What is ISO 22858- Metal and alloy corrosion — Electrochemical tests about?
ISO 22858 specifies a test method for atmospheric corrosion measurements, using two-electrode electrochemical sensors.
ISO 22858 is applicable to measurements of the corrosion rate of uncoupled metal surfaces (i.e., “free” corrosion rate), galvanic corrosion rate, the conductance of thin-film solutions, and barrier properties of organic coatings.
ISO 22858 specifies electrochemical sensors that are used with or without organic coatings. The sensors are applicable to corrosion measurements made in laboratory test chambers, outdoor exposure sites, and service environments.
Who is ISO 22858 - Metal and alloy corrosion — Electrochemical tests for?
ISO 22858 on test method for monitoring atmospheric corrosion is relevant to:
- Alloy and coating manufacturers
- Users in transportation, chemical process, energy, and infrastructure applications
- Corrosion engineers
- Testing authorities
- Electrochemical engineers
Why should you use ISO 22858 - Metal and alloy corrosion — Electrochemical tests?
Corrosion is when a refined metal is naturally converted to a more stable form such as its oxide, hydroxide, or sulfide state, this leads to deterioration of the material.
The purpose of ISO 22858 is to provide instructions on the use of electrochemical sensors for monitoring atmospheric corrosion. These sensors are used to measure thin-film electrolyte conductance, corrosion current, or coating condition over extended periods. This method permits the instantaneous evaluation of corrosion current that can be related to specific environmental conditions in real-time. The instantaneous corrosion current measurements are not accessible using electrical resistance sensors or mass loss techniques. The technology described in ISO 22858 complements other standard techniques for assessing atmospheric corrosion such as mass loss coupons, electrical resistance sensors, or coated test panels. These continuous records of the material condition can be useful for studying atmospheric corrosion, evaluating materials, or managing assets.
Overall, ISO 22858 is useful as it describes the atmospheric corrosion measurements that are made using three types of sensors to measure, which are, free corrosion current, galvanic corrosion current, and surface conductance.