A comparison of the corrosion behaviour of copper materials in dilute nitric acid

Dobkowska, Anna; Castillo, Millicent Dayle H.; Turnbull, Joseph; Ramamurthy, S.; Zagidulin, Dmitrij; Moser, D. E.; Behazin, Mehran; Keech, Peter G.; Shoesmith, David W.; Noël, James J.

doi:10.1016/j.corsci.2021.109778

Cited by 23 publications

(15 citation statements)

References 56 publications

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“…Previously, it has been shown 33 that the presence of splat boundaries (also called inter-particle interfaces or splat-splat interfaces) is due to the deformation of Cu particles, on impingement at a high kinetic energy. As speculated previously, 33,34,46 the corrosion of CS-Cu could propagate differently in the proximity of splat boundaries and/or at open pore areas than on the surface of the bulk material.…”

Section: Resultsmentioning

confidence: 56%

The Early-Stage Corrosion of Copper Materials in Chloride and Sulfide Solutions: Nanoscale Characterization and The Effect of Microstructure

Guo¹,

Daub²,

Dong³

et al. 2022

J. Electrochem. Soc.

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The microstructures of copper (Cu) materials were investigated by electron backscatter diffraction, showing that electrodeposited (ED) Cu has a homogenous polycrystalline microstructure, while cold spray (CS) Cu has a heterogeneous microstructure with varying grain size, pores, and interfacial splat regions. The corrosion rate was examined by corrosion potential (ECORR) and polarization resistance (Rp) measurements on Cu specimens in solutions containing 0.1 M NaCl + 1 × 10−3 M Na2S. Although the as sprayed CS-Cu was the least corrosion resistant, the corrosion rate of the heat-treated CS-Cu was similar to that of the ED-Cu and wrought Cu (SKB-Cu). Electrochemical behaviours of Cu materials were investigated by either a potentiodynamic scan or a potentiostatic polarization at a more positive potential (E > ECORR) for various experiment durations up to 4 h, showing that the heat-treated CS-Cu, SKB-Cu and ED-Cu exhibited very similar behaviour while the as sprayed CS-Cu showed erratic behavior consistent with a variable surface reactivity. Nanoscale scanning transmission electron microscopy analysis has been performed at the cross-section of an anodically-oxidized CS-Cu specimen, revealing a two-layer film structure, mostly composed of Cu sulfide, with a minor diffusion of sulfur in the local area of an interfacial splat boundary tip.

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Section: Resultsmentioning

confidence: 56%

The Early-Stage Corrosion of Copper Materials in Chloride and Sulfide Solutions: Nanoscale Characterization and The Effect of Microstructure

Guo¹,

Daub²,

Dong³

et al. 2022

J. Electrochem. Soc.

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“…49 The greatly reduced surface area would reduce the Au use efficiency and the overall photothermal conversion efficiency. As the crystallographic orientation of grains greatly affects the corrosion behavior and further volume shrinkage, 50 we may control the shrinkage direction of an alloy during dealloying by tuning its crystal orientation, considering that the thickness reduction caused by volume shrinkage has little effect on the photothermal conversion (Figure 1a and b).…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Photothermal Steam Generation and Gold Using the Efficiency of Ultralight Gold Foam with Hierarchical Porosity

Zhang

et al. 2023

Langmuir

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Controlling the optical properties of metal plasma nanomaterials through structure manipulation has attracted great attention for solar steam generation. However, realizing broadband solar absorption for high-efficiency vapor generation is still challenging. In this work, a free-standing ultralight gold film/foam with a hierarchical porous microstructure and high porosity is obtained through controllably etching a designed cold-rolled (NiCoFeCr)99Au1 high-entropy precursor alloy with a unique grain texture. During chemical dealloying, the high-entropy precursor went through anisotropic contraction, resulting in a larger surface area compared with that from the Cu99Au1 precursor although the volume shrinkage is similar (over 85%), which is beneficial for the photothermal conversion. The low Au content also results in a special hierarchical lamellar microstructure with both micropores and nanopores within each lamella, which significantly broadens the optical absorption range and makes the optical absorption of the porous film reach 71.1–94.6% between 250 and 2500 nm. In addition, the free-standing nanoporous gold film has excellent hydrophilicity, with the contact angle reaching zero within 2.2 s. Thus, the 28 h dealloyed nanoporous gold film (NPG-28) exhibits a rapid evaporation rate of seawater under 1 kW m–2 light intensity, reaching 1.53 kg m–2 h–1, and the photothermal conversion efficiency reaches 96.28%. This work demonstrates the enhanced noble metal gold using efficiency and solar thermal conversion efficiency by controlled anisotropic shrinkage and forming a hierarchical porous foam.

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“…The effect of grain refinement resulting from SPD processing on the corrosion resistance for different Al alloys is still unclear. Generally, grain-size reduction results in a significant increase in volume fraction of the intracrystalline regions, such as grain boundaries and triple junctions [ 11 , 12 ], which are more chemically active than grain interiors [ 13 , 14 , 15 , 16 ]. This leads to the accelerated formation of passive films [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Pitting-Corrosion Resistance of Ultrafine-Grained 7475 Al Alloy by Aging

Ura‐Bińczyk

2022

Materials

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The effect of aging on the resistance to pitting corrosion of ultrafine-grained 7475 aluminium (Al) alloy processed by hydrostatic extrusion (HE) is studied. Differences in the microstructure were investigated using secondary electron (SEM) and transmission electron microscopy (TEM). Corrosion tests were performed in 0.1 M NaCl, and characterization of corroded surface was performed. The results of this work show that the pitting susceptibility of ultra-fine grained 7475Al is related to the distribution of MgZn2 precipitates. After HE, the formation of An ultrafine-grained microstructure at the grain boundaries of ultrafine grains is observed, while subsequent aging results in the formation of MgZn2 precipitates in the grain interior. Grain refinement increases susceptibility to localized attack, while the subsequent aging improves the overall corrosion resistance and limits the propagation of corrosion attack.

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A comparison of the corrosion behaviour of copper materials in dilute nitric acid

Cited by 23 publications

References 56 publications

The Early-Stage Corrosion of Copper Materials in Chloride and Sulfide Solutions: Nanoscale Characterization and The Effect of Microstructure

The Early-Stage Corrosion of Copper Materials in Chloride and Sulfide Solutions: Nanoscale Characterization and The Effect of Microstructure

Enhanced Photothermal Steam Generation and Gold Using the Efficiency of Ultralight Gold Foam with Hierarchical Porosity

Improvement of Pitting-Corrosion Resistance of Ultrafine-Grained 7475 Al Alloy by Aging

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