Kinetics of Zinc Corrosion in Concrete as a Function of Water and Oxygen Availability

Autor: Vojtěch Kučera, Petr Pokorný, Milan Kouřil
Rok vydání: 2019
Předmět:
Materials science
Passivation
020209 energy
Kinetics
0211 other engineering and technologies
Salt (chemistry)
chemistry.chemical_element
calcium hydroxyzincate (CHZ)
02 engineering and technology
Zinc
lcsh:Technology
Oxygen
Article
Corrosion
hot-dip galvanized reinforcement
symbols.namesake
021105 building & construction
Oxidizing agent
0202 electrical engineering
electronic engineering
information engineering
General Materials Science
lcsh:Microscopy
lcsh:QC120-168.85
chemistry.chemical_classification
corrosion of steel in concrete
lcsh:QH201-278.5
lcsh:T
zinc
Metallurgy
Galvanization
chemistry
lcsh:TA1-2040
kinetics
electrical resistance
symbols
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Zdroj: Materials
Materials, Vol 12, Iss 17, p 2786 (2019)
Volume 12
Issue 17
ISSN: 1996-1944
DOI: 10.3390/ma12172786
Popis: This paper studies the effect of water as an oxidation agent and also of oxygen on zinc corrosion kinetics in active state in concrete, using high-sensitivity electrical resistance sensors. It was proven that zinc corrosion in active state is strongly affected by the presence of water at its surface. Zinc corrosion in real concrete in the absence of water can be misinterpreted as salt passivity. The presence of oxygen results in an increase of zinc corrosion rate, however at pH 12.6, passivity can occur. It was verified that corrosion products consisting primarily of Ca[Zn(OH)3]2·
2H2O cannot effectively passivate zinc surface in concrete, even after 1800 h of exposure and zinc, or hot-dip galvanized steel can corrode at an unacceptable corrosion rate (more than 4 µ
m·
a&minus
1).
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje