Overview
EN ISO 17463:2022 (ISO 17463:2022) provides guidelines for determining the anticorrosive properties of organic coatings on metals using the accelerated cyclic electrochemical technique (ACET). The standard describes the AC/DC/AC sequence-repeated cycles of electrochemical impedance spectroscopy (EIS), cathodic polarization, and potential relaxation-to accelerate and monitor coating degradation and evaluate coating permeability and adhesion in shortened test times. Examples of typical results are shown in Annex A.
Key Topics and Requirements
- Scope and principle
- Purpose: qualitative and quantitative comparison of protective performance of coating systems.
- Principle: cycles of EIS → cathodic polarization → relaxation to induce and monitor degradation.
- Test execution
- Perform initial and periodic EIS measurements (frequency response), followed by defined cathodic polarization steps and a relaxation time before subsequent EIS.
- Monitor changes in impedance and potential over cycles to assess coating performance.
- Specimen and apparatus considerations
- Guidance on sample preparation, environmental control and specimen count to ensure repeatability.
- Use of an electrochemical cell compatible with coated metallic specimens.
- Test parameters
- Definitions and control of cathodic potential, polarization duration and relaxation time (operator-defined).
- Number of cycles and data collection schedules to capture degradation progression.
- Data presentation
- Recommended presentation formats: Bode plots, Nyquist plots, relaxation curves and other relevant graphical outputs for EIS and potential relaxation.
- Reporting and precision
- Required test report elements and notes on repeatability/precision; Annex A provides typical result examples.
Applications and Who Uses It
- Coating manufacturers assessing new formulations for anticorrosive performance.
- Corrosion engineers and materials scientists evaluating coating permeability, adhesion and cathodic disbonding tendencies.
- Independent testing laboratories performing accelerated comparative tests for specifications, R&D and quality control.
- Specifiers and regulatory bodies seeking standardized comparative data for procurement and compliance.
Practical benefits include faster screening of coating systems, reproducible electrochemical diagnostics of degradation mechanisms, and standardized graphical outputs (Bode/Nyquist/relaxation curves) for decision-making.
Related Standards
- ISO 16773-1 - EIS terms and definitions for coated and uncoated metallic specimens
- ISO 16773-2 - Collection of EIS data for coated and uncoated metallic specimens
- ISO 2808 - Determination of film thickness (referenced for sample preparation)
- ISO 8044, ISO 15711 (terms referenced, e.g., cathodic polarization, cathodic disbonding)
Keywords: EN ISO 17463:2022, ACET, accelerated cyclic electrochemical technique, EIS, cathodic polarization, potential relaxation, Bode plots, Nyquist plots, paints and varnishes, organic coatings, anticorrosive testing.