Zirconium-based conversion coating modified by different amount of chitosan on hot-dip Zn-Al alloy coated steel sheet

Pan, Jie; Ding, Ya-jing; Zhao, Rui-cheng; Zhang, Jian; Li, Yan

doi:10.1016/j.corcom.2023.01.004

Corrosion Communications

2023

DOI: 10.1016/j.corcom.2023.01.004

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Zirconium-based conversion coating modified by different amount of chitosan on hot-dip Zn-Al alloy coated steel sheet

Jie Pan,

Ya-jing Ding,

Rui-cheng Zhao

et al.

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2024

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Cited by 5 publications

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Effect of Surface Pretreatments on the Formation of Zr‐Based Conversion Layers on Zn–Al–Mg Alloy‐Coated Steel

Ponomareva,

Duchoslav,

Stifter

et al. 2024

Materials & Corrosion

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Zr‐based conversion coatings represent an environmentally conscious alternative to traditional phosphating and chromating in the automotive industry. In this study, we employ XPS and LEIS to investigate the formation of Zr‐conversion layers on Zn–Mg–Al alloy after alkaline and acidic model pretreatments. On alkaline pretreated surfaces, a Zr‐oxide/oxyfluoride layer and an underlying Mg–Al–fluoride layer are formed, whereas acidic pretreatment results in only an oxidic layer. The thickness of the Zr‐layer depends on pretreatment pH and immersion time. Acidic treatment achieves an approximately 23 nm‐thick Zr‐oxide/oxyfluoride layer after 1 min, while prolonged treatment increases the thickness of the oxidic layer for strong alkaline and acidic conditions. Mild alkaline pretreatments, however, do not benefit from extended immersion. F‐induced corrosion pits are observed after mild alkaline treatment. The strong alkaline pretreatment proved to be the most efficient in creating a double‐layered Zr‐conversion coating with increased oxidic layer thickness over time.

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Effect of Surface Pretreatments on the Formation of Zr‐Based Conversion Layers on Zn–Al–Mg Alloy‐Coated Steel

Ponomareva,

Duchoslav,

Stifter

et al. 2024

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

Microstructure of Batch Hot-Dip Zn-5 Wt Pct Al Coatings: Comparison of Ball-Milling Pretreatment and Conventional Pretreatment

Li,

Zhou,

Zhou

et al. 2024

Metall Mater Trans A

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Enhanced high-temperature corrosion resistance of Cr-modified phosphate/aluminum powder composite coatings: Mechanisms and thermodynamic insights

Wang,

Chen,

Wang

et al. 2024

Chemical Engineering Journal

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Zirconium-based conversion coating modified by different amount of chitosan on hot-dip Zn-Al alloy coated steel sheet

Cited by 5 publications

References 48 publications

Effect of Surface Pretreatments on the Formation of Zr‐Based Conversion Layers on Zn–Al–Mg Alloy‐Coated Steel

Effect of Surface Pretreatments on the Formation of Zr‐Based Conversion Layers on Zn–Al–Mg Alloy‐Coated Steel

Microstructure of Batch Hot-Dip Zn-5 Wt Pct Al Coatings: Comparison of Ball-Milling Pretreatment and Conventional Pretreatment

Enhanced high-temperature corrosion resistance of Cr-modified phosphate/aluminum powder composite coatings: Mechanisms and thermodynamic insights

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