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Manufacturing Technology Insights | Tuesday, September 01, 2020
Metal is an integral part of many industries and with metal comes corrosion. Thus, industries must take preventive measures to curb metal corrosion.
Fremont, CA: Corrosion of metal is its deterioration process caused by environmental interactions. The corrosion process requires three factors, such as moisture, a metallic surface, and an oxidizing agent known as an electron acceptor. The corrosion process changes the reactive metal surface, namely its oxide, hydroxide, or sulfide, into a more stable form. Every metal is prone to corrosion. However, it is possible to slow, manage, or stop corrosion before it creates a problem. To prevent corrosion in metal, engineers can encompass corrosion control in the design process. While manufacturing, a protective corrosion barrier can be applied, and the users can take measures to prolong the metal's life. The preventive measures can be used from the design to the finishing and maintenance part. Here are a few ways of preventive measures.
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Design
Manufacturers must think of the environment where the part is going to be used and should design the piece with that in mind. For instance, instead of collecting water and debris on the surface, the parts exposed should allow it to drain. Designers must eliminate narrow gaps that allow air or fluid to enter and become stagnant to reduce crevice metal corrosion. In saltwater environments, engineers must allow some degree of corrosion.
Environmental Control
Environmental factors are a major factor that impacts corrosion. If the metal has to be stored for a long time, the level of sulfur, chloride, and oxygen in the surrounding environment must be considered. Galvanic corrosion happens when metals with two separate electrode potentials come in contact with each other with an electrolyte like saltwater. The metal with higher electrode activity corrodes at the point of contact. One of the simple ways to prevent galvanic metal corrosion is to store them separately.
Protective Coating
Coatings act as a physical barrier between metal parts and oxidizing elements in the environments. One of the most common methods is galvanization, where the manufacturers use a thin layer of zinc to coat the metal part. One of the other effective ways to prevent corrosion is powder coating. With the proper application of powder coating, it can completely seal away the part from the environment.
For offshore/onshore, oil and gas, power generation, and more such industries, corrosion protection is paramount as a slight hiccup can cost them millions of dollars in maintenance and equipment replacements.
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