Corrosion of galvanized steel in alkaline solution associated with sulfate and chloride ions

Permeh, Samanbar; Lau, Kingsley

doi:10.1016/j.conbuildmat.2023.131889

Cited by 21 publications

(5 citation statements)

References 27 publications

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“…However, when the chloride concentration surpasses D2, the weight loss rate begins to rise again, which may be attributed to the protective effect of the rust layer. Previous studies [14][15][16] have indicated the presence of a critical concentration of chloride ions. Once the chloride ion concentration reaches a certain level, it causes a shift in the weight loss rate.…”

Section: Weightlessness Rate and Surface Morphology Analysismentioning

confidence: 98%

Corrosion and wear behavior of slag cleaning chain and influence of Cr, Ni and Mo under different chloride ion concentration

Bai,

Ma,

Wang

et al. 2024

Matéria (Rio J.)

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To address the issue of corrosive wear resulting from the addition of desulphurization wastewater into the wet slag removal system, this study investigated the corrosive wear behavior of chain steel (specifically 17NiCrMo6 steel) in desulphurization wastewater with varying chloride concentrations. Weight loss, microphase characterization, and electrochemical testing methods were employed for analysis. The findings indicate that as the chloride concentration increases, the weight loss rates for both pure corrosion and corrosive wear exhibit a pattern of initial increase, followed by a decrease, and then another increase. This trend can be attributed to the fact that as the chloride concentration rises, the corrosion products become denser, thereby increasing the difficulty of the corrosion reaction.

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Section: Weightlessness Rate and Surface Morphology Analysismentioning

confidence: 98%

Corrosion and wear behavior of slag cleaning chain and influence of Cr, Ni and Mo under different chloride ion concentration

Bai,

Ma,

Wang

et al. 2024

Matéria (Rio J.)

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“…The procedure has since been used on PT tendons at risk of corrosion on other bridges, buildings, and industrial structures in Florida, Virginia, New York, Ontario, Newfoundland, and the UK. The field case study also showed severe corrosion of galvanized steel components in the presence of deficient grout [43,44]. The development of an accelerated corrosion test that considers the robustness of grout materials in terms of corrosion durability ideally could disseminate the beneficial effects of corrosion mitigation technologies such as the inhibitor impregnation as well as performance of other metallic component such as galvanized steel.…”

Section: Introductionmentioning

confidence: 95%

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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“…It is well known that Cl − ions constitute the primary environmental factor influencing the corrosion resistance of steel [8][9][10]. Penetration by Cl − ions can loosen and induce porosity in the corrosion product film, which promotes contact between the electrolyte solution and steel matrix and further accelerates the corrosion of the steel matrix [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Corrosive Influence of Chloride Ions on Slag Recovery Machine Inner Guide Wheel in Power Plants

Hu,

Ma,

Bai

et al. 2024

Materials

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An important method that coal-fired power plants use to realise low-cost zero discharge of desulfurisation wastewater (FGD wastewater) is to utilise wet slag removal systems. However, the high Cl− content of FGD wastewater in wet slag removal systems causes environmental damage. In this study, the corrosion behaviour of the inner guide wheel material, 20CrMnTi, was studied using dynamic weight loss and electrochemical methods. X-ray diffraction, scanning electron microscopy, and energy spectroscopy were used to analyse the organisational and phase changes on the surfaces and cross sections of the samples at different Cl− concentrations. The corrosion rate increased with the Cl− concentration up to 20 g/L, but it decreased slightly when the Cl− concentration exceeded 20 g/L. In all the cases, the corrosion rate exceeded 0.8 mm/a. The corrosion product film density initially increased and then decreased as the Cl− concentration increased. The corrosion products comprised mainly α-FeOOH, γ-FeOOH, β-FeOOH, Fe3O4, and γ-Fe2O3.

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Corrosion of galvanized steel in alkaline solution associated with sulfate and chloride ions

Cited by 21 publications

References 27 publications

Corrosion and wear behavior of slag cleaning chain and influence of Cr, Ni and Mo under different chloride ion concentration

Corrosion and wear behavior of slag cleaning chain and influence of Cr, Ni and Mo under different chloride ion concentration

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

Investigating the Corrosive Influence of Chloride Ions on Slag Recovery Machine Inner Guide Wheel in Power Plants

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