Affection of Cu content on the phase evolution during the dealloying of Ag-Cu alloys using electrochemical noise with Hilbert spectra analysis

Zhang, Xiaochen; Wang, X.; Huang, J.C.; Chen, Xinran; Cao, Le; Mu, Miaomiao

doi:10.1016/j.matlet.2016.07.116

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…Li, Moshrefi, Lara-Banda, Chui, and Liu [35,[108][109][110][111][112][113][114][115][116] agree with the method to determine passivation and metastable pitting. Asfia et al also determined that is a good option to eliminate trend without eliminating corrosion data [105,114,117] and that it is helpful to determine corrosion mechanisms in distinct media [118][119][120]. Various authors indicate that the interpretation of wavelet is more useful to determinate corrosion mechanism that statistical methods [110,111].…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Noise Analysis of the Corrosion of Titanium Alloys in NaCl and H2SO4 Solutions

Jáquez-Muñoz

Gaona-Tiburcio

Miramontes

et al. 2021

Metals

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Titanium alloys have been used in aerospace, aeronautic, automotive, biomedical, structural, and other applications because titanium alloys have less density than materials like steel and support higher stress than Al-alloys. However, components made of titanium alloys are exposed to corrosive environments, the most common being industrial and marine atmospheres. This research shows the corrosion behavior of three titanium alloys, specifically Ti-CP2, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-4V with α, near α, and α + β alloys phases. Alloys were exposed in two electrolytes to a 3.5 wt. % H2SO4 and NaCl solution at room temperature, and their electrochemical behavior was studied by electrochemical noise technique (EN) according to ASTM ASTM-G199 standard. EN signal was filtered by three different methods, and the polynomial method was employed to obtain Rn, kurtosis, skew, and the potential spectral density analysis (PSD). The wavelets method was used, from which energy dispersion plots were obtained. The last method was Hilbert–Huang Transform (HHT), where Hilbert Spectra were analyzed. Results indicated that Rn compared with PSD showed that Ti-6Al-2Sn-4Zr-2Mo presented less dissolution in both electrolytes. Statistical methods showed that the passive layer created on Ti alloys’ surfaces is unstable; this condition is notable for Ti-6Al-2Sn-4Zr-2Mo in NaCl solution.

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Section: Discussionmentioning

confidence: 99%

Electrochemical Noise Analysis of the Corrosion of Titanium Alloys in NaCl and H2SO4 Solutions

Jáquez-Muñoz

Gaona-Tiburcio

Miramontes

et al. 2021

Metals

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“…According to the alloy phase diagram in Figure 4e, there are two alloy phases in Ag−Cu alloy: one is the α phase poor in Cu, and the other is the β phase rich in Cu. It has been reported that an increasing content of Cu in Ag−Cu alloy leads to an increased corrosion rate, 34 which means more active electrochemical properties of the β phase compared with the α phase. These two phases divide the alloy and interface into different electrochemical regions, as shown in Figure 4c,d of Ag and Cu makes Cu dissolve preferentially before Ag in Ag−Cu alloy due to the galvanic reaction in the interface, and this phenomenon has been proved by the studies of Assaf et al 35 With H 2 O molecules as the electrolyte in the interface between the top alloy electrode and the switching layer, the oxidation reaction rate of Cu in the β phase will be accelerated greatly.…”

Section: Resultsmentioning

confidence: 99%

“…According to the alloy phase diagram in Figure e, there are two alloy phases in Ag–Cu alloy: one is the α phase poor in Cu, and the other is the β phase rich in Cu. It has been reported that an increasing content of Cu in Ag–Cu alloy leads to an increased corrosion rate, which means more active electrochemical properties of the β phase compared with the α phase. These two phases divide the alloy and interface into different electrochemical regions, as shown in Figure c,d.…”

Section: Resultsmentioning

confidence: 99%

Performance Improvement of Conductive Bridging Random Access Memory by Electrode Alloying

et al. 2020

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Large parameter variability is identified as one of the main problems in conductive bridging random access memory (CBRAM) at the device level impeding large-scale commercial applications. Here, we achieve performance improvement by electrode alloying in sandwich-structure Ag 65 Cu 35 /HfO x /Pt devices. Cu conductive filaments have been demonstrated to be responsible for the resistive switching behaviors in Ag−Cu alloy electrode CBRAM via direct observation by transmission electron microscopy. Compared with Cu/HfO x /Pt devices, the alloy electrode devices show lower forming and SET voltages, better SET voltage distribution uniformity, and a faster response speed. The alloy phase diagram combined with the galvanic effect is proposed to explain the formation of Cu conductive filaments and the improved switching uniformity in CBRAM with an Ag−Cu alloy electrode. The use of an Ag−Cu alloy electrode and understanding its role would advance the implementation of high-density integration of CBRAM.

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“…Dealloying by free corrosion in an aqueous solution has already been studied by various methods such as in situ electrochemical noise or Raman spectroscopy, for example [4,[21][22][23]. It was even 3D imaged in situ to study the evolution of the dealloying front and coarsening and the effect of different parameters on the dealloying process such as precursor composition or acid concentration [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

In situ observation of liquid metal dealloying and etching of porous FeCr by X-ray tomography and X-ray diffraction

et al. 2021

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Affection of Cu content on the phase evolution during the dealloying of Ag-Cu alloys using electrochemical noise with Hilbert spectra analysis

Cited by 12 publications

References 14 publications

Electrochemical Noise Analysis of the Corrosion of Titanium Alloys in NaCl and H2SO4 Solutions

Electrochemical Noise Analysis of the Corrosion of Titanium Alloys in NaCl and H2SO4 Solutions

Performance Improvement of Conductive Bridging Random Access Memory by Electrode Alloying

In situ observation of liquid metal dealloying and etching of porous FeCr by X-ray tomography and X-ray diffraction

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