Relationship between La and Ce additions on microstructure and corrosion resistance of hot-dip galvanized steel

Fan, Hongzhen; Xu, Wencan; Liang, Wei; Liu, Yubao; Li, Qian

doi:10.1007/s42243-020-00482-1

Cited by 16 publications

(7 citation statements)

References 37 publications

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“…RE elements have a strong mutual chemical affinity to [O] and [S] [ 40 ]. Both elements begin to aggregate and form high melting point oxides, oxysulfides and sulfides, thus having the ability to remove the deleterious types of inclusions that are formed [ 13 , 32 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

“…( Combining Table 3 [40]. Both elements begin to aggregate and form high melting point oxides, oxysulfides and sulfides, thus having the ability to remove the deleterious types of inclusions that are formed [13,32,41] to change the inclusion morphology from chains and strips to generate CeAlO3, Ce2O2S, and Ce2O3 spherical inclusions [42].…”

Section: Ce Inclusions Formed Thermodynamic Mechanismsmentioning

confidence: 99%

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Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Zhi

Zhang

et al. 2021

Materials

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The effects of Cerium (Ce) were studied on the casting slab quality, microstructure, and inclusion evolution of cryogenic vessel steel. An optical metallographic microscope, scanning electron microscope, energy dispersive spectrometer, and Thermo-calc thermodynamic software were used for characterization and analysis. The results indicated that the central segregation was significantly improved after adding Ce and reached the lowest level when the content of Ce was 0.0009 wt.%. Meanwhile, the presence of Ce reduces the size of ferrite and improves pearlite morphology. Ce also enables the modification of Al2O3 and MnS + Ti4C2S2 inclusions into ellipsoid CeAlO3 and spherical Ce2O2S + Ti4C2S2 composite inclusions, respectively, which are easier to remove. The formed Ce2O2S inclusions are fine and can work as heterogeneous nucleation points to refine the microstructure of steel.

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Section: Resultsmentioning

confidence: 99%

Section: Ce Inclusions Formed Thermodynamic Mechanismsmentioning

confidence: 99%

Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Zhi

Zhang

et al. 2021

Materials

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“…Так, процесс в случае сплавов «Galvalume» в хлоридной среде начинается на богатых цинком участках поверхности. Происходит преимущественное растворение Zn из междендритных областей, при этом фаза, обогащенная Al, имеет более положительный потенциал и ускоряет коррозию покрытия, действуя как катод [18] В работах [34][35][36][37] исследовали влияние небольших (0.05-0.1 масс. %) добавок редкоземельных металлов (РЗМ) на коррозионную стойкость «горячих» цинковых покрытий, основу которых составляют сплавы Zn-Al (5 масс.…”

Section: коррозия сплавных покрытий на основе Zn-al и Zn-mgunclassified

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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“…Steel is prone to electrochemical corrosion in different environments, resulting in its functional failure [1,2]. Hot-dip galvanising is an effective method to enhance corrosion resistance and prolong the service life of steel [3][4][5][6][7]. Galfan coating (Zn-5%Al) has been widely used in high-strength steel wires due to its excellent corrosion resistance, high formability, lightweight, and low cost [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Er addition and cooling rate on the corrosion resistance of Zn-5Al alloys

Huang

Liang

et al. 2023

Materials Science and Technology

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Galfan (Zn-5Al-RE) coating is widely used in high-strength steel wires. The effects of cooling rate and the adulteration of erbium (Er) on the microstructure and corrosion resistance of Zn-5Al alloys were investigated in this study. The results show that the Zn-5Al alloy is made up of the primary η-Zn phase and eutectic structure at a high cooling rate. As the cooling rate decreases, the corrosion current firstly increased and then decreased due to decrease of the primary η-Zn content, the appearance and grew of α-Al phase. Moreover, the addition of Er leads to the formation of Er-containing intermetallic compounds in the Zn-5Al alloy, reducing the size of the primary η-Zn and α-Al phase, decreasing the corrosion current density, and improving the density and compactness of the corrosion product.

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Relationship between La and Ce additions on microstructure and corrosion resistance of hot-dip galvanized steel

Cited by 16 publications

References 37 publications

Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

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

Effects of Er addition and cooling rate on the corrosion resistance of Zn-5Al alloys

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