Corrosion Part 2

Corrosion Part 2

If you want to know about corrosion, you will surely be interested in our first part of the article.

Flow Assisted Corrosion (FAC):

Flow-assisted corrosion, or flow-accelerated corrosion, occurs when a protective layer of oxide on a metal surface is dissolved or removed by wind or water, exposing the underlying metal to further corrosion and deterioration.

  • Erosion-assisted corrosion
  • Infringement
  • Cavitation

Intergranular corrosion:

Intergranular corrosion is a chemical or electrochemical attack on the grain boundaries of a metal. It often occurs due to impurities in the metal, which tend to be present at higher contents near grain boundaries. These boundaries may be more vulnerable to corrosion than most metal.

Desalloyment:

Dealloying, or selective leaching, is the selective corrosion of a specific element in an alloy. The most common type of alloy removal is the removal of zinc from unstabilized metal. The result of corrosion in such cases is deteriorated and porous copper.

Fretting corrosion:

Friction corrosion occurs as a result of repeated wear, weight and/or vibration on an irregular and rough surface. Corrosion, resulting in pits and grooves, occurs on the surface. Friction corrosion is often found on rotating and impact machinery, bolted assemblies and bearings, as well as on surfaces exposed to vibration during transport.

High temperature corrosion:

Fuels used in gas turbines, diesel engines and other machinery that contain vanadium or sulfates can, during combustion, form compounds with a low melting point. These compounds are very corrosive to metal alloys normally resistant to high temperatures and corrosion, including stainless steel.

High temperature corrosion can also be caused by high temperature oxidation, sulfidation and carbonization.

Consequences of corrosion

The World Corrosion Organization estimates that the global cost of corrosion is approximately US$2.5 trillion annually, and that a large portion of this, up to 25%, could be eliminated by applying simple, well-understood prevention techniques. However, corrosion prevention should not only be considered a financial issue, but also a health and safety issue. Corroded bridges, buildings, ships and other metal structures can cause injury and death.

Prevention

An effective prevention system begins at the planting and design stage; it is necessary to know the environmental conditions where the installation will be made and the properties of the required material. At SIESA we distinguish ourselves by being experts in corrosion problems. When handling materials that withstand extreme corrosive environments and are resistant to high concentration chemicals, corrosion is a serious problem and should not be taken lightly.

We handle different solutions for different needs and types of facilities, get advice from one of our experts and start living with fewer worries about the safety and quality of your facilities.

Sources:

https://www.thebalance.com/galvanic-corrosion-2339698

https://www.thebalance.com/corrosion-rate-calculator-2339697


Search
Other publications
Categories