NPL plays a key role in the development of international standards for corrosion testing, especially in the International Standards Organisation (ISO) and NACE International, and to a smaller extent in ASTM. NPL is also involved in standards activity in hydrogen and fuel cells, primarily through ISO and BSI.

ISO

Alan Turnbull is an active member of working groups in ISO TC156, Corrosion of Metals and Alloys, and is convenor of Working Group 2 (WG2) on Environmentally Assisted Cracking.

Current standards under development in WG2

• ISO CD 7539 'Part 11: Corrosion of metals and alloys' Stress corrosion testing: Guidelines for testing the resistance of metals and alloys to hydrogen embrittlement and hydrogen assisted cracking, circulated for voting as a Draft International Standard (DIS)
• ISO/CD 7539-1: Corrosion of metals and alloys – Stress corrosion testing: General Guidance on testing procedures, updated version being circulated for voting as a DIS.
• ISO/CD 21601: Guidelines for assessing the significance of stress corrosion cracks detected in service, being circulated for voting as a DIS
• ISO/WD 6509: Corrosion of metals and alloys: Determination of dezincification resistance of brass and acceptance criteria, updated version being circulated for voting as a Committee Draft (CD)
• ISO/WD 16540: Corrosion of metals and alloys: Methodology for determining the resistance of metals to stress corrosion cracking using the four-point bend, being circulated for voting as a CD

Previously published standards on environmentally assisted cracking

• ISO 7539-1: Corrosion of metals and alloys – Stress corrosion testing: General guidance on testing procedures
• ISO 7539-2: Corrosion of metals and alloys – Stress corrosion testing: Preparation and use of bent-beam specimens
• ISO 7539-3: Corrosion of metals and alloys – Stress corrosion testing: Method for the preparation and use of U-bend specimens
• ISO 7539-4: Corrosion of metals and alloys – Stress corrosion testing: Method for the preparation and use of uniaxially loaded tension specimens
• ISO 7539-5: Corrosion of metals and alloys – Stress corrosion testing: Preparation and use of C-ring specimens
• ISO 7539-6: Corrosion of metals and alloys – Stress corrosion testing: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement
• ISO 7539-7: Corrosion of metals and alloys – Stress corrosion testing: Slow strain rate testing
• ISO 7539-8: Corrosion of metals and alloys – Stress corrosion testing: Preparation and use of specimens to evaluate weldments
• ISO 7539-9: Corrosion of metals and alloys – Stress corrosion testing: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement
• ISO 11782-1: Corrosion of metals and alloys – Corrosion fatigue testing – Part 1: Cycles to failure testing
• ISO 11782-2: Corrosion of metals and alloys – Corrosion fatigue testing – Part 2: Crack propagation testing using pre-cracked specimens
• ISO 15324: Corrosion of metals and alloys - Evaluation of stress corrosion cracking by the drop evaporation test
• ISO 17081: Method of measurement of hydrogen permeation and determination of hydrogen uptake and transport in metals by an electrochemical technique.

Contact: Alan Turnbull

NACE International

• Slow Strain Rate Test Method for Screening Corrosion-Resistant Alloys for Stress Corrosion Cracking in Sour Oilfield Service
  (Publication due early 2012)
• Methodology for determining the resistance of metals to stress corrosion cracking using the four-point bend
  (Draft under development in Task Group TG 085F)

Contact: Alan Turnbull

BSI

Gareth Hinds is a member of BSI Technical Committee GEL 105 (Fuel Cell Technologies). Under the direction of the British Electrotechnical Committee and the Standards Policy and Strategy Committee, this committee is responsible for standards in the field of fuel cell (FC) technologies for all FC applications such as stationary FC power plants; FC for transportation such as FC propulsion systems and auxiliary power units; and portable FC power generation systems, as well as for providing UK input into the work of IEC/TC105.

Contact: Gareth Hinds