Wasserstoff anfalligkeit -Zusammenfassung experimenteller Werte und quantenchemischer ErkenntnisseOn the diffusion and interaction of hydrogen in prestressing steels of different sensitivity against hydrogensummarized experimental data and quantumchemical results R. Frey und Th. Kruger* Die Untersuchung der Beeinflussung von baupraktischen Spannstahlen durch Wasserstoff ergibt, daB in der Praxis nachweislich infolge Wasserstoffeinwirkung schadhaftes Material durch einen gesteigerten Wasserstoff-Diffusionskoeffizienten bereits im ungespannten Zustand gekennzeichnet ist. Hierfiir enveisen sich spezifische Struktureinfliisse von inneren Oberflachen mit Storstellen, selbst nur von reinen Eisenoberflschen. als entscheidend. Tritt Wasserstoff mit ihnen in Wechselwirkung, kann er allein dort ortlich den Metallzusammenhalt lockern und so beim gespannten Stahl RiBbildung ermoglichen.Investigation of the influence of hydrogen on prestressing steels used as building materials shows that material involved in practical damage by hydrogen-influence is characterized by a higher hydrogendiffusion coefficient already of the not tensioned material. Responsible for this is a specific influence of inner surfaces coming into existence by local material defects. Their metastable reaction with hydrogen may lead to local decohesion of the metallic bond and so cracks may be induced if the steel is tensioned.
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