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ISO 22858:2020 Corrosion of metals and alloys - Electrochemical measurements - Test method for monitoring atmospheric corrosion >
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ISO 22858:2020 Corrosion of metals and alloys - Electrochemical measurements - Test method for monitoring atmospheric corrosion, 2020
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Summary of sensors
- 5 Free corrosion current sensor
- 5.1 Free corrosion current sensor description
- 5.2 Sensor geometry
- 5.3 Uniform corrosion current measurement
- 5.3.1 Use and conditions for uniform corrosion measurements
- 5.3.2 Method 1 — Sine wave excitation
- 5.3.3 Method 2 — Triangle wave excitation
- 5.3.4 Method 3 — Potential step excitation
- 5.4 Localized corrosion current measurement
- 5.5 Free corrosion rate and total free corrosion for sensors without coatings
- 5.5.1 Free corrosion current and current density
- 5.5.2 Free corrosion penetration rate
- 5.5.3 Free corrosion mass loss rate
- 5.5.4 Total free corrosion mass loss and corrosion penetration
- 5.6 Free corrosion current and total charge for sensors with coatings
- 5.6.1 Use and conditions for free corrosion measurements with coatings
- 5.6.2 Free corrosion current for a coated sensor
- 5.6.3 Free corrosion total charge for a coated sensor
- 5.7 Free corrosion sensor preparation
- 5.7.1 Considerations for free corrosion sensor surface preparation
- 5.7.2 Free corrosion sensors without coatings
- 5.7.3 Free corrosion sensors with coatings and surface treatments
- 5.8 Specification and inspection — Free corrosion sensors
- 5.8.1 Visual inspection
- 5.8.2 Sensor range and span
- 5.8.3 Electrical verification tests
- 5.8.4 Corrosion verification tests
- 6 Galvanic corrosion current sensor
- 6.1 Galvanic corrosion current sensor description
- 6.2 Sensor geometry
- 6.3 Galvanic corrosion current measurements
- 6.3.1 Methods for galvanic corrosion current measurement
- 6.3.2 Method 1 — Zero-resistance ammeter
- 6.3.3 Method 2 — Precision resistor
- 6.4 Galvanic corrosion rate and total galvanic corrosion without coatings
- 6.4.1 Galvanic corrosion current
- 6.4.2 Galvanic corrosion rate for mass loss and corrosion penetration
- 6.4.3 Total galvanic corrosion mass loss and corrosion penetration
- 6.5 Galvanic corrosion rate and total galvanic corrosion with coatings
- 6.5.1 Use and conditions for galvanic corrosion measurements with coatings
- 6.5.2 Galvanic mass loss corrosion rate for a coated sensor
- 6.5.3 Total galvanic mass loss for a coated sensor
- 6.6 Galvanic corrosion sensor preparation
- 6.6.1 Considerations for galvanic corrosion sensor preparation
- 6.6.2 Galvanic corrosion sensors without coatings
- 6.6.3 Galvanic corrosion sensors with coatings and surface treatments
- 6.7 Specification and inspection — Galvanic corrosion sensors
- 6.7.1 Visual, span and range inspection
- 6.7.2 Electrical verification tests
- 6.7.3 Corrosion verification tests
- 7 Thin film conductance sensors
- 7.1 Conductance sensor description
- 7.2 Sensor geometry
- 7.3 Surface conductance measurement method
- 7.4 Surface conductance sensor preparation
- 7.5 Specification and inspection — Conductance sensor
- 7.5.1 Visual, span and range inspection
- 7.5.2 Electrical verification tests
- 7.5.3 Conductive solution verification tests
- 8 Coating barrier property sensors
- 8.1 Coating barrier property sensor description
- 8.2 Coating barrier property measurements
- 8.3 Coating barrier property sensor preparation
- 8.3.1 Sensor preparation for coating
- 8.3.2 Coating test condition
- 8.4 Specification and inspection — Coating barrier property sensor
- 8.4.1 Visual, span and range inspection
- 8.4.2 Electrical measurements
- 8.4.3 Sensing system impedance verification tests
- 9 Atmospheric testing with electrochemical sensors
- 9.1 Types of atmospheric tests
- 9.2 Test arrangement
- 9.3 Test duration
- 9.4 Sensor selection
- 9.5 Sampling time interval
- 9.6 Date and time information
- 10 Test report
- 10.1 Test report guidance
- 10.2 Sensor information
- 10.3 Surface preparation
- 10.4 Test description
- 10.5 Sensor inspection
- 10.6 Data storage
- Annex A (informative) Example images of electrochemical sensors
- Annex B (informative) Equivalent circuit analysis for two-electrode measurements
- Annex C (informative) Example of reporting information
- Bibliography [Go to Page]