Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel

Tokuda, Setsuko; Muto, Izumi; Sugawara, Yu; Takahashi, Michiyasu; Matsumoto, Masamitsu; Hara, Nobuyoshi

doi:10.1016/j.corsci.2017.07.020

Cited by 22 publications

(11 citation statements)

References 25 publications

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“…This can generate the deposition of corrosion products in the form of Mg‐rich oxides and hydroxides that could have protective properties limiting the corrosion of the coating layers and the steel substrate as well. Moreover, these results suggest also the possible precipitation of Mg carbonates that can also inhibit corrosion processes of the coating …”

Section: Resultsmentioning

confidence: 83%

“…Thus, the formation of oxidation products could be also affected by the presence of magnesium in the metallic coating . Deposition of magnesium oxides/hydroxides and carbonates has been reported at cathodic sites due to preferential magnesium dissolution in the metallic coating . The dissolution reaction of Mg leads to a rapid local alkalinization at the cathodic sites.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the formation of simonkolleite is possible also in the presence of chlorides under atmospheric conditions. The protection mechanism of Mg‐containing Zn coatings has been also investigated under immersion conditions . It has been shown that magnesium delays the formation of zincite for Zn‐Mg‐Al coatings immersed in different electrolytes with pH 9 .…”

Section: Introductionmentioning

confidence: 99%

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

Andreatta¹,

Rodriguez

Mouanga

et al. 2018

Materials & Corrosion

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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.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Andreatta¹,

Rodriguez

Mouanga

et al. 2018

Materials & Corrosion

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“…Figure shows a schematic image of the oxidation mechanism by sacrificial protection. A positive potential promotes diffusion of oxygen and oxidation, while a negative potential prohibits the oxidation of metal or Si and promotes the diffusion of cations such as metal or Si …”

Section: Theorymentioning

confidence: 99%

Oxidation mechanisms of SiC‐fiber–reinforced Si eutectic alloy matrix composites at elevated temperatures

et al. 2019

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SiC‐fiber–reinforced binary Si eutectic alloy composites have been developed for aerospace applications using the melt infiltration method. In this study, the oxidation mechanisms of various binary Si eutectic alloys were evaluated at elevated temperatures. We suggest that the oxidation resistance of eutectic alloys could be predicted using the Gibbs energy change for the oxidation reaction. Based on these calculations, eutectic alloys of Si‐16at%Ti, Si‐17at%Cr, Si‐22at%Co, Si‐38at%Co, and Si‐27at%Fe were prepared. These alloys produced uniform SiO2 layers and showed the same oxidation resistance as Si at 1000°C under humid conditions. Therefore, SiC composites using Si alloys with excellent oxidation resistance can be predicted using thermodynamic calculations.

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“…In recent years, people have tried to add Mg and TiO 2 to Zn-Al coatings for research. The results show that the addition of Mg can significantly improve the corrosion resistance of the coatings [9][10][11]. Caizhen et al studied a Zn-Al-Mg coating prepared by hot dipping and found that the addition of magnesium can not only improve the microhardness of the coating but can also form special corrosion products which can block the passage of oxygen and water and reduce the corrosion rate [12].…”

Section: Introductionmentioning

confidence: 99%

Protective Performance of Zn-Al-Mg-TiO2 Coating Prepared by Cold Spraying on Marine Steel Equipment

Wang

Xiong

et al. 2019

Coatings

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According to research, we have learned that zinc has excellent cathodic protection performance, that the corrosion products of aluminum and magnesium can form dense and stable passivation films to protect internal materials of coatings, and that TiO2 has excellent photocatalytic self-cleaning performance which will form a physical adsorption film on the surface to isolate the external corrosion solution. In this paper, a Zn-Al-Mg-TiO2 pseudo alloy coating was prepared by cold spray technique on a Q235 substrate. The protective performance of Zn-Al-Mg-TiO2 for marine metal equipment was studied using dynamic salt water corrosion testing, electrochemical testing, and friction and wear testing. The microstructure, composition, and wear marks of coatings were observed using a scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and white-light interferometer. The results show that the Zn-Al-Mg-TiO2 coating has excellent corrosion and wear resistance, which can provide long-term and stable protection for the substrate.

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Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel

Cited by 22 publications

References 25 publications

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

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

Oxidation mechanisms of SiC‐fiber–reinforced Si eutectic alloy matrix composites at elevated temperatures

Protective Performance of Zn-Al-Mg-TiO2 Coating Prepared by Cold Spraying on Marine Steel Equipment

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