According to NACE International, the global cost of corrosion is estimated to be US$2.5 trillion. However, that can be mitigated by using appropriate corrosion-resistant coatings and ensuring the surface is prepared correctly.
NACE International estimates that savings between 15 and 35 percent can be realized when applying the correct methods to prevent corrosion. In addition, a NACE-certified coating inspector can identify the best coatings and applications to help prevent unnecessary economic impacts.
NACE International has identified ten types of corrosion that, depending on several factors, can simultaneously attack a structure or component, causing it to corrode and impacting your bottom line. These factors include the coating, environment, and material.
Most corrosion types, like uniform attacks, result when a material experiences a chemical or electrochemical reaction with its environment. The most common material impacted by this naturally occurring issue is metal.
Here are a few of the most common types of corrosion.
Uniform Attack Corrosion
Also known as general overall corrosion, uniform attack is readily identifiable by ordinary visual examination, with a group one classification. It is also the most common type of corrosion caused by either a chemical or electrochemical reaction, resulting in the equipment’s progressive deterioration and ultimate failure. Uniform attack corrosion, like other types, can be prevented by using a corrosion-resistant coating.
Pitting
A form of localized corrosion, pitting leads to small holes in the metal, although more significant gaps can occur. Regardless of the cavity’s diameter, it can either be isolated or numerous. It is considered the most destructive form of corrosion due to its characteristic small holes being challenging to detect. Over time, pitting will cause the equipment to deteriorate, ultimately leading to failure.
Crevice Corrosion
Another form of localized corrosion, also classified in group one, is crevice corrosion. This form is usually associated with a stagnant micro-environment such as those under gaskets, washers, fastener heads, etc. It is typically initiated by chemical changes within the crevice, including depletion of oxygen or an inhibitor, a shift in acid conditions, or a build-up of aggressive ion species.
NACE-Certified Coating Inspector
RFI Consultants is an Arizona-based, veteran-owned small business operating as an independent NACE-certified coating inspection and consulting company.
Our company exists to provide coating inspections to minimize the risk of premature or catastrophic coating failures. These coverings must be applied to commercial and industrial surfaces under the correct specification, conditions, and manufacturer’s guidelines. Some of the industrial markets we serve include:
- Pipelines
- Infrastructure
- Sports stadiums
- Parking structures
- Commercial buildings
- Manufacturing plants
- Food and beverage plants
- Wastewater treatment facilities
To learn more about our coating inspection and consulting services, or for more information on our coatings-related educational courses, please contact us at (480) 560-7182. Schedule an appointment with a NACE-certified coating inspector today!
Resources:
“Corrosion Basics.” NACE International.
“Crevice Corrosion.” NACE International.
Fontana & Greene. “Eight Forms of Corrosion.” NACE International.
“Economic Impact: Assessment of the Global Cost of Corrosion.” NACE International.
“Pitting.” NACE International.
“Uniform Corrosion.” NACE International.
