Effect of thioureas and triazoles on hydrogen penetration rates in iron

Journal Article · Sat Dec 01 04:00:00 EST 1979 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/0010-9312-35.12.535· OSTI ID:5056935

Dull, D L; Nobe, K

To examine various thiourea and triazole corrosion inhibitors for their effect on hydrogen penetration in iron, the University of California measured electrochemically the rates of hydrogen penetration in annealed iron in 1N H/sub 2/SO/sub 4/ containing the inhibitors. Corrosion rates were measured by the polarization method. At low organic concentrations, thiourea, phenylthiourea, tolythiourea, and triazole were corrosion accelerators, while at all the concentrations studied, benzotriazole and tolytriazole were corrosion inhibitors. All three thiourea compounds accelerated the hydrogen-penetration rate in iron, whereas the three triazole compounds were hydrogen-penetration inhibitors. Thiourea accelerated and tolyltriazole inhibited hydrogen penetration to the greatest extent. Correlations between the open-circuit hydrogen-penetration rate and the corrosion rate show that for the thiourea compounds, the open-circuit hydrogen penetration increases as the corrosion decreases. In contrast, the open-circuit hydrogen penertration decreases as the corrosion decreases for the three triazole compounds.

• OSTI ID: 5056935
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 35; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
AZOLES
CARBONIC ACID DERIVATIVES
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSIVE EFFECTS
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON
METALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PERFORMANCE TESTING
PERMEABILITY
SULFURIC ACID
TESTING
THIOUREAS
TRANSITION ELEMENTS
TRIAZOLES