Corrosion resistance of hot-dip galvanized steel in simulated soil solution: A factorial design and pit chemistry study

Nakhaie, Davood; Kosari, Ali; Mol, J.M.C.; Asselin, Edouard

doi:10.1016/j.corsci.2019.108310

Cited by 41 publications

(23 citation statements)

References 71 publications

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“…No blisters on coating panels were observed after 500 h of exposure, which reflected their good adhesion to the substrate. All the coated panels showed white rust after 500 h of exposure, which corresponds to the sacrificial dissolution of zinc and formation of Zn 5 (OH) 2 Cl 8 corrosion product [ 39 , 40 ]. Many studies in the past have explained that corrosion of the galvanized steel occurs in three stages [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Sacrificial Dissolution of Zinc Electroplated and Cold Galvanized Coated Steel in Saline and Soil Environments: A Comparison

et al. 2021

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To protect steel structures, zinc coatings are mostly used as a sacrificial barrier. This research aims to estimate the dissolution tendency of the electroplated and zinc-rich cold galvanized (ZRCG) coatings of a controlled thickness (35 ± 1 mm) applied via brush and dip coating methods on the mild steel. To assess the corrosion behavior of these coated samples in 3.5% NaCl and 10% NaCl containing soil solutions, open circuit potential (OCP), cyclic polarization (CP), and electrochemical impedance spectroscopy (EIS) tests were performed. The more negative OCP and appreciably large corrosion rate of the electroplated and ZRCG coated samples in 3.5% NaCl solution highlighted the preferential dissolution of Zn coatings. However, in saline soil solution, the relatively positive OCP (>−850 mV vs. Cu/CuSO4) and lower corrosion rate of the electroplated and ZRCG coatings compared to the uncoated steel sample indicated their incapacity to protect the steel substrate. The CP scans of the zinc electroplated samples showed a positive hysteresis loop after 24 h of exposure in 3.5% NaCl and saline soil solutions attributing to the localized dissolution of the coating. Similarly, the appreciable decrease in the charge transfer resistance of the electroplated samples after 24 h of exposure corresponded to their accelerated dissolution. Compared to the localized dissolution of the electroplated and brush-coated samples, the dip-coated ZRCG samples exhibited uniform dissolution during the extended exposure (500 h) salt spray test.

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Section: Resultsmentioning

confidence: 99%

Sacrificial Dissolution of Zinc Electroplated and Cold Galvanized Coated Steel in Saline and Soil Environments: A Comparison

et al. 2021

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“…The zinc-plated layer on the surface can form a dense oxide film to protect the inner steel substrate. When the zinc-plated layer and the steel substrate form a corrosion cell, because the electrode potential of zinc is more negative, zinc corrodes and dissolves as the anode of the corrosion cell, and steel is protected as a cathode [ 34 , 35 ]. However, through actual tests, it is found that the application effect of galvanized steel as a grounding anticorrosion conductor is not ideal.…”

Section: The Formation Mechanism and Influencing Factors Of Soil Corrosionmentioning

confidence: 99%

Research Advances of Soil Corrosion of Grounding Grids

Zhang

Liao²,

Xue

et al. 2021

Micromachines

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A grounding grid plays the role of discharging current and balancing voltage to ensure the safety of the power system. However, soil corrosion can damage the grounding grid, which then can endanger the safe operation of power system. This paper reviewed recent research advances of soil corrosion of grounding grid. The cause, mechanism, types, and influencing factors of soil corrosion of grounding grids were summarized, and the corresponding detection technology and protective measures were also introduced. The paper pointed out that soil corrosion is a serious threat to the grounding grid system. Moreover, the impact mechanism of AC stray current, new corrosion detection technology, and better protective measures still need in-depth research.

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“…Diffusion is the mode of transport of soil under conditions such as isothermal conditions within the soil structure. The Fick's law modeled diffusion as a mode of transport of oxygen by adjusting diffusion coefficient adjusted to suit the soil factors and elements for the reduction of the area available for diffusion to occur [58][59][60]. The moisture content and the porosity of the soil affected the rate of diffusion in the soil [61].…”

Section: Soil Electrolyte and Diffusion Of Oxygenmentioning

confidence: 99%

Corrosion in underground infrastructures

Mukhtar

2021

Koroze a Ochrana Materialu

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There is a significant loss due to corrosion of buried infrastructure. Many pipes have failed due to mistreatment happening within them all around the world. Different soil aeration leads to macro corrosion cells that cause critical levels within the path corrosion leading to a loss of structural integrity of the buried pipes underground. This review paper seeks to address and presents a predetermined model developed by using software COMSOL Multiphysics to identify and characterize the areas experiencing a high rate of corrosion beneath the surface due to differential aeration. The pipe surfaces experience electrochemical reactions and reactant transport mechanisms in the soil and the pipes. Porosity and degree of saturation make the closed-form equations used to create the mass transport properties and electrical properties that constitute three-phase medium using standard soil parameters. The current model enables the study of soil property variations and conditions from the external environment pipeline corrosion. The model results conclude and agree well with the literature and case studies done at pipeline failure sites. The model used in this review will then enable water utilities to develop forecasting tools that may be useful for assessment.

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Corrosion resistance of hot-dip galvanized steel in simulated soil solution: A factorial design and pit chemistry study

Cited by 41 publications

References 71 publications

Sacrificial Dissolution of Zinc Electroplated and Cold Galvanized Coated Steel in Saline and Soil Environments: A Comparison

Sacrificial Dissolution of Zinc Electroplated and Cold Galvanized Coated Steel in Saline and Soil Environments: A Comparison

Research Advances of Soil Corrosion of Grounding Grids

Corrosion in underground infrastructures

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