Optical and structural properties of cost-effective nanostructured calcium titanate blue phosphor

Yadav, P. J.; Rao, R. Prasada; Azeem, P. Abdul

doi:10.1016/j.ceramint.2022.10.154

Cited by 5 publications

(1 citation statement)

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“…They are separated into three doublets. The first peak of Ca2p 3/2 , positioned at 346.1 eV, corresponds to Ca(OH) 2 [53], which is a product of the chemical interactions taking place on the surface (reaction 2). The second peak, positioned at 347.3 eV, corresponds to the presence of insoluble corrosion-protective Ca 10 PO 46 (OH) 2 [54,55], also a product of reaction (3), and the third one-to Ca(NO 3 ) 2 [56], which is an element of the precursor system.…”

Section: Xps Of As-deposited Samplesmentioning

confidence: 99%

Influence of the Chemical Composition of Ceria Conversion Coatings, Sealed in Solution of NaH2PO4 and Ca(NO3)2, on the Corrosion Behavior of Aluminum

Tsanev,

Andreeva,

Stoychev

2023

Materials

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The corrosion-protective influence of eco-friendly ceria conversion coatings deposited on Al-1050 alloy, additionally treated in mixed NaH2PO4 and Ca(NO3)2 solution, was studied. The main aim of this work was to investigate how the obtained mixed systems of coatings eliminates the negative role of cracks and pores on the surface formed after deposition only of ceria coating. For this purpose, the growth structure, main components and corrosion resistance of the so formed protective systems were investigated by SEM, EDS, XRD, XPS and electrochemical (PDP, Rp, etc.) methods. The results obtained show that the basic components of the conversion layers (before and after exposure in model corrosion media) are characterized by Al2O3, Al(OH)3, CePO4 and Ca5(PO4)3(OH). Based on these results, the optimal conditions of immersion treatment(s) of Al substrate are established. At these regimes, the relationship of co-deposited Ce3+, PO43+ and Ca2+-containing components of the conversion layers determine the maximum values of their polarization resistance—a basic criterion for corrosion protection of Al. This effect is related to the formation of fill out of the defects of the conversion coatings and additional Ca5(PO4)3(OH), CePO4 AlPO4 and Al(OH)3 deposits, leading to the decrease of the corrosion rate.

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