Corrosion rate monitoring in the laboratory and on-site

doi:10.1016/0950-0618(95)00044-5

Construction and Building Materials

Volume 10, Issue 5, July 1996, Pages 315-328

https://doi.org/10.1016/0950-0618(95)00044-5 Get rights and content

Abstract

The loss of metal per unit of surface and time defines the metallic corrosion rate. A review is made of the different electrochemnical methods used for measuring this parameter. Thus, polarization curves, polarization resistance transient techniques and electrochemical impedance are commented on. Some semiquantitative methods such as the measurement of the corrosion potential, concrete resistivity or galvanic current are also discussed. Concerning the application of electrochemical techniques for measuring corrosion rates on-site, the paper reviews some of the methods published in the literature with special attention to the sensorized confinement of the current. Finally, the values of corrosion rate measured in concrete specimens in the laboratory and on-site are given and levels of risk regarding loss in rebar cross-section are suggested.

References (47)

J.A. González et al.
Comparison of rates of general corrosion and maximum pitting penetration on concrete embedded steel reinforcements
Cement Concr. Res.
(1995)
R.N. Parkins
Predictive approaches to stress corrosion cracking failure
Corros. Sci.
(1980)
W.J. Lorenz et al.
Determination of corrosion rates by electrochemical DC and AC methods
Corros. Sci.
(1981)
J.A. González et al.
Errors in thȩ electrochemical evaluation of very small corrosion rates. Part I. Polarization resistance method applied to corrosion of steel in concrete
Corros. Sci.
(1985)
C.J. Newton et al.
A galvanostatic pulse technique for investigation of steel corrosion in concrete
Corros. Sci.
(1988)
S. Feliú et al.
The determination of the corrosion rate of steel in concrete by a nonstationary method
Corros. Sci.
(1986)
C. Alonso et al.
Relation between concrete resistivity and corrosion rate of the reinforcements in carbonated mortar made with several cement types
Cement Concr. Res.
(1988)
C. Andrade et al.
The effect of macrocells between active and passive areas of steel reinforcement
Corros. Sci.
(1992)
S. Feliú et al.
Determining polarization resistance in reinforced concrete slabs
Corros. Sci.
(1989)
M. Pourbaix

H. Kaesche

Testing corrosion danger of steel reinforcement due to admixtures in concrete

Zement-Kalk-Gips

(1973)

A. Baümell

The effect of additives on the corrosion behaviour of steel in concrete

Zement-Kalk-Gips

(1959)

C. Andrade

Nueva técnica electroquimica de medida de la corrosion de armaduras en hormigones armados y pretensados. Empleo de aditivos inhibidores como método de protección

G. John et al.

Brit. Corros. J.

(1981)

K. Tuutti

Corrosion of steel in concrete

Swedish Cement and Concrete Institute (CBI) no 4-82

(1982)

J. Calleja et al.

Prevención de la corrosion de armaduras en el hormigon mediante aditivos inhibidores

Materielles de Construcción

(1973)

C. Alonso et al.

The electrochemical behaviour of steel reinforcements in Na₂CO₃ and NaHCO₃ solutions in relation to stress corrosion cracking

Corros. Sci.

(1989)

Stratfull Criteria for cathodic protection of bridge decks

M. Stern et al.

Electrochemical polarization: I. A. theoretical analysis of the shape of polarization curves

J. Electrochem. Soc.

(1957)

C. Wagner et al.

Concerning the evaluation of corrosion reactions by superposition of electrochemical partial reactions and concerning the potential formation on mixed electrodes

Z. Elektrochm.

(1938)

M. Stern et al.

Experimental observations on the relations between polarization resistance and corrosion rate

C. Andrade et al.

Quantitative measurements of corrosion rate of reinforcing steels embedded in concrete using polarization resistance measurements

Werkstoffe und Korrosion

(1978)

A. Sagüés

Electrochemical impedance of corrosion macrocells on reinforcing steel in concrete

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Corrosion rate monitoring in the laboratory and on-site

Abstract

Cement Concr. Res.

Corros. Sci.

Corros. Sci.

Corros. Sci.

Corros. Sci.

Corros. Sci.

Cement Concr. Res.

Corros. Sci.

Corros. Sci.

Testing corrosion danger of steel reinforcement due to admixtures in concrete

Zement-Kalk-Gips

The effect of additives on the corrosion behaviour of steel in concrete

Zement-Kalk-Gips

Nueva técnica electroquimica de medida de la corrosion de armaduras en hormigones armados y pretensados. Empleo de aditivos inhibidores como método de protección

Brit. Corros. J.

Corrosion of steel in concrete

Swedish Cement and Concrete Institute (CBI) no 4-82

Prevención de la corrosion de armaduras en el hormigon mediante aditivos inhibidores

Materielles de Construcción

The electrochemical behaviour of steel reinforcements in Na2CO3 and NaHCO3 solutions in relation to stress corrosion cracking

Corros. Sci.

Stratfull Criteria for cathodic protection of bridge decks

Electrochemical polarization: I. A. theoretical analysis of the shape of polarization curves

J. Electrochem. Soc.

Concerning the evaluation of corrosion reactions by superposition of electrochemical partial reactions and concerning the potential formation on mixed electrodes

Z. Elektrochm.

Experimental observations on the relations between polarization resistance and corrosion rate

Quantitative measurements of corrosion rate of reinforcing steels embedded in concrete using polarization resistance measurements

Werkstoffe und Korrosion

Electrochemical impedance of corrosion macrocells on reinforcing steel in concrete

The electrochemical behaviour of steel reinforcements in Na₂CO₃ and NaHCO₃ solutions in relation to stress corrosion cracking