Hydrogen Embrittlement explained - C-Ring tension bending test

Hydrogen can be generated in production processes as a result of manufacturing. Hydrogen embrittlement is a complex system property that is composed of the material, the phase boundaries, the hydrogen supply and the mechanical load. In 180 seconds, the complex property of hydrogen embrittlement is reduced to an energy-based material characteristic value by means of C-ring stress testing (e.g. DIN 50969-2, EN ISO 7539-5). Test times can be reduced from 24h to less than three minutes. This enables in situ process monitoring of production-related hydrogen embrittlement.
More information:
- Measuring method: www.ichemanaly...
- Further information on pickling products and electrolytes: schloetter.de/...
- Very interesting video from the company Schlötter: www.youtube.co...
Sources:
- Wasserstoffversprödung bei galvanischen Prozessen - Teil 1 bis 3, ZVO-Report: www.ichemanaly...
- I. M. Robertson, P. Sofronis, A. Nagao, et al., “Hydrogen embrittlement understood,”: link.springer....
- DIN 50969, Vermeidung fertigungsbedingter wasserstoffinduzierter Sprödbruche bei hochfesten Bauteilen aus Stahl - Teil 2: Prüfungen
- DIN EN ISO 7539-5, Korrosion der Metalle und Legierungen - Prüfung der Spannungsrißkorrosion - Teil 5 Vorbereitung und Anwendung von C-Ring-Proben

[@MathewGeorge-vf3bt]

May I ask, is any hydrogen released from the test material during the tension bending test? Thank you.

[@ichemanalyticsgmbh4746]

In fact, hydrogen is very diffusible and escapes from the material over time. This also happens during the test.