Electrochemical techniques correlation study of on‐line corrosion monitoring probes

Wu, Jian; Bai, Dan; Baker, Adam; Li, Z.-H.; Liu, X.-B.

doi:10.1002/maco.201307175

Cited by 30 publications

(11 citation statements)

References 25 publications

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“…Generally, at the same pH, R p values obtained in 0.2 M Cl − condition are higher than that in solutions containing 1.0 M Cl − . The higher the R p value, the stronger the corrosion prevention capability of the surface film [ 40 ]. So chloride reduces the passivity for the steel and this is more significant at low pH.…”

Section: Resultsmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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The electrochemical behaviour for passivation of new alloy corrosion-resistant steel Cr10Mo1 immersed in alkaline solutions with different pH values (13.3, 12.0, 10.5, and 9.0) and chloride contents (0.2 M and 1.0 M), was investigated by various electrochemical techniques: linear polarization resistance, electrochemical impedance spectroscopy and capacitance measurements. The chemical composition and structure of passive films were determined by XPS. The morphological features and surface composition of the immersed steel were evaluated by SEM together with EDS chemical analysis. The results evidence that pH plays an important role in the passivation of the corrosion-resistant steel and the effect is highly dependent upon the chloride contents. In solutions with low chloride (0.2 M), the corrosion-resistant steel has notably enhanced passivity with pH falling from 13.3 to 9.0, but does conversely when in presence of high chloride (1.0 M). The passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer enriched in Fe oxides and hydroxides, and an inner layer, rich in Cr species. The film composition varies with pH values and chloride contents. As the pH drops, more Cr oxides are enriched in the film while Fe oxides gradually decompose. Increasing chloride promotes Cr oxides and Fe oxides to transform into their hydroxides with little protection, and this is more significant at lower pH (10.5 and 9.0). These changes annotate passivation characteristics of the corrosion-resistant steel in the solutions of different electrolyte.

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Section: Resultsmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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“…Rp shows similar evolution as Ecorr, has enhanced values at low pH, increasing by 1/4 when pH falls from 13.3 to 9.0. Higher the Rp value, more difficult the corrosion process [18]. So carbonation (in the alkaline range) does not initiate and promote the corrosion of the steel, but contrary to what might be supposed, it causes a sedater corrosion rate for the steel.…”

Section: Electrochemical Measurements Linear Polarization Resistancementioning

confidence: 88%

Carbonation-corrosion resistant behaviour of corrosion-resistant steel Cr10Mo1 and its protection mechanism

Ai¹,

Jiang²,

Sun³

et al. 2016

Proceedings of the 2016 5th International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2016)

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The electrochemical response of new alloy corrosion-resistant steel Cr10Mo1 passivated under attack of carbonation (pH from 13.3 to 9.0), was evaluated by electrochemical techniques (linear polarization resistance, and electrochemical impedance spectroscopy). X-ray photoelectron spectroscopy (XPS) was used to characterize the composition and structure of the surface film on the steel. The results show that as carbonation progressing, the corrosion-resistant steel never goes to corrosion domain even when pH falls to 9.0，but has an increasing corrosion resistance. According to XPS analysis, the passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer enriched in Fe oxides and hydroxides, and an inner layer rich in Cr species. As the pH decreases, Fe oxides gradually decompose while more stable and protective Cr oxides get enriched in the film. Under carbonation attacking, the increasing Cr oxides in the film act as a protection barrier to the steel corrosion and support the corrosion-resistant steel still good passivity.

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“…It is seen that pipe sections with different diameters were used and a protrusion was arranged in the flow loop to establish an intense change of the flow field. In this system, a two-electrode system was applied for LPR measurement [103] and the corrosion rate could be directly obtained from the LPR measurement results. The total weight loss of the electrodes in the erosion-corrosion test was obtained from gravimetric measurements.…”

Section: Advances In the Monitoring Of Erosion-corrosion Using Speciamentioning

confidence: 99%

An Overview of Major Experimental Methods and Apparatus for Measuring and Investigating Erosion-Corrosion of Ferrous-Based Steels

Liu

Zhou

Wang

et al. 2020

Metals

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This paper firstly provides an overview of major efforts made over the past several decades on developing the test apparatus for the study of erosion-corrosion of ferrous-based steels. The merits and the application range of the set-ups, i.e., rotating disc/cylinder electrode system, slurry jet impingement rig, and test flow loop, are introduced. Secondly, the advantages and limitations of both non-electrochemical and electrochemical methods used for the measurement of erosion-corrosion are presented. Thereafter, the interaction between erosion and corrosion using a cyclic erosion-corrosion method was introduced. The synergy between erosion and corrosion for the steels under the passive state were analyzed on the basis of the breakdown and restoration of the passive film. In addition, the difference between the obtained erosion-enhanced corrosion and the corrosion-enhanced erosion using different experimental methods for steels under active corrosion was discussed. Finally, the interaction between the localized corrosion and erosion was studied through the dynamic change of the local current distribution revealed by the wire beam electrode.

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Electrochemical techniques correlation study of on‐line corrosion monitoring probes

Cited by 30 publications

References 25 publications

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Carbonation-corrosion resistant behaviour of corrosion-resistant steel Cr10Mo1 and its protection mechanism

An Overview of Major Experimental Methods and Apparatus for Measuring and Investigating Erosion-Corrosion of Ferrous-Based Steels

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