradual destruction of materials (usually metals<\/a>) through a chemical<\/a> or electrochemical reaction with the environment<\/a>.<\/p>\n

In its most common sense, corrosion means the electrochemical oxidation<\/a> of metals in reaction with oxidizing agents<\/a> such as oxygen<\/a> or sulfate salts. Rust<\/a> \u2013 the formation of iron oxides \u2013 is a well-known example of galvanic corrosion. Corrosion can also occur in non-metallic materials, such as ceramics<\/a> or polymers<\/a>, but the process is often called “decomposition” or “material deterioration” (instead of corrosion). . Corrosion reduces the useful properties of materials and structures including durability, appearance, and permeability to liquids<\/a>\/gases.<\/a>.<\/p>\n

Many alloys<\/a> corrode simply when exposed to moisture in the air<\/a>, but the process can be accelerated by exposure to certain substances. Corrosion can occur locally, forming holes or cracks, or it can occur over a larger surface. Because corrosion is a diffusive dynamic process, it occurs on the contact surface. Therefore, methods that reduce the reactivity of the contact surface, such as passivation<\/a> and chromatization, can increase the corrosion resistance of the material. However, some corrosion mechanisms are more difficult to recognize and predict than usual.<\/p>\n

Corrosion is a process with a complex mechanism, but basically, corrosion can be understood as an oxidation-reduction phenomenon. At a point on the metal surface, oxidation occurs, the metal atom loses electrons, called oxidation. That oxidized site becomes the anode (anode). Electrons will move from the anode to another location on the metal surface, increasing the number of electrons (reduction process). The position with increased electrons becomes the cathode (cathode).<\/p>\n

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