The effect of an artificially synthesized simonkolleite layer on the corrosion of electrogalvanized steel

Yoo, J.D.; Volovitch, P.; Aal, A. Abdel; Allély, C.; Ogle, K.

doi:10.1016/j.corsci.2012.10.024

Cited by 54 publications

(41 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…X‐ray diffraction analysis of the samples after 17 hours of various cathodic polarizations (7 hours for the −1.05 V sample) is presented in Figure . Simonkolleite reflections can only be found after polarization at −1.05 V, confirming thereby the Raman microscopy results ,. For the other potentials, ZnO is the main crystalline structure (besides that of the zinc substrate).…”

Section: Resultssupporting

confidence: 81%

Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions

et al. 2018

View full text Add to dashboard Cite

Zinc electrodes were polarized cathodically at moderate overpotentials in NaCl 0.6 M solutions under potentiostatic conditions for 7 to 17 hours at room temperature. Corrosion products were characterized by using optical microscopy, XRD, Raman microscopy, XPS, and FIB-SEM. Close to the open-circuit potential, the corrosion products were formed by simonkolleite and the electrochemical response exhibits anodic features. At more negative potentials, the current density remains cathodic throughout the polarization and the deposits on the electrode surface consist almost solely of ZnO. The soluble zinc species necessary for ZnO deposition originate from localized dissolution of the substrate in the form of pits. This effect is assigned to the strong alkalinization of the surface due to oxygen reduction. Despite developing greater surface area than bare zinc substrates, the nanostructured ZnO deposits reduced the cathodic activity.[a] Dr.

show abstract

Section: Resultssupporting

confidence: 81%

Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Under this immersion condition, the protective layer is constituted by hydrozincite and magnesium carbonates (MgCO 3 and Mg 3 (CO 3 ) 4 (OH) 2 ). Moreover, it was confirmed that the presence of chlorides in the electrolyte was not hindering the formation of a protective layer, in accordance with the work of Yoo et al for atmospheric exposure conditions . The work of Rodriguez et al highlighted that Mg dissolution in neutral non‐buffered solutions involves a rapid alkalinization of the electrolyte .…”

Section: Introductionsupporting

confidence: 78%

Corrosion protection by zinc‐magnesium coatings on steel studied by electrochemical methods

Andreatta¹,

Rodriguez

Mouanga

et al. 2018

Materials & Corrosion

View full text Add to dashboard Cite

The mechanism of corrosion protection of zinc‐magnesium coatings on steel is investigated in this work in order to understand if each layer of the metallic coating is able to provide galvanic protection to the underlying layer and to the steel substrate. Thus, the electrochemical behavior of the metallic coating is studied as a function of the in‐depth structure and composition. The microstructure of each layer is analyzed using the scanning electron microscopy in combination with energy dispersive X‐ray spectroscopy (SEM/EDXS). The electrochemical characterization is carried out by means of electrochemical micro‐cell and scanning vibrating electrode technique (SVET). The corrosion protection mechanism of Zn‐Mg metallic coatings is based on the galvanic protection provided by the Zn‐Mg and Zn layers to the steel substrate. Preferential Mg dissolution in the metallic coating plays an important role in the protection mechanism. Local alkalinization at cathodic sites favors the precipitation of protective Mg‐rich oxides/hydroxides that reinforce the protective corrosion products and therefore could inhibit corrosion processes on the metallic coating and steel substrate.

show abstract

“…This observation was attributed to the precipitation of solid ZnCO 3 in absence of any aggressive ions. Even though well studied individually, only few studies address the effect of the combined electrolyte system containing both chloride and carbonate in different concentrations [11,[16][17][18][19]. In this regard, it was reported that already low chloride contents prevent passivation.…”

Section: Introductionmentioning

confidence: 94%

“…In particular, the protective character of zinc hydroxy carbonate precipitates is controversial [11,16,19,[21][22][23][24], however, this may also depend on the experimental conditions. Thus, the presence of specific corrosion products and their influence on reactivity and change in corrosion behaviour was subject of recent publications [17][18][19]25]. Accordingly, the effect of carbonate ions in nearneutral pH is critical for zinc corrosion in general.…”

Section: Introductionmentioning

confidence: 97%