Corrosion is a natural process which is caused by the transformation of iron from its natural state to steel. Steel is fundamentally an unstable state of iron and corrosion is the process of iron returning to its natural state. The driving force of corrosion in this product is the energy used during the refining process.
The kind of corrosion that develops in metal products is based on how a part is used and the conditions it is exposed to. Below is an overview of the usual types of corrosion:
Galvanic corrosion – This is the most common type of corrosion and occurs when two metals with different electrochemical charges are linked through a conductive path. Galvanic corrosion occurs when metal ions move from the anodized metal to the cathodic metal. It can also come up when one impure metal is present. If a metal contains a combination of alloys that has different charges, one of the metals can become corroded. The anodized metal, which is the weaker, less resistant one, loses ions to the stronger, positively charged cathodic metal and thus corrosion happens.
General corrosion – This type of corrosion happens as a result of rust. If metal, particularly steel, is exposed to water, the surface becomes oxidized and a thin layer of rust appears. Like galvanic corrosion, general corrosion is also electrochemical. In order to prevent oxidation, a preventative coating must interfere with the reaction.
Stress-corrosion cracking or SCC – A metal product or component can experience SCC along the grain boundary subjected to extreme tensile stress. Because of this, cracks can form, which are the usual targets of corrosion. SCC is usually caused by stress from cold work, welding, and thermal treatment.
Info source: cortec-me.com
The kind of corrosion that develops in metal products is based on how a part is used and the conditions it is exposed to. Below is an overview of the usual types of corrosion:
Galvanic corrosion – This is the most common type of corrosion and occurs when two metals with different electrochemical charges are linked through a conductive path. Galvanic corrosion occurs when metal ions move from the anodized metal to the cathodic metal. It can also come up when one impure metal is present. If a metal contains a combination of alloys that has different charges, one of the metals can become corroded. The anodized metal, which is the weaker, less resistant one, loses ions to the stronger, positively charged cathodic metal and thus corrosion happens.
General corrosion – This type of corrosion happens as a result of rust. If metal, particularly steel, is exposed to water, the surface becomes oxidized and a thin layer of rust appears. Like galvanic corrosion, general corrosion is also electrochemical. In order to prevent oxidation, a preventative coating must interfere with the reaction.
Stress-corrosion cracking or SCC – A metal product or component can experience SCC along the grain boundary subjected to extreme tensile stress. Because of this, cracks can form, which are the usual targets of corrosion. SCC is usually caused by stress from cold work, welding, and thermal treatment.
Info source: cortec-me.com
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