Relation between corrosion resistance and corrosion products for electrogalvanized steel.

Sakoda, Akito; Usuki, Noriaki; Wakano, Shigeru; Nishihara, Minoru

doi:10.4139/sfj.40.164

Cited by 18 publications

(6 citation statements)

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“…However, the corrosion products of the other three coatings are agglomerate in morphology and are randomly connected. In addition, several studies have shown that simonkolleite is a protective corrosion product for a steel substrate as it is preferably oriented to form a compact and adhesive layer that hinders the diffusion of oxygen [44][45][46][47]. The sheet-like simonkolleite performs better than the agglomerate product in improving anti-corrosion ability.…”

Section: Sem and Xrd Analysismentioning

confidence: 99%

Improving the performance of zinc-rich coatings using conductive pigments and silane

De-ming

Huang

Xiao

et al. 2020

Corrosion Engineering, Science and Technology

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By analysing the results of corrosion potential, EIS, SEM and XRD test of zinc-rich coatings (ZRCs) in 3.5wt-% NaCl solution, it was found that conductive pigment (di-iron phosphide, Fe 2 P) can accelerate the activation and corrosion rate of zinc powders in ZRCs, but too fast corrosion rate can reduce the cathodic protection and shielding of ZRCs. Silane improves the mechanical properties and shielding effect of coatings, but reduces the activation and corrosion rate of zinc powders. The synergy effect of the two strengthens both the cathodic protection and the shielding effect. Finally, the synergy mechanism of Fe 2 P and silane to improve the performance of ZRCs is proposed. These mechanisms provide references for solving the galvanic corrosion of conductive fillers (Fe 2 P, graphite, carbon black, carbon nanotubes, graphene, etc.) in ZRCs.

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Section: Sem and Xrd Analysismentioning

confidence: 99%

Improving the performance of zinc-rich coatings using conductive pigments and silane

De-ming

Huang

Xiao

et al. 2020

Corrosion Engineering, Science and Technology

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“…To suppress the atmospheric corrosion of steels, the steels are frequently galvanized because Zn sacrificially corrodes and protects the steel from corrosion. Also, zinc rusts formed on galvanized steels play an important role in protecting the steels from corrosion and contain various kinds of oxides, hydroxides, and basic zinc salts (BZS). − The corrosion resistance of zinc rusts is explained by the fact that the protecting property of BZS relates to the formation of a disordered layer structure producing adherent films . Also, the chemical composition of BZS strongly depends on the exposure environment of galvanized steel as well as steel rusts. ,,, The zinc hydroxychloride (Zn 5 (OH) 8 Cl 2 ·H 2 O, ZHC) is formed together with ZnO where the galvanized steels are exposed to a marine atmosphere .…”

Section: Introductionmentioning

confidence: 99%

“…Also, zinc rusts formed on galvanized steels play an important role in protecting the steels from corrosion and contain various kinds of oxides, hydroxides, and basic zinc salts (BZS). − The corrosion resistance of zinc rusts is explained by the fact that the protecting property of BZS relates to the formation of a disordered layer structure producing adherent films . Also, the chemical composition of BZS strongly depends on the exposure environment of galvanized steel as well as steel rusts. ,,, The zinc hydroxychloride (Zn 5 (OH) 8 Cl 2 ·H 2 O, ZHC) is formed together with ZnO where the galvanized steels are exposed to a marine atmosphere . The zinc hydroxysulfate (Zn 4 SO 4 (OH) 6 · n H 2 O) and NaZn 4 Cl(OH) 6 SO 4 ·6H 2 O are generated in industrial zones. , The initial zinc rust contains the hydrozincite (Zn 5 (OH) 6 (CO 3 ) 2 ) which is converted to other zinc rusts such as ZHC and NaZn 4 Cl(OH) 6 SO 4 ·6H 2 O after exposure for a long period .…”

Section: Introductionmentioning

confidence: 99%

Simulating Study of Atmospheric Corrosion of Galvanized Steels: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl₂ Solution

Tanaka

Kitazawa

Hatanaka

et al. 2011

Ind. Eng. Chem. Res.

