Key Rules to Help Prevent Corrosion

Key Rules to Help Prevent Corrosion

Manufacturing Technology Insights | Friday, December 31, 2021

While the material selection is the most important factor in preventing corrosion, designers and engineers must not overlook the importance of correct design.

Fremont, CA: The right design is just as crucial as the right materials to prevent corrosion. The weakest link in corrosion control in many constructions is a lack of design consideration. Designers should be able to identify the mechanical qualities and strength necessary to assure a structure's corrosion resistance. It is more cost-effective to design structures and parts to avoid corrosion rather than wait for equipment to fail in service. Close collaboration between designers and corrosion experts can be quite useful, and it should be assured in applications where corrosion is a concern.

Here are a few crucial design principles to keep in mind to prevent corrosion:

Adjusting wall thickness

Because corrosion involves the breakdown of materials, it consumes the substance and reduces its thickness over time. As a result, incorporating allowances to reduce the thickness of pipelines, storage tanks, and other sections is a part of the corrosion-resistant design. A typical rule is to make the wall thickness twice as thick as is required for the structure's desired life. However, the wall thickness must meet mechanical stress, pressure, and weight criteria.

Make sure there's enough drainage

Tanks and other storage containers should be designed such that they can be drained and cleaned quickly. As a result, all transitions should be seamless, and taps should be strategically placed to allow the tank to be completely empty.

Differential Aeration Cells Should Be Avoided

Differential aeration should be avoided whenever possible. Aeration should be sufficient for components immersed in water to promote passivation, which reduces corrosion. Otherwise, aeration should be avoided to the greatest extent possible. Similarly, easy drainage and an abundant supply of air should be guaranteed for structures that are exposed to the atmosphere, and porous surfaces or structures with cavities should be appropriately sealed.

Temperature gradients should be kept to a minimum

Heat transport equipment should be constructed to have as low variation in surface temperature as practicable. It's best to stay away from cold and hot regions. Thermogalvanic corrosion is prone to superheated regions, while cold patches can increase local condensation, which leads to corrosion. As a result, the thermal gradient should be kept as low as possible.

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