Corrosion behavior of 6061/Al-15 vol. pct. SiC(p) composite and the base alloy in sodium hydroxide solution

Kumari, P.D. Reena; Nayak, Jagannath; Shetty, A. Nityananda

doi:10.1016/j.arabjc.2011.12.003

Cited by 56 publications

(24 citation statements)

References 28 publications

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“…This inductive response has been reported in many researches [22-26, 34, 35]. Its origin is highly relevant to the existence of aluminum oxides and commonly ascribed to the surface or bulk relaxation of the intermediates into the oxide layer [29]. In our cases, the adsorption of intermediate species, such as Al + , Al 2+ and Al(OH) ad , can also result in the inductive response.…”

Section: Electrochemical Impedance Spectroscopy Measurementssupporting

confidence: 68%

“…It is noteworthy that the diameter of HF capacitor loop reaches the largest in the case of pH 4 and pH 7, approximately three times as compared with high acidic (pH 2) or in high alkaline (pH 11) medium, indicating a relative outstanding surface resistance existed in moderately acidic and neutral conditions. The appearance of second capacitor loop assigns to the dissolution of surface oxide film [29,30]. From figure 1(a), the diameter of characteristic low frequency loop varies with pH change, being maximized in the neutral environment and tending to reduce as the pH changing away from 7.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

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Corrosion behavior of aluminum in molten hydrated salt phase change materials for thermal energy storage

Zhao

Munis

Rehman

et al. 2020

Mater. Res. Express

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The corrosion behavior of aluminum 1060 in hydrated salt phase change materials (PCM) melts comprised of Na 2 HPO 4 ·12H 2 O -Na 2 SO 4 ·10H 2 O was investigated through electrochemical tests as a function of pH. The pH of PCM medium was adjusted by adding H 2 SO 4 or NaOH. Electrochemical impedance spectroscopy reveals the existence of concentration difference layer at aluminum/PCM interface ascribed to the adsorption of PCM species and the formation of aluminum oxides. The observed anodic branch of DC polarization exhibits potential independence which is ascribed to the formation of surface oxide film and the accumulation of hydrogen molecules inside surface pores. The oxide film formed at neutral condition is characterized as the most compact and corrosion resistant while as the environmental pH shifts away from 7 the oxides/aluminum dissolution is accelerated and more aluminum 1060 substrate is exposed. − (HPO 4 2− +H 2 O⇌H 2 PO 4 − +OH − ). However, the favorable properties of aluminum, i.e., low density, high thermal conductivity and good formability, has enabled it as a more attractive candidate container material than OPEN ACCESS

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Section: Electrochemical Impedance Spectroscopy Measurementssupporting

confidence: 68%

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Corrosion behavior of aluminum in molten hydrated salt phase change materials for thermal energy storage

Zhao

Munis

Rehman

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…From the impedance plots semicircles can be observed which indicates that the corrosion process is charge transfer controlled [33]. A common feature observed in the Figs.…”

Section: Resultssupporting

confidence: 52%

Electrochemical Investigation of Erosion-corrosion Behavior of 6061 Aluminum Alloy in Marine Environment

2018

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The liquid-solid erosion-corrosion behavior of aluminum in artificial seawater medium at open circuit has been investigated using a submerged jet impingement rig. The aluminum alloy 6061 coupons subjected to erosion corrosion condition were placed normal to the impinging jet. The gap maintained between the nozzle and the specimen was 5mm. In the present study, sea sand was used as an erodent. Erosion corrosion rate was measured using potentiodynamic polarization and electrochemical impedance spectroscopy methods. At a flowrate of 4 lpm passivation was observed in the potentiodynamic polarization plot which was confirmed by the appearance of inductive loop in the Nyquist plot. At higher flowrates no such condition was observed. The system response to impedance studies was characterized by a high frequency capacitive loop and a capacitive loop at the lower frequency. Surface morphology was studied with scanning electron microscopy (semi quantitative analysis) and atomic force microscopy techniques. Elemental mapping was done with electron dispersive X-ray studies. The erosion-corrosion rate increased with increase in the flow rate and temperature. The results of this work will aid in the selection of material for controlled or reduced material loss in sea water circulating equipment' and pipelines.

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“…Impedance spectrum shows large capacitive loop at high frequencies and an inductive loop at low frequencies [22]. High frequency capacitive semicircle is associated with constant phase element (CPE) and while inductive loop is related with the roughness, inhomogeneities of the solid surface [23].…”

Section: Eis Measurementsmentioning

confidence: 99%

Study of SiC/graphite particulates on the corrosion behavior of Al 6065 MMCs using tafel polarization and impedance

Sunitha¹,

Manjunatha²,

Khan³

et al. 2019

SN Appl. Sci.

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Aluminum metal matrix composites (MMC) have better mechanical properties than the alloy because of high strengthto-density ratios. In addition these composites exhibit low co-efficient of thermal expansion, high corrosion resistance. Al 6065 is the base metal selected for corrosion studies. Al 6065 MMCs are prepared by stir casting method. MMCs are prepared with reinforcement of particulates such as SiC and graphite. Composites are prepared by adding 2, 4 wt % of SiC particulates and hybrid composite with equal amount of SiC and graphite. Base metal alloy without adding any reinforcement is also casted in the same manner for comparison. Present research work involves the study of corrosion behavior of Al 6065 MMCs and the base metal alloy in different mediums using tafel polarization technique and Impedance. The corrosion medium used is 0.1 M acid chloride, 0.1 M acid sulphate and neutral chloride solution of 3.5%. The study is also compiled by SEM analysis of the corroded samples which depicts the deteriorated surfaces. Results indicate that Al 6065 hybrid composite is resistant towards corrosion because of its low percentage of graphite.

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Corrosion behavior of 6061/Al-15 vol. pct. SiC(p) composite and the base alloy in sodium hydroxide solution

Cited by 56 publications

References 28 publications

Corrosion behavior of aluminum in molten hydrated salt phase change materials for thermal energy storage

Corrosion behavior of aluminum in molten hydrated salt phase change materials for thermal energy storage

Electrochemical Investigation of Erosion-corrosion Behavior of 6061 Aluminum Alloy in Marine Environment

Study of SiC/graphite particulates on the corrosion behavior of Al 6065 MMCs using tafel polarization and impedance

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