Corrosion Behavior of Chromium Coated Zy-4 Cladding under CANDU Primary Circuit Conditions

Diniasi, Diana; Golgovici, Florentina; Anghel, A.; Fulger, Manuela; Surdu-Bob, Carmen Cristina; Demetrescu, Ioana

doi:10.3390/coatings11111417

Cited by 7 publications

(5 citation statements)

References 42 publications

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“…The basic principle is the ignition of an arc plasma in the vapors of the material of interest [ 45 ]. After ignition of chromium plasma, presented in detail in a previous paper [ 47 ], the N 2 gas is laterally injected at a flow rate of 25 sccm (standard cubic centimetres per minute) with a high-precision flowmeter model MCV 0–50 sccm. The pressure in the reaction chamber during deposition was 2.5 × 10 −4 mbar.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Testing of CrNx-Coated 310 H Stainless Steel under Simulated Supercritical Water Conditions

et al. 2022

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The paper’s aim is the assessment of corrosion behaviour of a CrNx-coated 310 H stainless steel under simulated supercritical water conditions (550 °C and 25 MPa) for up to 2160 h. The CrNx coating was obtained by the thermionic vacuum arc (TVA) method. The oxides grown on this coating were characterized using metallographic and gravimetric analysis, SEM with EDS, and grazing incidence X-ray diffraction (GIXRD). A diffusion mechanism drives oxidation kinetics because it follows a parabolic law. By XRD analysis, the presence of Cr2O3 and Fe3O4 on the surface of the autoclaved CrNx-coated 310 H samples were highlighted. Corrosion susceptibility assessment was performed by electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization. EIS impedance spectra show the presence of two capacitive semicircles in the Nyquist diagram, highlighting both the presence of the CrNx coating and the oxide film formed during autoclaving on the 310 H stainless steel. Very low corrosion rates, with values up to 11 nm × year−1, obtained in the case of autoclaved for 2160 h, CrNx-coated samples indicated that the oxides formed on these samples are protective and provide better corrosion resistance. The determination of micro hardness Vickers completed the above investigation.

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Section: Methodsmentioning

confidence: 99%

Corrosion Testing of CrNx-Coated 310 H Stainless Steel under Simulated Supercritical Water Conditions

et al. 2022

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“…Therefore, these types of coatings would be ideal to reduce the corrosion of materials in a nuclear environment. This applies to current LWR reactors (BWR, PWR, and CANDU) but also to Generation IV reactors such as SCWR or metal-cooled reactors liquids [ 142 , 143 , 144 ].…”

Section: Relations Between Microstructures and Alloys Performance Of ...mentioning

confidence: 99%

Aspects of Applied Chemistry Related to Future Goals of Safety and Efficiency in Materials Development for Nuclear Energy

Golgovici

Tudose²,

Diniasi³

et al. 2023

Molecules

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The present paper is a narrative review focused on a few important aspects and moments of trends surrounding materials and methods in sustainable nuclear energy, as an expression of applied chemistry support for more efficiency and safety. In such context, the paper is focused firstly on increasing alloy performance by modifying compositions, and elaborating and testing novel coatings on Zr alloys and stainless steel. For future generation reactor systems, the paper proposes high entropy alloys presenting their composition selection and irradiation damage. Nowadays, when great uncertainties and complex social, environmental, and political factors influence energy type selection, any challenge in this field is based on the concept of increased security and materials performance leading to more investigations into applied science.

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“…One of the ways to improve the corrosion resistance of existing materials in liquid lead is through the application of various deposition techniques on the surface of metallic or ceramic layers. There are several coating techniques used for advanced nuclear materials, including thermal spray (TS), chemical vapor deposition (CVD), physical vapor deposition (PVD), pulsed laser deposition (PLD), electrodeposition, sol-gel, pack cementation, cold spray, hot dipping, and thermionic vacuum arc procedure [34,35]. To obtain the desired characteristics of the coatings, these techniques can be modified or, in some cases, combined.…”

Section: Introductionmentioning

confidence: 99%

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

Petrescu

Nitu

Golgovici

et al. 2023

Metals

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The use of lead as a primary coolant is one of the most attractive options for next-generation lead-cooled fast reactor systems (LFR). Despite many favourable features, liquid Pb is a harsh environment that induces many problems on metallic components. Therefore, candidate materials for LFR must be qualified, and the solutions to improve their properties must be found. This paper’s objective is to present the results obtained from the tensile tests of AISI 316L steel in liquid lead at 400 °C, 450 °C, and 500 °C, and the short-term corrosion tests performed on coated and uncoated AISI 316L steel at 550 °C. The coating was made of Al2O3 with a CrNiAlY interlayer using the electron beam-physical vapor deposition (EB-PVD) technique. Both the mechanical and corrosion tests were performed in stagnant lead saturated with oxygen. After testing, the specimens were characterised by several analyses, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), optical microscopy (OM), scratching test, and Vickers micro-hardness test. The tensile test results highlight the ductile behaviour of the material, and in the case of the corrosion tests, the coatings prove to be effective in protecting the substrate from the harsh environment.

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Corrosion Behavior of Chromium Coated Zy-4 Cladding under CANDU Primary Circuit Conditions

Cited by 7 publications

References 42 publications

Corrosion Testing of CrNx-Coated 310 H Stainless Steel under Simulated Supercritical Water Conditions

Corrosion Testing of CrNx-Coated 310 H Stainless Steel under Simulated Supercritical Water Conditions

Aspects of Applied Chemistry Related to Future Goals of Safety and Efficiency in Materials Development for Nuclear Energy

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

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