Corrosion Resistance of Aluminum-Copper Alloys with Different Grain Structures

Román, Alejandra Silvina; Méndez, C. M.; Gervasi, C.A.; Rebak, Raúl B.; Ares, Alicia Esther

doi:10.1007/s11665-020-05344-1

Cited by 11 publications

(8 citation statements)

References 52 publications

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“…Figure 8 shows the Nyquist diagrams obtained from the EIS measurements of the Al-Mg alloys. As it has been reported in other works on aluminum base alloys in chloride-containing solutions, the analysis of impedance data at frequencies lower than 0.1 Hz is difficult, probably due to the non-stationary nature of the pitting phenomenon (Frankel, 2008;Román et al, 2021). Consequently, we have decided not to consider points at frequencies below 0.05 Hz.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

“…The impedance responses were simulated using the equivalent circuit of two nested time constants shown in Figure 10. The use of such a circuit has been reported to explain the behavior of aluminum base alloys as well as Mg base alloys with aluminum coatings (Frankel, 2008;Román et al, 2021;Wei et al, 2021;Ma et al, 2022). R Ω represents the solution resistance.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

“…R 2 and CPE 2, represent the resistance and the capacitance of the barrier layer (Orazem and Tribollet, 2008;Sekularac and Milosev, 2018;Wei et al, 2021). The deviation from the ideal capacitive behavior due to the inhomogeneous interface, is represented by using CPE with coefficients n 1 and n 2 (Román et al, 2021;Ma et al, 2022). The parameters of the impedance settings of the samples studied are presented in Table 3.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

“…In previous works, we correlated the effect of several parameters, like thermal, mechanical and electrochemical ones, on the CET macrostructure of different alloys systems (Ares et al, 2008;Román et al, 2014;Román et al, 2015;Kociubczyk et al, 2015;Ares and Schvezov, 2015;Ares et al, 2016;Rozicki et al, 2018;Kociubzyk et al, 2018;Ares et al, 2018;Ares et al, 2018;Kramer et al, 2016;Méndez et al, 2018;Román et al, 2021). Earlier, we had analyzed the thermal and structural parameters of Al-Mg alloys during the columnar-to equiaxed transition (Al-2wt.%Mg and Al-4wt.% Mg) (Ares et al, 2003a;Ares et al, 2003b;Ares et al, 2004) and the corrosion of Al-Mg alloys exposed to ethanol solutions and bioethanol fuel (Kramer et al, 2017;Gauto et al, 2018;Kramer et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Diluted Al-Mg Alloys With Columnar-To-Equiaxed Transition

et al. 2022

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The objective of the present research is to study the corrosion susceptibility of two Al-Mg diluted alloys (Al-0.5wt.%Mg and Al-2wt.%Mg) with different grains structures obtained by directional solidification (columnar, equiaxed and columnar-to-equiaxed transition, CET) in 0.5% NaCl solution, at room temperature. The corrosion resistance is analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques in both longitudinal and transversal sections of the samples. The columnar grain zone presents higher corrosion resistance than the equiaxed grain zone. In addition, the transversal section shows higher corrosion resistance than the longitudinal section of the samples. Then, the Al-0.5wt.% Mg alloy displays higher corrosion resistance than the Al-2wt.% Mg alloy. The values of the polarization resistance are used as a basic criterion for the evaluation of the corrosion resistance of both alloys. In this way, when the polarization resistance decreases with the increasing in the distance from the base, the grain size, secondary dendritic arm spacings and hardness increases. In addition, when the polarization resistance increases, the critical temperature gradient decreases.

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Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Diluted Al-Mg Alloys With Columnar-To-Equiaxed Transition

et al. 2022

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“…In general, the electrochemical response of the systems will be the result of the combination of the different structures and composition of the alloys. It has been shown that the corrosion behavior of aluminum-based alloys will depend on the nature of the secondary phases, their distribution as a result of the different microstructures, their electrochemical behavior and their interaction with the matrix [12,18,19].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Susceptibility and Microhardness of Al-Ni Alloys with Different Grain Structures

Román,

Ibañez,

Zadorozne

et al. 2023

Preprint

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The development of Al-Ni alloys with a controlled microstructure has had a great impact on the field of study of aluminum-based alloys. In the present research, the influence of thermal parameters on the grain structures resulting from the directional solidification process of Al-Ni alloys with different alloy content has been studied. It has also been evaluated how different structures and the distribution of second phases influence the corrosion behavior and microhardness of alloys. The columnar-to-equiaxed transition (CET) was observed to occur when the temperature gradient in the melt decreased to values between 1.3 to 2.9 ° C/cm. In addition, a small increase in the microhardness values was observed as a function of the Ni-content. When the Ni-content increase, the resistance to polarization decreases for samples with equiaxed grain structure, throughout the range of compositions studied. Furthermore, the equiaxed grain structure presents higher resistance to polarization values than the columnar grain zone, for alloys with a composition equal to or lower than the eutectic composition.

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Comparative study on the corrosion behaviour of CNT-reinforced NiAl alloys in NaCl and Na2SO4 solutions

et al. 2023

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Various electrochemical techniques were used to study the corrosion behaviour of the CNT-reinforced NiAl alloys under NaCl and Na2SO4 environments. The potentiodynamic polarization curves revealed activation Tafel behaviour when the NiAl alloy specimens were immersed in NaCl solution while passivation followed by slight development of transpassivation resulted under Na2SO4 environment. The reinforcement of pure NiAl alloy with up to 1.0 wt.% CNT increased the corrosion rate from 0.10 to 0.63 mm/yr under NaCl environment, while under Na2SO4 environment, the corrosion rate increased from 0.04 to 0.12 mm/yr. The observed increase in corrosion rate with an increase in CNT reinforcement (under both NaCl and Na2SO4 environments) suggested that the reinforcement of NiAl alloys with CNT reduced the corrosion resistance of NiAl. The X-ray diffraction analysis revealed that the corrosion products consisted of oxides including Al2O3 under NaCl environment, while scanning electron microscope analysis showed a porous passive layer on the surface of the alloy specimens immersed in Na2SO4 solution. Graphical abstract

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Corrosion Resistance of Aluminum-Copper Alloys with Different Grain Structures

Cited by 11 publications

References 52 publications

Electrochemical Properties of Diluted Al-Mg Alloys With Columnar-To-Equiaxed Transition

Electrochemical Properties of Diluted Al-Mg Alloys With Columnar-To-Equiaxed Transition

Corrosion Susceptibility and Microhardness of Al-Ni Alloys with Different Grain Structures

Comparative study on the corrosion behaviour of CNT-reinforced NiAl alloys in NaCl and Na2SO4 solutions

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