Electrochemical behavior of mechanically alloyed hard Cu-Al alloys in marine environment

Shaik, Mahammad Ali; Syed, Khader Hussain; Golla, Brahma Raju

doi:10.1016/j.corsci.2019.03.043

Cited by 30 publications

(13 citation statements)

References 41 publications

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“…The same trend was observed for all investigated samples: EOC values shift towards more negative values over time. Similar behaviour was observed for Cu and Cu alloys in NaCl solutions in the literature [5,7,16,18,31,36]. Alfantasi et al [18] attributed this behaviour to breakdown of the oxide film, exposing underlying Cu alloy surfaces to the electrolyte and can lead to the dealloying and simultaneous dissolution of Cu and Al or Zn in Cu-Al and Cu-Zn alloys.…”

Section: Figuresupporting

confidence: 70%

“…Corrosion parameters, such as corrosion potential (Ecorr), values of anodic and cathodic Tafel slopes (ba and bc), and corrosion current density (icorr), are determined by polarization curve analysis, and the obtained values for each sample are shown in Table 2. Polarization resistance (Rp) values were calculated using the Stern-Geary equation [44] (7) and are also shown in Table 2.…”

Section: Figurementioning

confidence: 99%

“…The corrosion surface of Cu-Al alloys may be composed of different products (Cu2O, CuCl2, Al2O3, AlCl4, etc.) [7]. Al reacts with Clions and forms AlCl4 -, according to equation (8).…”

Section: Figurementioning

confidence: 99%

“…Stress-corrosion fatigue resistance of Cu-Al alloys exceeds that of austenitic stainless steels. Additionally, they can be machined or ground and are readily weldable [4,6,7]. Upon addition of Ni or/and Mn to Cu-Al alloys, new alloys can be produced that exhibit specific properties, including Cu shape memory alloys (SMAs).…”

Section: Introductionmentioning

confidence: 99%

“…Addition of aluminium to a Cu-based alloy increases its corrosion resistance due to the formation of a protective alumina (Al2O3) layer, along with Cu2O, which builds up quickly on the surface exposed to the corrosive environment. The formation of these stable passive layers on Cu-Al alloys is mainly due to the higher affinity of aluminium towards oxygen than copper in salt solution and considerable stability of Al2O3 over Cu2O [7,21,22]. Cu-Ni alloys have been widely studied in NaCl solutions, but published results regarding the dissolution process are contradictory.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of corrosion behaviour of copper and copper alloys in aqueous chloride solution

Gudić

Vrsalović

Radeljić

et al. 2021

CI&CEQ

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A comparative corrosion study of Cu and Cu-Al, Cu-Al-Ni, Cu-Al-Mn, and Cu-Al-Mn-Ni in 0.5 mol dm-3 NaCl solution was performed using an open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements (EIS). Scanning electron microscopy/Energy-dispersive X-ray spectroscopy (SEM/EDS) analysis was used to evaluate corrosive damage on the sample surface after polarization measurements. The reported results suggest that the alloying elements have reduced cathodic and anodic current densities in the Tafel region, increased anodic currents at higher anodic potentials, and slightly displaced corrosion potential towards more positive values. Overall, impedance increases in the following order: Cu < Cu-Al < Cu-Al-Ni < Cu-Al-Mn < Cu-Al-Mn-Ni. This indicates that Cu alloys possess better corrosion resistance. SEM and EDS analysis after polarization measurements showed uniform dissolution of pure Cu, as well as the presence of a surface oxide layer, consisting of a mixture of the corresponding alloying elements, on all investigated alloys. Aggressive anodic polarization severely damaged the barrier layers on the Cu alloy specimens.

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Section: Figuresupporting

confidence: 70%

Section: Figurementioning

confidence: 99%

“…The corrosion surface of Cu-Al alloys may be composed of different products (Cu2O, CuCl2, Al2O3, AlCl4, etc.) [7]. Al reacts with Clions and forms AlCl4 -, according to equation (8).…”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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