NACE Study Guide 2026

Sand/erosion probes detect metal loss caused by mechanical abrasion from entrained sand, proppants, or other solids, which is a distinct failure mechanism from electrochemical corrosion.

The primary advantage of conventional air spray is its ability to provide finer atomization, which results in a higher quality, smoother finish. It also allows the operator more control over both the fluid flow and atomizing air pressure, making it ideal for smaller, more complex objects or when a high-quality aesthetic finish is paramount.

EN monitoring captures natural, low-level fluctuations in electrochemical potential and current that serve as fingerprints for corrosion mechanisms including pitting and stress corrosion cracking.

Online monitoring enables continuous, real-time data collection while the system remains in service, allowing early detection of corrosion upsets and trend analysis without production interruption.

Microbiologically Influenced Corrosion (MIC) is primarily caused by the metabolic activities of microorganisms on material surfaces. These microbes can produce corrosive byproducts like acids or sulfides, create differential aeration cells, or alter the local chemistry, all of which accelerate the degradation of the material. MIC can lead to severe localized corrosion, such as pitting.

Hydrogen probes detect atomic hydrogen permeating through metal walls, which is a key indicator of hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) susceptibility.