Analysis of Initial Oxide Films Formed on Zinc and Zinc-Iron Alloy Coatings

Sagiyama, Masaru; Hiraya, Akira

doi:10.3323/jcorr1991.42.721

Cited by 4 publications

(6 citation statements)

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“…Iron−zinc alloy electrodeposition has been attempted successfully in the past and has been studied by various techniques. − Zinc galvanization has been used for many years to provide a sacrificial anode for steel used in applications such as the protection of car bodies. Bearing in mind the widespread use of galvanization, and especially the economic impact of the automobile industry, it is clearly important to try to develop more effective methods of corrosion protection.…”

Section: Introductionmentioning

confidence: 99%

“…One such method may be the production of an alloy that will protect against the corrosive effects of the environment (such as the effects of deicing salts and moist air) even when it becomes dented or scratched. Iron−zinc alloys have shown promise in corrosion protection in previous studies, − and a study of these alloys is undertaken here to promote a better understanding of the corrosion-resistant properties afforded by the alloys.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Corrosion Behavior of Electroplated Iron−Zinc Alloys Using X-ray Photoelectron Spectroscopy

Hixson

Sherwood

2001

J. Phys. Chem. B

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The corrosive behavior of iron-zinc alloys that have been electroplated on mild steel in both aerated and deaerated quadruply distilled water has been studied using core and valence band X-ray photoelectron spectroscopy. Three alloys were electroplated for comparative purposes with a 17%, 41%, and 83% iron composition. Three alloys of each type were either left untreated or exposed to either detreated or aerated water. No oxidation above that for the untreated samples was found for the samples immersed in deaerated water. As expected, the 83% iron alloy was oxidized in aerated water. However, the 17% iron alloy showed decreased oxidation in aerated water with respect to the untreated alloy. The 41% iron alloy in deaerated water showed no increased oxidation above that of the untreated sample, but it did show increased oxidation in aerated water. The valence band region proved valuable for diagnostic purposes, and had features that could be understood by comparing the experimental data with spectra calculated from band structure calculations. The 17% iron alloy forms a protective zinc oxide surface, while the 41% iron alloy forms a much less protective iron-zinc spinel (Fe 2 ZnO 4 ). The iron-rich alloy forms an unprotective FeOOH surface layer. † Part of the special issue "John T. Yates, Jr. Festschrift".

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Corrosion Behavior of Electroplated Iron−Zinc Alloys Using X-ray Photoelectron Spectroscopy

Hixson

Sherwood

2001

J. Phys. Chem. B

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“…A feature of the corrosion of iron-zinc coatings FeZn and zinc alloys in general is the selective dissolution of zinc as a more electronegative metal. In a number of works [24,25], it is noted that selective dissolution can have a positive effect on the anticorrosion properties of a film of corrosion products, in particular, due to the formation of a microheterogeneous rough surface, which is convenient for the nucleation of numerous crystallization centers, or due to the enrichment of the film with a more noble metal.…”

Section: Discussionmentioning

confidence: 99%

“…In [24], the authors point to the formation of a dense deposit, which slows down the ionic conductivity. It was shown in [25] that a film of corrosion products with 7 wt.% Fe suppresses the oxygen reduction reaction due to its low electrical conductivity. In addition, in [27,28], it was assumed that the effect of iron is reduced to the amorphization of the deposit of corrosion products, an increase in its compactness and a decrease in porosity.…”

Section: Discussionmentioning

confidence: 99%

Corrosion of diffusion zinc coatings in sodium chloride solutions

et al. 2022

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Diffusion galvanizing is widely used in the pipe industry for coating the threaded surface of pipe couplings, protecting water and gas pipelines, and other metal products. Diffusion coatings have a number of advantages over other types of zinc coatings. In this work, electrochemical and gravimetric methods are used to study the corrosion behavior of diffusion zinc coatings in sodium chloride solutions. The corrosion rate depends non-linearly on the thickness of the coating. At the initial stages, the corrosion rate of coatings depends on the structure of the phases on the surface, and with an increase in the holding time, the corrosion rate depends to a greater extent on the properties of the products formed during the corrosion process. Films of corrosion products of diffusion zinc coatings consist of zinc oxide/hydroxide and basic zinc salts, while the composition of the film changes with increasing coating thickness.

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“…Увеличение содержания Fe выше 20 масс. % приводит к ускорению коррозии, а наиболее замедленным по данным [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] процесс является при концентрации железа 10 масс. %.…”

Section: коррозия сплавных покрытий на основе Zn-feunclassified

Features of the corrosion of coatings based on zinc alloys: oxidation products and the selective dissolution of zinc. Review

Biryukov,

Kozaderov,

Batmanova

2024

kcmf

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The literature review analyses and systematizes the results of corrosion studies of widely used anti-corrosion zinc coatings based on various binary systems Zn-Al, Zn-Mg, Zn-Fe, Zn-Ni, Zn-Co. The patterns of corrosion, the role of selective dissolution and corrosion products in increasing the corrosion resistance of coatings in neutral chloride-containing environments have been studied. The analysis shows that the corrosion rate depends on the chemical and phase composition of zinc coatings, which is due to differences in the corrosion behavior of the phase components of the alloys. Selective dissolution has an ambiguous effect on the corrosion resistance of coatings. On the one hand, the process of selective dissolution of zinc can be accompanied by the formation of corrosion cracks, which reduces the corrosion resistance of thecoating. On the other hand, a rough surface enriched with an electropositive alloying component is formed. As a result, roughness stimulates the deposition of a denser and more compact layer of corrosion products, which reduces the access of oxygen and other electrolyte components to the coating’s surface. Under certain conditions, a film of corrosion products can provide additional resistance to the corrosion process due to low electrical conductivity. With the uniform dissolution of coatings, both the co-precipitation of complex compounds of zinc and alloying metals and the doping of the product layer with oxides or hydroxides of alloying metals occur. This also results in increased compactness and reduced electrical conductivity, which increases the corrosion resistance of the coatings. The purpose of the article: an overview of the resultsof studies of corrosion of zinc coatings, physical and chemical features of the formation and composition of the layer of corrosion products, the influence of corrosion products and selective dissolution on the corrosion resistance of coatings. A review of the results of studies relating to the corrosion of zinc coatings was carried out, taking into account the formation of a protective layer of corrosion products and the selective dissolution of zinc. The corrosion of zinc coatings is influenced by the structure and phase composition of the coatings, the selective dissolution of zinc, as well as the nature of the layer of corrosion products. The corrosion resistance of zinc coatings increases if a compact layer of corrosion products with low electrical conductivity is formed. The selective dissolution of zinc can have a positive effect on its protective ability due to the formation of a rough surface, which promotes the deposition of a denser layer of corrosion products. In the case of theuniform dissolution of zinc alloy coatings, alloying metals are able to integrate into the structure of zinc corrosion products, which makes the layer more compact and leads to a decrease in its electrical conductivity, significantly increasing the corrosion resistance of the coatings

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Analysis of Initial Oxide Films Formed on Zinc and Zinc-Iron Alloy Coatings

Cited by 4 publications

References 0 publications

Study of the Corrosion Behavior of Electroplated Iron−Zinc Alloys Using X-ray Photoelectron Spectroscopy

Study of the Corrosion Behavior of Electroplated Iron−Zinc Alloys Using X-ray Photoelectron Spectroscopy

Corrosion of diffusion zinc coatings in sodium chloride solutions

Features of the corrosion of coatings based on zinc alloys: oxidation products and the selective dissolution of zinc. Review

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