What are the corrosion potential and corrosion-current indicators?
Potentiodynamic polarisation
Performance Testing · Electrical & Electrochemical
Electrochemical Corrosion Testing
Quantify corrosion tendency and protection using open-circuit, polarisation and impedance measurements.
- Price
- from£45 per sample, excl. VAT
- Turnaround
- 8 working days Preparation and scope dependent
- Available platforms
- Gamry Interface 1010E
- Typical outputs
- Open-circuit potentialPolarisation or Tafel curveCorrosion current or polarisation resistanceNyquist and Bode plots
Why this service
What Electrochemical Corrosion Testing can help you understand
Electrochemical corrosion testing examines the response of a material or coating in a defined electrolyte. Tafel, linear polarisation resistance and EIS routes provide different information and are…
How effective is a coating or inhibitor?
Linear polarisation resistance
How does corrosion behaviour evolve with exposure time?
Corrosion EIS and exposure study
Choose the scope
Start from the question, not the tool
The method, preparation route and reporting depth depend on what you need to decide.
Potentiodynamic polarisation
What are the corrosion potential and corrosion-current indicators?
- Best used when
- What are the corrosion potential and corrosion-current indicators?
- Typical result
- Open-circuit potential
- Preparation note
- Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements.
Linear polarisation resistance
How effective is a coating or inhibitor?
- Best used when
- How effective is a coating or inhibitor?
- Typical result
- Polarisation or Tafel curve
- Preparation note
- Confirm the applicable standard, dimensions, loading direction and number of replicates.
Corrosion EIS and exposure study
How does corrosion behaviour evolve with exposure time?
- Best used when
- How does corrosion behaviour evolve with exposure time?
- Typical result
- Corrosion current or polarisation resistance
- Preparation note
- Confirm power, connections, operating state, access restrictions and permitted disassembly.
Common outputs
A result package matched to the decision you need to make
Fields, conditions, processing and file formats are confirmed before work begins.
Open-circuit potential reported with the agreed units, sample reference and measurement conditions.
Polarisation or Tafel curve supplied in a labelled format suitable for direct sample or condition comparison.
Corrosion current or polarisation resistance provided with the processing basis and quality checks agreed during technical review.
Nyquist and Bode plots included when selected in the confirmed reporting scope.
Sample requirements
What to provide before work begins
Provide representative, clearly labelled samples and identify the decision, feature or comparison that matters.
| Suitable sample | Submission requirement | Planning note |
|---|---|---|
| Biological / soft material | Provide fixed, preserved or otherwise stabilised material in the agreed container and medium. | Declare biological hazards and confirm fixation, dehydration, temperature and disposal requirements. |
| Test coupon / specimen | Provide labelled specimens prepared to the agreed geometry, orientation and surface condition. | Confirm the applicable standard, dimensions, loading direction and number of replicates. |
| Device / assembly | Provide a complete labelled device or assembly with drawings, interfaces and operating limits. | Confirm power, connections, operating state, access restrictions and permitted disassembly. |
Objective: state the decision, comparison or acceptance criterion the work must support.
Handling and access: declare hazards, instability, confidentiality, file constraints or special logistics before dispatch or transfer.
Questions and answers
Common planning decisions
Short answers to issues that can change preparation, scope, timing or interpretation.
Which corrosion method should I choose?
Use the decision to choose: rapid tendency, rate indicator, coating barrier response or time-dependent degradation.
What is the typical turnaround?
Typical turnaround is 8 working days after sample acceptance and method confirmation.
Configure the service
Send the information needed to scope Electrochemical Corrosion Testing correctly
- Sample form, material, dimensions and quantity
- Feature or decision the result must address
- Required comparison, acceptance criterion or reference
- Preferred output and reporting depth