Pitting resistivity of Ni-based bulk metallic glasses in chloride solution

Emran, Khadijah M.; AL-Refai, Hanaa H.

doi:10.1039/c7ra05709a

Cited by 14 publications

(5 citation statements)

References 32 publications

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“…AFM is conducted to analyze the surface morphology of the corrosion products on a steel surface. Emran et al [89] examined the influence of Cl − on the pitting corrosion of nickel-based alloys in a sodium nitrate solution.…”

Section: Surface Morphology and Chemical Compositionmentioning

confidence: 99%

A review of passivity breakdown on metal surfaces: influence of chloride- and sulfide-ion concentrations, temperature, and pH

2021

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Metals, including austenitic steels and alloys, have been extensively applied in industrial and engineering applications. Passive films on metal surfaces are very important for corrosion protection. However, localized attack, such as passive film breakdown and the initiation of pits, is found upon exposure of such metals to aggressive ion-containing environments, leading to material failure and prominent adverse economic and safety concerns. For several decades, the mechanism of passivity breakdown and pit nucleation during pitting corrosion has been widely studied. The present article provides a detailed review of passive film breakdown on metal surfaces and the effects of complicated conditions, such as chloride- and sulfide-ion concentrations, temperature, and solution pH, on passivity breakdown. The possible mechanism for passivity breakdown is reviewed and discussed. The composition, structure, and electronic properties of passive layers are of conclusive importance to understand the leading corrosion mechanism, and they have been investigated with different techniques. Furthermore, we aim to present the structure, chemical composition, and electronic properties of passive films on metal surfaces by using X-ray photoelectron spectroscopy and energy-dispersive spectroscopy. Additionally, the surface morphology of passive films is analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) techniques. Finally, the effect of chloride- and sulfide-ion concentrations, pH, and temperature on passivity breakdown is discussed in detail.

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Section: Surface Morphology and Chemical Compositionmentioning

confidence: 99%

A review of passivity breakdown on metal surfaces: influence of chloride- and sulfide-ion concentrations, temperature, and pH

2021

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“…1,[6][7][8][9][10][11] Nitrite has been reported to inhibit corrosion of alloys, [12][13][14][15][16] while nitrate was regarded as either a corrosion inhibitor [17][18][19][20][21][22] or an aggressive species. 6,[23][24][25] Several hypotheses of LAI corrosion in this environment have been proposed, which include increase of aggressive chloride concentration due to evaporation, 2,26 ohmic potential drop due to crevice-like meniscus geometry, 6,27 and depletion of OH − due to CO 2 from air. 2,3,5,26,28 Firstly, LAI corrosion in liquid nuclear waste environment has been ascribed to the formation of a chloride concentration cell, and the chloride concentration at the meniscus would increase due to evaporation.…”

mentioning

confidence: 99%

Liquid-Air Interface Corrosion of A537 Steel in High Level Liquid Radioactive Waste Simulant in a Sealed Container

Xu¹,

Zhang²,

Yang³

et al. 2019

J. Electrochem. Soc.

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Liquid-air interface (LAI) corrosion is regarded as a potential issue for interim storage tanks of high level liquid radioactive waste. Insightful studies have been carried out and several hypotheses have been proposed so far, while none has been directly confirmed experimentally. A sealed container has been developed to investigate the effect of atmosphere on LAI corrosion of partially immersed A537 steels, in which the composition and temperature of air can be changed accordingly, i.e. CO 2 concentration varied between 0.05 wt% (natural air) and 1.97 wt%, and temperature varied between 25 • C and 34 • C. It has been found that the pitting initiation process under both anodic polarization and free immersion conditions can be largely accelerated by the increase of CO 2 concentration. More importantly, a planar pH electrode has been applied to measure pH at the interface during anodic polarization and free immersion, and the occurrence of LAI corrosion can be correlated with the same interface pH at a certain temperature regardless of CO 2 concentration, indicating a "critical pH" for LAI corrosion determined by this method. This finding suggests that LAI corrosion in high level liquid radioactive waste may be investigated through determination of a critical pH in certain circumstances.

