Identification of steel corrosion in alkaline sulfate solution by electrochemical noise

Permeh, Samanbar; Lau, Kingsley; Duncan, Matthew; Simmons, Ron

doi:10.1002/maco.202112347

Cited by 12 publications

(6 citation statements)

References 25 publications

(37 reference statements)

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“…The spacer was also used to secure a microsaturated silver/silver‐chloride (Ag/AgCl) reference electrode. Details of the test setup can be found in Permeh et al [ 29 ] All test cells were assembled with sterile components and the test specimens were rinsed in deionized water and sterilized with ethanol solution before testing. The test cells were filled with 200 ml of solution collected from a natural water test site in Miami, Florida.…”

Section: Methodsmentioning

confidence: 99%

“…The electrochemical noise (EN) technique has been shown to differentiate corrosion modality. [24][25][26][27][28][29] Comparisons of the spontaneous transient noise current and potential signature, statistical analysis of noise in the time domain, power-spectral density (PSD), and shot noise analysis have been used to identify the development of localized corrosion. [24,30] Of particular interest to identify MIC, EN can ideally identify pitting corrosion [31][32][33][34][35] and other heterogeneities associated with reactions under biofilms.…”

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confidence: 99%

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Identification of steel corrosion associated with sulfate‐reducing bacteria by electrochemical noise technique

Permeh

Lau

2022

Materials & Corrosion

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Deterioration of steel structures in natural waters can result from microbiologically influenced corrosion (MIC) such as that caused by sulfate‐reducing bacteria (SRB). Corrosion pits associated with MIC have been recently observed in submerged steel bridge piles and there is renewed interest to assess their deterioration. Conventional electrochemical techniques to identify MIC have been complicated due to the effects of the surface films and the mechanism for charge transfer by the bacteria on the steel surface. An electrochemical noise (EN) technique to identify steel corrosion in an aqueous solution has been developed and the method ideally can identify the onset of local pitting, but complications and limitations relating to data acquisition, filtering, and interpretation exist. EN analysis was shown to differentiate SRB and corrosion activity including initial biofilm development, pitting corrosion development, and diminution of SRB activity. Electrochemical behavior, environmental characteristics, SRB activity, and corrosion modality provided consistent correlation to EN and localized corrosion development.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Identification of steel corrosion associated with sulfate‐reducing bacteria by electrochemical noise technique

Permeh

Lau

2022

Materials & Corrosion

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“…The electrochemical noise (EN) technique has several advantages that may be leveraged for corrosion monitoring. [28][29][30][31][32] The use of electrochemical techniques including EN to identify carbonation-induced corrosion is explored.…”

Section: Co + Ca(oh)mentioning

confidence: 99%

Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing

Permeh,

Lau

2024

Materials & Corrosion

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Carbonation‐induced corrosion of steel in concrete can allow for premature degradation of structures. Corrosion probes in health monitoring systems can assess concrete carbonation and steel corrosion rates. The electrochemical noise (EN) technique has advantages for corrosion sensing. Instrumented concrete columns were fitted with a carbonation chamber for accelerated testing. EN was assessed through statistical evaluation of noise time signatures, noise resistance, and spectral analysis. The mean noise potential for the electrodes showed electronegative potential and correspondingly high rms noise current, indicative of corrosion activation in carbonated concrete. The estimated corrosion rates obtained from the noise impedance were comparable to those resolved from the polarization resistance and noise resistance. The shot noise analysis indicated isolated spontaneous noise events associated with the activation of local steel anodes. The outcomes of the testing indicate that the placement of low‐cost sensors and passive EN measurements can be used to monitor the onset of carbonation‐induced corrosion of steel in concrete and provide estimates on corrosion rates.

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“…Due to the corrosion tendon failures in a Florida bridge in 2011 [8] associated with a prepackaged thixotropic grout that had developed material segregation, it was of interest to identify corrosion testing methods that would account for the susceptibility of grout materials to form physical and chemical deficiencies. It would be suggested that testing attuned to grout segregation (such as to identify grout robustness and corrosion mitigation) could be used to prescribe grouts resistant to aberrations in construction and provide greater confidence in material selection [38][39][40][41]. Full scale tendon mockups such as those required prior to bridge construction in Virginia for grout material selection may be cost prohibitive and excessive.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Post-Tensioned Grout Durability by Accelerated Robustness and Corrosion Testing

Permeh,

Lau

2023

Construction Materials

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The corrosion of steel in post-tensioned tendons has been associated with deficient grout materials containing high free sulfate ion concentrations. In a Florida bridge in 2011, tendon corrosion failures occurred for a prepackaged thixotropic grout that had developed material segregation. However, the available grout and corrosion testing prescribed in material specifications, such as grout bleed water testing, was not able to identify the propensity or modality for the grout deficiencies and the associated steel corrosion that was observed in the field. It was of interest to identify corrosion testing methods that could prescribe grout resistance to segregation-related deficiencies that can form by aberrations in construction. The objectives of the work presented here included (1) characterizing the development of physical and chemical grout deficiencies due to excess mix water and water volume displacement, (2) developing small scale test methodologies that identify deficient grout, and (3) developing test methodologies to identify steel corrosion in deficient grout. The inverted-tee test (INT) and a modified incline-tube (MIT) test were assessed and both were shown to be useful to identify the robustness of grout materials to adverse mixing conditions (such as overwatering and pre-hydration) by parameters such as sulfate content, moisture content, electrical resistance, and steel corrosion behavior. It was shown that the different grout products have widely different propensities for segregation and accumulation of sulfate ions but adverse grout mixing practices promoted the development of grout deficiencies, including the accumulation of sulfate ions. Corrosion potentials of steel < −300 mVCSE developed in the deficient grout with higher sulfate concentrations. Likewise, the corrosion current density showed generally high values of >0.1 μA/cm2 in the deficient grouts. The values produced from the test program here were consistent with historical data from earlier research that indicated corrosion conditions of steel in deficient grout with >0.7 mg/g sulfate, further verifying the adverse effects of elevated sulfate ion concentrations in the segregated grout.

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Identification of steel corrosion in alkaline sulfate solution by electrochemical noise

Cited by 12 publications

References 25 publications

Identification of steel corrosion associated with sulfate‐reducing bacteria by electrochemical noise technique

Identification of steel corrosion associated with sulfate‐reducing bacteria by electrochemical noise technique

Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing

Assessment of Post-Tensioned Grout Durability by Accelerated Robustness and Corrosion Testing

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