Experimental evidence of hydrogen evolution from local anodic corrosion sites and its consequences for corrosion cracking mechanisms
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Hans Hoffmeister
Prof. Dr.-Ing. Hans Hoffmeister, born in 1932, studied Ferrous Metallurgy at the Technical University Clausthal-Zellerfeld. After 6 years of industrial practice with Klöcknerwerke AG, Osnabrück, he returned to Clausthal as an academic lecturer and in 1974 took the chair of Material Science and Welding at the Helmut Schmidt University at Hamburg. In 1997 he retired and founded the Institute for Failure Analysis and Failure Prevention at the Helmut Schmidt University.
and
Eike Heuser
Eike Heuser, born in 1994, studied Materials Engineering with focus on metals and ferrous metallurgy at the RWTH Aachen University. He is currently working as a scientist at the Helmut Schmidt University / University of the Federal Armed Forces in the fields of corrosion of stainless steels and hydrogen influence on steel properties. During his work at the ISSV he is involved in failure analysis and failure prevention.
Abstract
Based on observation of gas bubbles evolving from crevices on slow strain rate test pieces during anodic corrosion the effect of applied potentials in chloride aqueous solutions on amount and composition of the gas together with fracture strains from the slow strain rate test of a 17-4 PH steel was investigated. As a result, increasing applied potentials provide a reduction of fracture strains together with an initial increase in volume of released hydrogen gas. The fracture surfaces exhibit increasing brittle appearance, as found in hydrogen cracking failures. The results confirm that during local anodic corrosion, hydrogen is produced that provokes hydrogen induced cracking following anodic dissolution. Respective local pH measurements under varying applied electric potentials, show the acidification of the pit-electrolyte. Additional model calculations elucidate the stepwise local anodic corrosion and its acidification process together with the hydrogen supported cracking. The model shows that the relative amount of hydrogen cracking will depend on the provided material data as well as on solution properties such as pH, chloride level, temperature and oxygen content. As an all over result, together with the model calculations, the experimental evidence of hydrogen evolution during anodic local corrosion confirms the contribution of hydrogen cracking to anodic stress corrosion cracking.
About the authors
Prof. Dr.-Ing. Hans Hoffmeister, born in 1932, studied Ferrous Metallurgy at the Technical University Clausthal-Zellerfeld. After 6 years of industrial practice with Klöcknerwerke AG, Osnabrück, he returned to Clausthal as an academic lecturer and in 1974 took the chair of Material Science and Welding at the Helmut Schmidt University at Hamburg. In 1997 he retired and founded the Institute for Failure Analysis and Failure Prevention at the Helmut Schmidt University.
Eike Heuser, born in 1994, studied Materials Engineering with focus on metals and ferrous metallurgy at the RWTH Aachen University. He is currently working as a scientist at the Helmut Schmidt University / University of the Federal Armed Forces in the fields of corrosion of stainless steels and hydrogen influence on steel properties. During his work at the ISSV he is involved in failure analysis and failure prevention.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Experimental evidence of hydrogen evolution from local anodic corrosion sites and its consequences for corrosion cracking mechanisms
- Weldability and mechanical behavior of CMT welded AISI 430 and HARDOX 500 steels
- Mechanical properties and microstructural features of rotary friction welded UNS S42000 martensitic stainless-steel joints
- Decarburization effects on high-cycle fatigue of uncoated press hardened steels
- Non-destructive detection for mosaic ceramic surface defects based on convolutional neural networks
- Low-velocity impact behaviours of sandwiches manufactured from fully carbon fiber composite for different cell types and compression behaviours for different core types
- Microstructural and numerical variation of friction spot welded AA7075 couples
- Crushing performance and optimization of bio-inspired multi-cell columns
- Collapse of a honeycomb sandwich composite in an aircraft radome
- A multi-strategy boosted prairie dog optimization algorithm for global optimization of heat exchangers
- Indentation creep behavior of Fe–8Ni–xZr oxide dispersion strengthened alloys
- Mechanical and tribological behavior of a hybrid WC and Al2O3 reinforced Al–4Gr composite
- Effect of vibration and cutting zone temperature on surface topography during hybrid cooling/lubrication assisted machining of Vanadis 10
- Thermal and mechanical properties of a new insulation composite material