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“…The increased concentration of the HCl increased the presence of Cl À , which replace oxygen by forming complex metallic anions inside the solution and causing the dissolution of the thin passive film (Yang et al, 2019). The thin passive film breakdown enables the aggressive penetration of the chloride ions through the alloy/oxide and SPFA reinforcement interface, causing the dissolution of SPFA and thereby changing the colour of the acid from colourless to black, as shown in Figure 4 (Emran and AL-Refai, 2017). Pitting corrosion was initiated at the sites of the dissolution of the SPFA forming pits of different shapes and sizes.…”

Section: Hardness Resultsmentioning

confidence: 99%

“…, 2019). The thin passive film breakdown enables the aggressive penetration of the chloride ions through the alloy/oxide and SPFA reinforcement interface, causing the dissolution of SPFA and thereby changing the colour of the acid from colourless to black, as shown in Figure 4 (Emran and AL-Refai, 2017). Pitting corrosion was initiated at the sites of the dissolution of the SPFA forming pits of different shapes and sizes.…”

Section: Resultsmentioning

confidence: 99%

Hardness and corrosion behaviour of stir cast LM26 Al/sugar palm fibre ash composites

Aliyu,

Sapuan,

Zainudin

et al. 2023

MMMS

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PurposeThe conflicting results on the corrosion characteristics of aluminium matrix composites reinforced with agrarian waste have stimulated an investigation on the hardness and corrosion rate of sugar palm fibre ash (SPFA) reinforced LM26 Al/alloy composite by varying the SPFA from 0 to 10 wt% in an interval of 2 wt%. This paper aims to discuss the aforementioned issue.Design/methodology/approachThe composites were produced via stir-casting and the hardness was determined using a Vickers hardness testing machine, corrosion rate was examined through the weight loss method by immersion in 0.5, 1.0 and 1.5 M hydrochloric acid (HCl) at temperatures of 303, 318, and 333 K for the maximum duration of 120 h. The morphological study was conducted using a scanning electron microscope (SEM) on the samples before and after immersion in HCl.FindingsThe incorporation of SPFA improved the hardness of the alloy from 58.22 to 93.62 VH after 10 wt% addition. The corrosion rate increases with increased content of SPFA, the concentration of HCl and temperature. The least corrosion rate of 0.0272 mpy was observed for the LM26 Al alloy in 0.5 M after 24 h while the highest corrosion rate of 0.8511 mpy was recorded for LM26 Al/10 wt% SPFA in 1.5 M HCl acid after 120 h. The SEM image of corroded samples revealed an increased number of pits with increased SPFA content.Research limitations/implicationsThe work is limited to SPFA up to 10 wt% as reinforcement in LM26 Al alloy, the use of HCl as corrosion medium, temperatures in the range of 303–333 K, and a weight loss method were used to evaluate the corrosion rate.Originality/valueThe corrosion rate was determined for LM26 Al/SPFA composites with various amounts of SPFA in 0.5, 1.0 and 1.5 M HCl at 303, 318 and 333 K and compared with the matrix alloy.

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Pitting resistivity of Ni-based bulk metallic glasses in chloride solution

Abstract: Resistance of new Ni70Cr21Si0.5B0.5P8C≤0.1Co≤1Fe≤1 and Ni72.65Cr7.3Si6.7B2.15C≤0.06Fe8.2Mo3 glassy alloys to pitting corrosion was studied in 0.25 M sodium nitrate solution, with or without addition of chloride ions, using EIS, CP and EFM techniques.

Cited by 14 publications

References 32 publications

A review of passivity breakdown on metal surfaces: influence of chloride- and sulfide-ion concentrations, temperature, and pH

A review of passivity breakdown on metal surfaces: influence of chloride- and sulfide-ion concentrations, temperature, and pH

Liquid-Air Interface Corrosion of A537 Steel in High Level Liquid Radioactive Waste Simulant in a Sealed Container

Hardness and corrosion behaviour of stir cast LM26 Al/sugar palm fibre ash composites

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