Study of local Na+ and Cl− distributions during the cut-edge corrosion of aluminum rich metal-coated steel by scanning vibrating electrode and micro-potentiometric techniques

Alvarez-Pampliega, A.; Taryba, Maryna; Bergh, K. Van den; Strycker, Joost De; Lamaka, Sviatlana V.; Terryn, Herman

doi:10.1016/j.electacta.2013.03.186

Cited by 28 publications

(27 citation statements)

References 57 publications

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“…Before describing the results obtained, the reader is referred to previous studies where the corrosion products were analyzed in the same systems after 24 and 48 h in NaCl solution . In this work a detailed corrosion product analysis is performed as a function of the immersion time in solution and locally at the cut edge of the three different galvanized steel systems.…”

Section: Resultsmentioning

confidence: 99%

“…Aluminum contents of up to 4–5% weight in the metal coating show an enhanced surface corrosion resistance versus the classical zinc galvanized steel products . However, failure at the cut edge was detected in different tests such as exposure to chloride solutions , accelerated corrosion tests , and field exposure .…”

Section: Introductionmentioning

confidence: 99%

“…Cut edge corrosion has been often studied by local electrochemical techniques namely, scanning vibrating electrode technique (SVET) , micropotentiometry , localized electrochemical impedance , and scanning electrochemical microscopy (SECM) . Some of the mentioned studies support the electrochemical data with the corrosion product analysis . Painted and unpainted galvanized steel were used as the base material in all these references.…”

Section: Introductionmentioning

confidence: 99%

“…In this framework, three painted metal‐coated steel samples each with different aluminum content in the metal coating were polished and embedded in order to expose the cross‐section to the electrolyte. In previous studies performed by the authors the characterization of corrosion products was performed as a validation and complement of different electrochemical studies . However, this work aims at performing a detailed analysis and review of the different corrosion products that are formed during the first stages of corrosion at the cut edge.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion product identification at the cut edge of aluminum-rich metal-coated steel

Alvarez-Pampliega

Bergh

Strycker

et al. 2014

Materials and Corrosion

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The formation of corrosion product at the cut edge of aluminum-rich metalcoated steel is reported in the present work. Painted metal-coated steel samples with different amounts of Al in the metal coating, were immersed in a 0.05 M NaCl solution. The ex situ analysis of the corrosion products formed was carried out by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX), Raman and Fourier transform infrared (FT-IR) spectroscopy. The role of these products is discussed along with the influence of Al content in the metal coating. Figure 4. EDX mappings comparison between (a) hot dip Al-Zn steel immersed 2 h in 0.05 M NaCl and (b) 40 h www.matcorr.com

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion product identification at the cut edge of aluminum-rich metal-coated steel

Alvarez-Pampliega

Bergh

Strycker

et al. 2014

Materials and Corrosion

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“…The localized corrosion activity occurring over a commercial grade HDG surface immersed in aqueous sodium chloride electrolyte has been mapped using in situ SVET, which has been widely used in previous corrosion studies. [13][14][15][16][17][18][19][20][21][22] The effect of concentration and pH on corrosion inhibition by H 2 PP and an inorganic inhibitor, namely sodium phosphate (Na 3 PO 4 ), are assessed. A pH of 11.5 has been chosen to mimic the underfilm conditions found in a corrosion-driven delamination cell.…”

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confidence: 99%

Inhibition of Localized Corrosion of Hot Dip Galvanized Steel by Phenylphosphonic Acid

