Overview
EN ISO 11463:2020 (ISO 11463:2020) provides internationally harmonized guidelines for the evaluation of pitting corrosion of metals and alloys. The standard helps users select appropriate procedures to identify and examine corrosion pits, measure pit severity and pit growth rate, and report results consistently. The 2020 edition supersedes earlier versions (EN ISO 11463:2008 / ISO 11463:1995) and reflects updated surface‑analysis techniques.
Key topics
- Identification and examination of pits
- Preliminary low‑magnification visual inspection and photographic documentation
- Optical microscopy (e.g., ~×20) to assess pit size, shape and distribution
- Cleaning recommendations (mechanical and chemical) - ISO 8407 is cited for chemical cleaning processes
- In‑situ non‑destructive inspection techniques
- Radiographic, electromagnetic, ultrasonic methods
- Penetrant testing and replication for surface detail
- Ex‑situ characterisation techniques
- Scanning electron microscopy (SEM), X‑ray computed tomography (XCT)
- Image analysis and profilometry for quantitative pit geometry
- Extent and measurement of pitting
- Mass loss approaches and multiple pit‑depth measurement methods:
- Metallography (cross‑section)
- Machining and sectioning
- Micrometers/depth gauges and microscopy
- Evaluation and reporting
- Use of standard charts, metal‑penetration metrics (e.g., pit depths, area), and statistical approaches to quantify pitting severity and growth rate
- Requirements for content of a test report (consistent documentation for comparative or forensic use)
Applications
- Assessing service damage to estimate remaining life of metal structures and components
- Laboratory test programmes to compare and select pitting‑resistant materials and coatings
- Forensic failure analysis where pits may be precursors to stress‑corrosion cracking or corrosion fatigue
- Quality control of coatings and corrosion protection systems
Who should use this standard
- Corrosion engineers and materials scientists
- Failure analysts and forensic investigators
- Test laboratories and inspection bodies
- Asset owners and maintenance teams in oil & gas, marine, chemical processing, infrastructure and transport sectors
- Coatings and surface‑treatment professionals
Related standards and context
- The document was prepared by ISO/TC 156 in collaboration with CEN/TC 262. It references ISO 8407 for chemical cleaning of corrosion products and aligns evaluation practice with other ISO/CEN corrosion testing guidance.
Keywords: pitting corrosion, pit growth rate, corrosion inspection methods, EN ISO 11463:2020, evaluation of pitting corrosion, corrosion of metals and alloys.