Hydrogen corrosion

The hydrogen or acid corrosion is a form of corrosion in metals, in the presence of water, however, a lack of oxygen to form elemental hydrogen leads. In addition to oxygen corrosion , it is also involved in the formation of rust .

procedure

In contact with water, the metal is oxidized and goes into solution as an ion , releasing electrons. In an aqueous acidic medium, the protons of the oxonium ions contained in this medium are reduced to hydrogen by absorbing the electrons formed, and water is also formed. This reaction can often be found using the example of iron:

${\displaystyle \mathrm {Fe} \;\rightarrow \;\mathrm {Fe} ^{2+}\;+\;2\,\mathrm {e} ^{-}}$ (Oxidation of the metal)

${\displaystyle 2\,\mathrm {H} _{3}\mathrm {O} ^{+}\;+\;2\,\mathrm {e} ^{-}\rightarrow \;\mathrm {H} _{2}\;+\;2\,\mathrm {H} _{2}\mathrm {O} }$ (Reduction of oxonium ions)

literature

• Gustav Peter, René Muntwyler, Marc Ladner: Building materials theory. Guide to planning and practice. 2nd Edition. University publisher at ETH Zurich, Zurich 2005, ISBN 3-7281-3005-2 , pp. 21-22.
• Horst Briehl: Chemistry of Materials. 3. Edition. Springer Fachmedien, Wiesbaden 2014, ISBN 978-3-658-06225-5 , pp. 108-110.

See also

• Hydrogen embrittlement
• Redox reaction
• corrosion
• Electrochemical series

Web links

• Selected corrosion elements and their reactions (accessed on September 6, 2018)
• Corrosion and Corrosion Protection (accessed September 6, 2018)
• Basics of construction chemistry, electrochemistry, chemistry of metals (accessed on September 6, 2018)
• Corrosion damage analysis (accessed on September 6, 2018)
• Test methods to avoid hydrogen-related brittle fractures in the event of corrosion exposure (accessed on September 6, 2018)