Chlorine-induced high-temperature corrosion characteristics of Ni-Cr alloy cladding layer and Ni-Cr-Mo alloy cladding layer

Wang, Xinyu; Liu, Zongde; Cheng, Kehan; Kong, Yao

doi:10.1016/j.corsci.2023.111102

Cited by 26 publications

(7 citation statements)

References 78 publications

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“…The loose corrosion products could not block the mixed salt contact with the cladding layer, so that chloride ions could constantly consume the metal elements of the cladding layer through the above reaction. Sulfate ions could also react with the metal elements of the cladding layer to generate metal sulfides [4]. Once the corrosion layer is dissolved and does not have protective properties, Ni-sulfide particles appear between the broken oxide layer, thus causing more severe corrosion.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, laser-cladding technology has a lower heat input, significantly reducing the heat-affected zone of the boiler tube collective, but can also effectively prevent the dilution Coatings 2023, 13, 1320 2 of 14 rate being too high to affect the corrosion resistance of the laser-cladding layer. The lasermelting layer is metallurgically bonded to the substrate material without cracks and holes, which can significantly improve the wear and the corrosion resistance of the surface of the substrate material [4][5][6]. High-temperature corrosion protection using laser-melting cladding technology has received extensive attention from scholars [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Corrosion Characteristics of Ni-20Cr-xSi Alloy Laser Cladding Layer in NaCl-KCl-Na2SO4-K2SO4 Mixed Salt Environment

Chen

Liu

2023

Coatings

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Ni-Cr-Si-alloy-cladding layers with Si contents of 0 wt.%, 1 wt.%, 3 wt.% and 5 wt.% were prepared via a laser-cladding technique, and the effect of Si content on the high-temperature corrosion resistance of the Ni-20Cr-Si-alloy-cladding layers in NaCl-KCl-K2SO4-Na2SO4 mixed salt was systematically investigated. The results show that at 600 °C, the four cladding layers rely mainly on the generation of dense Cr2O3 on the surface to hinder the continuation of corrosion. The addition of Si helps to improve the stability of Cr2O3 in the mixed salt, and on the other hand Si is enriched in the corrosion layer, which can effectively hinder the penetration of the corrosive medium. The addition of Si can effectively improve the high-temperature corrosion resistance of the Ni-20Cr-cladding layer, whereas the corrosion product layer is prone to spalling when the Si content is ≥3 wt.%. The best corrosion resistance was demonstrated by Ni-20Cr-1Si in NaCl-KCl-K2SO4-Na2SO4 mixed salt.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Temperature Corrosion Characteristics of Ni-20Cr-xSi Alloy Laser Cladding Layer in NaCl-KCl-Na2SO4-K2SO4 Mixed Salt Environment

Chen

Liu

2023

Coatings

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“…In the high-temperature chlorine corrosion environment of biomass boilers, a high Cr content in alloys is not conducive to improving the protective performance against chlorine corrosion [59]. He et al used high-velocity flame spraying to prepare FeCoCrNiAlTix high-entropy alloy coatings on a Q235 substrate [60].…”

Section: Anticorrosion Technologymentioning

confidence: 99%

New Problems of Boiler Corrosion after Coupling Combustion of Coal and Biomass and Anti-Corrosion Technologies

Wang,

Ma,

Zhao

et al. 2024

JRM

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This study explores the corrosion issues arising from the coupled combustion of coal and biomass and proposes potential solutions. Biomass, as a renewable energy source, offers advantages in energy-saving and carbon reduction. However, the corrosive effects of alkali metal compounds, sulfur (S) and chlorine (Cl) elements in the ash after combustion cannot be underestimated due to the high volatile content of biomass fuels. We investigate the corrosion mechanisms, as well as the transfer of Cl and alkali metal elements during this process. Comparative corrosion analyses are conducted among coal-fired boilers, pure biomass boilers and boilers with coupled combustion. Various biomass types in co-firing are studied to understand different corrosion outcomes. The main factors influencing corrosion include the physicochemical properties of biomass feedstock, furnace temperature and heating surface materials, with the chemical composition and ash content of biomass playing a dominant role. Currently, the methods used for anti-corrosion include water washing pretreatment of biomass feedstock, application of novel alloys and coatings and the development of additives to inhibit fouling, ash deposition and corrosion. Efficient inhibitors are economical and easy to produce. Additionally, biomass can be converted into biomass gasification gas, although challenges related to tar still need to be addressed.

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“…Ni-Cr alloys exhibit significant oxidation and corrosion resistance at moderately high temperatures and possess commendable mechanical strength [1][2][3]. They are widely used in applications related to harsh environments, such as corrosion and oxidationresistant coatings or turbine disks [4,5].…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulation Study of Grain Boundary Segregation and Grain Boundary Migration in Ni-Cr Alloys

Huang,

Xiao,

et al. 2024

Metals

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Using Molecular Dynamics (MD) and Monte Carlo (MC) simulations, we studied the grain boundary (GB) segregation under different temperatures and Cr concentrations in Ni-Cr alloys with two distinct grain-boundary structures, i.e., Σ5(310)[010] and Σ101(200)[100]. Temperature plays a minor influence on Cr segregation for Σ5(310)[010] GB, but Cr segregation rapidly diminishes with elevating temperatures for Σ101(200)[100] GB. We also used the synthetic driving force and corresponding identification methods to investigate the effect of Cr solute segregation on grain boundary stability. All Σ5(310)[010] models have multi-stage grain boundary migration at 800 K. In the first stage, the grain boundary’s slow acceleration time is related to solute concentration. The migration temperature can influence this phenomenon. As temperatures rise, the duration of this slow acceleration phase diminishes. No similar phenomenon was observed in the process of the grain boundary movement of Σ101(200)[100]. The influence of solute concentration on grain boundary migration is complicated. The segregation concentration at the grain boundary cannot be regarded as the only factor affecting the migration of the grain boundary because the Cr atom on the grain boundary does not move with the grain boundary. This work will also discuss the grain boundary migration‘s relationship with lattice distortion and grain boundary atom diffusion. The results and findings of this study provide further insights into the segregation-increase GB stabilization of NC Ni-Cr alloys.

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Chlorine-induced high-temperature corrosion characteristics of Ni-Cr alloy cladding layer and Ni-Cr-Mo alloy cladding layer

Cited by 26 publications

References 78 publications

High-Temperature Corrosion Characteristics of Ni-20Cr-xSi Alloy Laser Cladding Layer in NaCl-KCl-Na2SO4-K2SO4 Mixed Salt Environment

High-Temperature Corrosion Characteristics of Ni-20Cr-xSi Alloy Laser Cladding Layer in NaCl-KCl-Na2SO4-K2SO4 Mixed Salt Environment

New Problems of Boiler Corrosion after Coupling Combustion of Coal and Biomass and Anti-Corrosion Technologies

Atomistic Simulation Study of Grain Boundary Segregation and Grain Boundary Migration in Ni-Cr Alloys

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