Enhanced phosphatability by decorating ferrite layer on the surface of a multi-phase steel

Kim, Dong-Hyun; Park, Joongchul; Joe, Jae-Dong; Jung, Yonggyun; Song, Yon-Kyun; Lee, Jaesang; Heo, Yoon-Uk

doi:10.1016/j.matchar.2022.112373

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Various studies have been conducted on the phosphatability of steel. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] These studies encompass investigations into factors such as the effect of surface silicon and manganese oxides, [9,11] the impact of surface carbon content, [19] and the effects of heat treatment. [21] The effect of tramp elements on the phosphatase activity was also explored.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Segregation of Tin on the Phosphatability of Cold‐Rolled Steel Sheets

Park,

Kim,

Lee

et al. 2024

steel research int.

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The increasing use of iron scrap to reduce greenhouse gas emissions results in the enrichment of steel with the tramp element Sn. However, the effect of Sn on phosphatase activity remains unclear. Therefore, this study aims to investigate the effect of the Sn content on the phosphatase activity of cold‐rolled steel plates. The phosphatability of the cold‐rolled steel sheets is evaluated by adding several tens of ppm of Sn. The surface characteristics of the materials are analyzed using X‐Ray photoelectron spectroscopy and transmission electron microscopy. Additionally, the reactivities of the materials in the phosphate treatment solution are assessed using an electrochemical evaluation method. Notably, a significant decrease in phosphatase activity is observed, which is attributed to the inhibition of the phosphate reaction by the Sn oxide layers formed on the steel sheet surface, with a layer thickness of a few nanometers. These Sn surface oxides can be removed by pickling with HCl, and the initial phosphate reaction occurs rapidly in areas where the oxides are removed.

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Section: Introductionmentioning

confidence: 99%

Influence of Surface Segregation of Tin on the Phosphatability of Cold‐Rolled Steel Sheets

Park,

Kim,

Lee

et al. 2024

steel research int.

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“…The multi-phase steels are composed of diverse phases, including α-ferrite, α b -bainite, α′-martensite, pearlite, and retained austenite (γ) (Han et al 2021;Kim et al 2022a). Among them, γ controls the mechanical properties in the multi-phase steels.…”

Section: Introductionmentioning

confidence: 99%

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

et al. 2022

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An electron probe X-ray microanalyzer (EPMA) is an essential tool for studying chemical composition distribution in the microstructure. Quantifying chemical composition using standard specimens is commonly used to determine the composition of individual phases. However, the local difference in chemical composition in the standard specimens brings the deviation of the quantified composition from the actual one. This study introduces how to overcome the error of quantification in EPMA in the practical aspect. The obtained results are applied to evaluate the chemical composition of retained austenite in multi-phase steel. Film-type austenite shows higher carbon content than blocky-type one. The measured carbon contents of the retained austenite show good coherency with the calculated value from the X-ray diffraction.

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Study on corrosion resistance of passive sealant to Fe-based amorphous coating at atomic-scale

Wang,

Zhou,

Zhang

et al. 2023

Construction and Building Materials

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Enhanced phosphatability by decorating ferrite layer on the surface of a multi-phase steel

Cited by 6 publications

References 18 publications

Influence of Surface Segregation of Tin on the Phosphatability of Cold‐Rolled Steel Sheets

Influence of Surface Segregation of Tin on the Phosphatability of Cold‐Rolled Steel Sheets

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

Study on corrosion resistance of passive sealant to Fe-based amorphous coating at atomic-scale

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