Oxidation behavior of the supercritical water on the ternary Ni-W-P coating

Ren, Longfang; Cheng, Yanhai; Wang, Shuai; Meng, Xiuxia; Qin, Qiang; Yang, Jinyong

doi:10.1016/j.cej.2019.04.011

Cited by 36 publications

(11 citation statements)

References 54 publications

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“…Oxidation tests were conducted using an SCW loop facility, and its schematic diagram rig is shown in Figure 1. The whole system is composed of three main parts: peristaltic pump, preheater, and cooler 32 . Before oxidation, the specimens were placed in the reactor with nickel wire through the holes.…”

Section: Methodsmentioning

confidence: 99%

“…The whole system is composed of three main parts: peristaltic pump, preheater, and cooler. 32 Before oxidation, the specimens were placed in the reactor with nickel wire through the holes. Distilled water and 30% hydrogen peroxide were pumped into the preheater by the peristaltic pump and were later heated to 573 K. After that, the mixed solution was further transported to the reaction kettle, and the specimens were oxidized in SCW for up to 200 h at 798 K and 24 MPa.…”

Section: Methodsmentioning

confidence: 99%

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Corrosion behavior of 316 stainless steel for advanced high‐temperature water‐cooled nuclear plant

Cheng

Liu

Yang

et al. 2022

Surface & Interface Analysis

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Corrosion occurs widely in the supercritical water system materials under high temperature and pressure. To select reliable candidate materials, corrosion behavior of many alloys was investigated. This study focused on investigating the corrosion behavior of 316 stainless steel (316 SS) in supercritical water (798 K/24 MPa). After exposed to SCW for 200 h, the oxidation kinetics, surface morphology, and diffusion of elements were investigated by weight measurement, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The surface of 316 SS showed isolated and discontinued oxide scales. The oxide scale was determined to be a monolayer layer, and the main composition was determined to be Fe-Cr-rich spinel with a few amounts of magnetite attached to the surface. A few pores due to pitting corrosion were found on the surface, and the oxidation mechanism was also investigated.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Corrosion behavior of 316 stainless steel for advanced high‐temperature water‐cooled nuclear plant

Cheng

Liu

Yang

et al. 2022

Surface & Interface Analysis

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“…The exposure experiments of mild steel (1015) specimen with Ni–W–P coating in supercritical water oxidation show that W and P atoms release from the coating and the P atoms react with Ni after the break of the Ni cells. This results in the formation of Ni 5 P 4 , which may be partially gasified at high temperatures . The reactions between Ni and P are expressed as follows: …”

Section: Reactions Of Typical Elementsmentioning

confidence: 99%

“…This results in the formation of Ni 5 P 4 , which may be partially gasified at high temperatures. 53 The reactions between Ni and P are expressed as follows:…”

Section: Reactions Of Nimentioning

confidence: 99%

Oxidation Processes and Involved Chemical Reactions of Corrosion-Resistant Alloys in Supercritical Water

Guo

Ning

et al. 2020

Ind. Eng. Chem. Res.

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Corrosion continues to be a major challenge in developing supercritical water-cooled reactor and supercritical water oxidation systems. Corrosion behaviors of candidate alloy materials used in these environments are significantly affected by the properties of oxides formed on alloy surfaces. This work presents a comprehensive review of the oxidation processes and involved chemical reactions of corrosion-resistant alloys in supercritical water. The oxidation process of an alloy in supercritical water is proposed to have two stages, and chemical reactions at these two stages are described in detail. The transitions of Cr/Ni/Fe oxides and the formation mechanism of oxide film are analyzed comprehensively. Moreover, the diffusion property, protection effect, and stability of oxides in supercritical water are summarized systematically.

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“…The fouling problem, which is regarded as "the main unresolved problem in heat transfer", is mainly generated by the deposition of particulates, impurities, salts, and various organic species onto heat transfer surfaces [1][2][3]. It can be seen from Figure 1 that the fouling of calcium carbonate Since the 1980s, electroless plating has been treated as an operational technology of the surface modification, attracting widespread attention [4][5][6][7][8]. The results prove that electroless Ni-P-based coating is an advantageous method for fouling inhibition [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

et al. 2020

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Since the formation of fouling reduces heat transfer efficiency and causes energy loss, anti-fouling is desirable and may be achieved by coating. In this work, a nickel-tungsten-phosphorus (Ni-W-P) coating was prepared on the mild steel (1015) substrate using electroless plating by varying sodium tungstate concentration to improve its anti-fouling property. Surface morphology, microstructure, fouling behavior, and heat transfer performance of coatings were further reported. Also, the reaction path, transition state, and energy gradient change of calcite, aragonite, and vaterite were also calculated. During the deposition process, as the W and P elements were solids dissolved in the Ni crystal cell, the content of Ni element was obviously higher than that of the other two elements. Globular morphology was evenly covered on the surface. Consequently, the thermal conductivity of ternary Ni-W-P coating decreases from 8.48 W/m·K to 8.19 W/m·K with the increase of W content. Additionally, it goes up to 8.93 W/m·K with the increase of heat source temperature 343 K. Oxidation products are always accompanied by deposits of calcite-phase CaCO3 fouling. Due to the low surface energy of Ni-W-P coating, Ca2+ and [CO3]2− are prone to cross the transition state with a low energy barrier of 0.10 eV, resulting in the more formation of aragonite-phase CaCO3 fouling on ternary Ni-W-P coating. Nevertheless, because of the interaction of high surface energy and oxidation products on the bare matrix or Ni-W-P coating with superior W content, free Ca2+ and [CO3]2− can be easy to nucleate into calcite. As time goes on, the heat transfer efficiency of material with Ni-W-P coating is superior to the bare surface.

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Oxidation behavior of the supercritical water on the ternary Ni-W-P coating

Cited by 36 publications

References 54 publications

Corrosion behavior of 316 stainless steel for advanced high‐temperature water‐cooled nuclear plant

Corrosion behavior of 316 stainless steel for advanced high‐temperature water‐cooled nuclear plant

Oxidation Processes and Involved Chemical Reactions of Corrosion-Resistant Alloys in Supercritical Water

Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

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