Development of sol–gel alumina coating on 9Cr–1Mo ferritic steel and their oxidation behavior at high temperature

Singh, Iqbal; Modi, O. P.; Ruhi, Gazala

doi:10.1007/s10971-015-3649-9

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…Based on Yoldas process [28], boehmite gel was synthesized using aluminum isopropoxide and double-distilled water in their 1:100 molar ratio. Details of synthesis of boehmite are available elsewhere [29,30]. After drying, it was calcined in muffle furnace for 1 h at 500°C.…”

Section: Methodsmentioning

confidence: 99%

Sol–gel synthesis of nanoparticles of gamma alumina and their application in defluoridation of water

Singh

Gupta

Dubey

et al. 2015

J Sol-Gel Sci Technol

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Water solvent-based sol-gel process was employed in the synthesis of nanoparticles of gamma alumina (NPGA) which were used for the removal of fluoride from water of neutral pH. Different techniques like thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron microscopy were employed for the characterization of the synthesized particles. Batch adsorption studies were performed for the optimization of contact time and adsorbent doses to obtain maximum fluoride removal and understanding of the adsorption kinetics and mechanism. The maximum adsorption capacity of NPGA for fluoride removal was estimated to be nearly 14 mg/g at room temperature (30°C) which is better than fluoride removal reported by earlier using of commercialgrade NPGA. Adsorption kinetics measurement indicated that Langmuir equilibrium model is found to be more suitable for describing the fluoride adsorption mechanism. Graphical Abstract

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Section: Methodsmentioning

confidence: 99%

Sol–gel synthesis of nanoparticles of gamma alumina and their application in defluoridation of water

Singh

Gupta

Dubey

et al. 2015

J Sol-Gel Sci Technol

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“…• Ultrasonic cleaning with acetone, isopropanol, ethanol, or special detergents (Truyen et al 2006) • Polishing of metals to obtain a smooth and definite surface allowing, e.g., detailed studies of diffusion of ions from substrates into the alumina coating (e.g., Velez and Quinson 2000) • Grinding (e.g., Wang and Zeng 2010), shot peening (Ruhi et al 2006), or sand blasting (Zhu et al 2006) of metals to yield a surface with defined roughness which could support the adhesion of the coating • Roughening by treatment with hot nitric acid (Singh et al 2015a) • The anodic oxidation of aluminum (Zemanová et al 1996) • Plasma etching leading to activation and cleaning of the metallic substrate surfaces (Pandey et al 2012;Pietrzyk et al 2013a, b), thus obtaining an excellent wetting by aqueous sols • Phosphating which could improve the adhesion of alumina layers on steel (Ruhi et al 2006) • Preoxidation to create a surface with a grainy morphology which is beneficial for the adhesion of the alumina coating (Cebollada and Garcia-Bordejé 2009) Deposition of Sols…”

Section: Substrate Pretreatmentsmentioning

confidence: 99%

Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

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This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

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“…[27] The general techniques used for alumina coating on carbon steels are physical vapour deposition, chemical vapour deposition (CVD), sol-gel, plasma electrolytic oxidation, thermal spray, and pack cementation. [27][28][29][30][31][32][33][34][35][36][37][38] In the present work, a fluidizationbased CVD process is employed owing to its ability to achieve simultaneous deposition of alumina on inner and outer surfaces of a tubular carbon steel substrate. Fluidized bed sublimation and induction heating are employed to optimize precursor inventory.…”

Section: Introductionmentioning

confidence: 99%

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

et al. 2022

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The degradation of carbon steels due to corrosion and gaseous permeation phenomena can be significantly reduced by a thin alumina coating. Tubular carbon steel structures, commonly employed in nuclear establishments are particularly vulnerable to chemical degradation on the inner surface due to the flow of corrosive fluids. In the present work, a fluidization-based chemical vapour deposition process is applied as a one-step solution for simultaneous chemical passivation of both inner and outer substrate surfaces meanwhile optimizing precursor inventory by utilizing fluidized bed sublimation and induction heating techniques. The process is studied by using a 2D-1D mathematical model, which has been validated with experimental results for different carbon steel grades. It was observed that there exists an optimum fluidization velocity for a specified initial mass fraction of precursor powder at which mass of alumina deposited per unit mass of precursor sublimated is maximized.

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Development of sol–gel alumina coating on 9Cr–1Mo ferritic steel and their oxidation behavior at high temperature

Cited by 13 publications

References 27 publications

Sol–gel synthesis of nanoparticles of gamma alumina and their application in defluoridation of water

Sol–gel synthesis of nanoparticles of gamma alumina and their application in defluoridation of water

Alumina Thin Films

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

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