Glover

Williams

2017

J. Electrochem. Soc.

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Phenylphosphonic acid (H 2 PP) is investigated as a corrosion inhibitor of hot dip galvanized steel (HDG) fully immersed in a 5% (w/v) sodium chloride electrolyte. An in-situ Scanning Vibrating Electrode Technique (SVET) is used where concentrations of H 2 PP are systematically added to the electrolyte in neutral conditions. H 2 PP, at a concentration of 5 × 10 −2 mol dm −3 , is shown to effectively inhibit localized corrosion over a 24 h period with 96% efficiency. H 2 PP is compared with a sodium phosphate (Na 3 PO 4 ) inhibitor at the same concentration over a wide pH range. With current legislative pressure to eliminate Cr(vi)-based inhibitors from protective coating formulations, there is a pressing need to identify effective, environmentally-friendly alternatives. Chromatefree passivation treatments have been studied extensively 1-4 and the most widely used alternative to chromate is a phosphate passivating treatment. Such a system facilitates the precipitation of protective zinc compounds via the supply of soluble anions that react with the zinc ions generated in metal dissolution.5 A phosphate passivation treatment generates a Zn 3 (PO 4 ) 2 barrier to inhibit the anodic process, 4,5 the formation of which can act to extend the pH stability of the surface layer down to values of around pH 6. However, as zinc phosphates are 1000 times more soluble than Cr (III), inferior corrosion inhibition performance is observed. 7 The corrosion of a zinc surface generates a wide range of pH zones, whether in bulk electrolyte conditions, atmospheric conditions or, most notably, under a water droplet. 8,9 Corrosion-driven cathodic coating delamination phenomena produces an alkaline underfilm environment where values of pH 10-11.5 have been recorded previously on a coated zinc surface. 10In order to compete with an adsorbed chromium (III) oxide layer, an effective corrosion inhibitor system would have to be stable in a range of pH 4-14.7 It is therefore of great importance to examine potential chromate replacement inhibitors in non-neutral conditions.In a recent Scanning Kelvin probe study, we showed that in-coating additions of H 2 PP increased the initiation time for underfilm cathodic coating delamination by up to 20 h and reduced the delamination rate by up to 94% on hot dip galvanized steel (HDG) surfaces.11 An 'etch' effect was shown to be the dominant inhibition mechanism, whereby a reaction occurs at the point of first contact of the wet coating with the substrate producing an interfacial metal phosphate salt layer. We hypothesize that a second mode of inhibition occurs whereby the leaching of dissociated PP 2− ions from the coating into the substrate/coating interface forms a ZnPP layer, blocking the anodic reaction. H 2 PP has been shown previously to strongly adsorb onto surface oxide films, disfavoring chloride.12 The principal aim of this work is to determine the efficiency of H 2 PP as an inhibitor for HDG surfaces in bulk immersion conditions. The localized corrosion activity occurring over a commercial gr...

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Comparison of the in vitro corrosion behavior of biodegradable pure Zn in SBF, 0.9% NaCl, and DMEM

Zhu

Guo

Yang

et al. 2021

Materials & Corrosion

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Zn‐based alloys are considered to be the new biodegradable implant materials due to their suitable degradation rate and good biocompatibility. The biocorrosion behavior of pure Zn in 0.9% NaCl, simulated body fluid, and Dulbecco's modified Eagle's medium (DMEM) was investigated by electrochemical and immersion tests. These tests revealed that pure Zn has the lowest corrosion rate in DMEM and the highest in 0.9% NaCl. Aggressive Cl− has an important effect on the corrosion process. Buffering agents, amino acids, and glucose have a close connection with corrosion resistance. Among the three solutions, DMEM with a similar ion concentration and necessary nutriments is recommended as the more suitable choice for estimating biodegradable alloys' in vitro degradation.

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Study of local Na+ and Cl− distributions during the cut-edge corrosion of aluminum rich metal-coated steel by scanning vibrating electrode and micro-potentiometric techniques

Cited by 28 publications

References 57 publications

Corrosion product identification at the cut edge of aluminum-rich metal-coated steel

Corrosion product identification at the cut edge of aluminum-rich metal-coated steel

Inhibition of Localized Corrosion of Hot Dip Galvanized Steel by Phenylphosphonic Acid

Comparison of the in vitro corrosion behavior of biodegradable pure Zn in SBF, 0.9% NaCl, and DMEM

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