Effect of forced cooling on the microstructure and properties of Fe-based amorphous composite coatings prepared by laser remelting

Zhao, Wei; Yu, Jiacheng; Hu, Mindong; Hu, Hai; Luo, Junting

doi:10.1016/j.intermet.2022.107552

Cited by 9 publications

(1 citation statement)

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“…To reduce the porosity of coatings, recently, many methods have been proposed, such as optimising preparation processes [8][9][10], laser remelting [11], annealing [12], and sealing treatment [13][14][15][16]. Among these methods, sealing treatment can effectively block the pore defects to enhance the corrosion resistance and thus has gained much attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of inorganic silicate sealing treatment on corrosion behaviour for HVAF sprayed Fe-based amorphous coatings

Ren

Zhang

et al. 2023

Surface Engineering

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Sealing treatment is an effective, environmentally friendly, and economical coating surface modification technology. To clarify the inorganic silicate sealing mechanism and concentration dependence on corrosion behaviour, HVAF-sprayed Fe-based amorphous metallic coatings (AMCs) were sealed by Na 2 SiO 3 solution with various concentrations, and their microstructure, electrochemical performance, and surface chemistry were characterised in detail. The results showed that Na 2 SiO 3 , in the form of a silicon-oxygen bond (Si-O), could effectively bond with the coating surface inside the pore defects. In addition, the optimal concentration was proved to be 1 mol/L, and the corresponding passivation current density could be reduced to (2.38 ± 0.33) × 10 −6 A/cm 2 , which was an order of magnitude lower than that of as-sprayed coating. This was due to the incomplete filling of the sealant at lower concentrations and the release of water vapour at higher concentrations. This work aims to provide guidance for the practical application of silicate sealing treatment.

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