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To simulate the corrosion of galvanized steel in a marine zone, steel rust of β-FeOOH particles was prepared by aerial oxidation of aqueous FeCl 2 solutions containing ZnCl 2 and zinc rusts such as ZnO and zinc hydroxychloride (Zn 5 (OH) 8 Cl 2 3 H 2 O, ZHC). The crystallinity and particle size of β-FeOOH were slightly decreased by adding the ZnCl 2 . The produced particles contained a small amount of ZnCl 2 , while the zinc rusts of ZnO and ZHC markedly impeded the crystallization and particle growth of β-FeOOH. In the presence of a large amount of zinc rusts, the formation of β-FeOOH was suppressed and γ-FeOOH and ZHC of which the particle size was larger than that of β-FeOOH were generated. The inhibitory effect on the formation of β-FeOOH was on order of ZHC ≈ ZnO . ZnCl 2 . The effect of zinc rusts was ascribed to the increment of solution pH by dissolution of rust particles and adsorption of Zn(II) on a precursor of β-FeOOH particles. The adsorption of CO 2 on the products was also suppressed by the addition of ZnCl 2 and zinc rusts. These results imply that the β-FeOOH rust formed on galvanized steel in a marine environment is more compact, leading to improved corrosion resistance. However, existence of a large amount of zinc rust particles inhibits the formation of a compact rust layer and lowers the ability for corrosion resistance.

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“…Umino et al 18 have shown that the high corrosion resistance for the Zn-Co-Cr-Al 2 O 3 coating is due to the formation of an insulating zinc hydroxyl chloride which is a corrosion product supported by Al 2 O 3 . Sakoda et al 19 showed using X-ray diffraction and EPMA (electron probe microanalysis) measurements that the corrosion resistance of the zinc coated steel is due to the low corrosion current density caused by the formation of insulating zinc hydroxyl chloride which acts as a protective corrosion layer. 20 They showed that zinc oxide is formed by excessive corrosion of the zinc layer and suggested that the zinc-ceramic composite has a high corrosion resistance because of the low corrosion current density which may be affected by the microstructure of the protective corrosion products.…”

mentioning

confidence: 99%

Enhanced Hardness and Corrosion Resistance of Zn/SiO₂Films by Electrodeposition

Ghorbani

Salehi

Razavizadeh

2015

J. Electrochem. Soc.

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The electrodeposition of Zn-SiO 2 nanocomposites has been investigated with different electrolytes: triethanolamine as a dispersing agent, and cetyl trimethylammonium bromide and dodecyl dimethylamine oxide as ionic (cationic) and non-ionic surfactants. Appropriate electrophoretic potentials for each solution were obtained using cyclic voltammetry. The results show that the most stable SiO 2 nanoparticles with zeta potential range of 25 to 41 mV, alongwith highest SiO 2 mobility of 0.4 to 0.7 m 2 /V.s were dispersed by triethanolamine in ethanol and the resulting coating adhesion improved up to 5.87 MPa in the standard pull off test, with the enhanced hardness of up to 800 HV. The coating thickness has been seen to increase with increasing potential. The coating morphology investigations reveal three different morphologies for different electrolytes: instantaneous coaxial grain growth for water, hexagonal grain growth for methanol and amorphous structure for ethanol. Corrosion properties of the zinc nanocomposite coatings are discussed where samples with low SiO 2 (<10 wt.%) concentrations are shown to possess higher corrosion resistance than high SiO 2 (>10 wt.%) concentrations.In the last 20 years the interest in electrophoretic deposition (EPD) as a technique to produce advanced materials has widely increased, both in academia and in the industrial sector, and since then a wide range of new applications of EPD for processing a variety of bulk materials and coatings has been reported.

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Relation between corrosion resistance and corrosion products for electrogalvanized steel.

Cited by 18 publications

References 0 publications

Improving the performance of zinc-rich coatings using conductive pigments and silane

Improving the performance of zinc-rich coatings using conductive pigments and silane

Simulating Study of Atmospheric Corrosion of Galvanized Steels: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl₂ Solution

Enhanced Hardness and Corrosion Resistance of Zn/SiO₂Films by Electrodeposition

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Relation between corrosion resistance and corrosion products for electrogalvanized steel.

Cited by 18 publications

References 0 publications

Improving the performance of zinc-rich coatings using conductive pigments and silane

Improving the performance of zinc-rich coatings using conductive pigments and silane

Simulating Study of Atmospheric Corrosion of Galvanized Steels: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl2 Solution

Enhanced Hardness and Corrosion Resistance of Zn/SiO2Films by Electrodeposition

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Simulating Study of Atmospheric Corrosion of Galvanized Steels: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl₂ Solution

Enhanced Hardness and Corrosion Resistance of Zn/SiO₂Films by Electrodeposition