Evaluation of the corrosion behavior of the al-356 alloy in NaCl solutions

Rendón, Mauricio Vásquez; Calderón, Jorge A.; Fernández, Patricia

doi:10.1590/s0100-40422011000700011

Cited by 13 publications

(12 citation statements)

References 14 publications

(14 reference statements)

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“…Figure 7a presents the electric potential distribution along the metallic surfaces (top view) for an electrolyte thickness of 50 µm. Compared with the reported corrosion potentials of zinc, the AA and steel (−1.08, −0.74, and −0.65 V vs. SCE, respectively [10][11][12] ), the zinc surface is the only one found to be anodically polarized. It thus sustains accelerated degradation effects (the AA and steel are either at their corrosion potential or at more negative potential values).…”

Section: Resultsmentioning

confidence: 78%

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Numerical simulation of the aluminum–zinc–steel galvanic system for new designs of automotive chassis

Ruíz-García

Mayén-Mondragón

Genescá

et al. 2019

Materials & Corrosion

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The requirement for lighter vehicles in the automotive industry promotes designs based on the combination of different metallic alloys. Such an approach, however, leads to galvanic‐corrosion risks, which compromise the durability of vehicles. One proposal to minimize such risks is to separate some of the chassis components by a Zn washer. The present work uses the finite element method to evaluate such an innovative design. The capacity of the washer to protect its aluminum alloy and carbon steel neighbors is assessed. As a worst‐case scenario, the bare metals are in contact with NaCl solution. Two electrolyte layer thicknesses are assumed: in the micrometer and in the millimeter range. Each case requires different mathematical models. For the thin film case, the zinc washer is able to protect its neighbors from corrosion. However, it sustains large corrosion rates, and thus its protection is effective only during short periods. Furthermore, as the Zn surface degrades and thus recesses, the “protective field” is blocked by the neighboring metal‐walls. The thicker the electrolyte layer, the weaker the Zn protective capability and, at some point, the corrosion of the aluminum alloy is unavoidable.

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Section: Resultsmentioning

confidence: 78%

“…All boundaries can be considered electrically insulated Figure 2 shows the modified problem domain. The modeled metallic materials were for this case an Al-356 alloy, [10] pure zinc (99.99%), [11] and XC35 CS. [12] Two different electrolyte thicknesses were considered for the calculations: 5 and 50 µm.…”

Section: Thick-electrolyte-layer Modelmentioning

confidence: 99%

Numerical simulation of the aluminum–zinc–steel galvanic system for new designs of automotive chassis

Ruíz-García

Mayén-Mondragón

Genescá

et al. 2019

Materials & Corrosion

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“…At low frequencies, because of the high dispersion, there is no steady state in the impedance diagram, and it is challenging to observe the inductive loop. Some authors suggest significantly increased stabilization times up to 96 h to reach steady state [30]. All three spectra demonstrate the inductive character in the Nyquist plot.…”

Section: Resultsmentioning

confidence: 87%

Corrosion Resistance of Al–CNT Metal Matrix Composites

et al. 2021

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The design of aluminium–graphite metal matrix composites (MMCs) with advanced mechanical properties and high corrosion resistance is in demand for aerospace, transportation, and industrial applications. Breakthroughs in this field are limited due to the tendency of aluminium–graphite MMCs to corrode. In the present research, aluminium-based MMCs were produced by a relatively novel combined two-staged method. Multiwall carbon nanotubes (MWCNTs) were added into molten Al1070 and processed by high-pressure die casting followed by cyclic extrusion. For the composites produced by this method, it was previously demonstrated that mechanical properties are improved in comparison with pure aluminium alloys. In the current study, the manufactured Al–MWCNT composites were investigated by electrochemical tests (such as open circuit potential), potentiodynamic tests, linear polarization tests, and electrochemical impedance spectra to understand the corrosion resistance of the obtained composite material. The experimental testing of the corrosion resistance of Al–MWCNT MMCs showed that due to the advantages of the fabrication method, the addition of CNTs to aluminium does not cause a radical decrease of corrosion resistance.

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“…is modification was strongly dependent on the density of the current and consequently would concern the state of the metal/solution's interphase. is irregular development was possibly caused by two factors: the first is the phenomenon of passivation of aluminum electrodes, reported by several authors [19,32,38]; the second is due to the chloride ions from the KCl supporting electrolyte [39][40][41]. Several authors have suggested that aluminum undergoes a passivation phenomenon due to the formation of a layer of Al 2 O 3 oxide on the surface of the metal.…”

Section: Effect Of Current Density Jmentioning

confidence: 99%

Optimization of Physicochemical Parameters during the Electrocoagulation Cadmium Elimination

Aityoub

Abouelfida

Benyaich

et al. 2020

Journal of Chemistry

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The increased use of fertilizers from phosphates in agriculture generates water pollution by heavy metals contained in these phosphates at levels higher than the standards. In our study, we used a cadmium nitrate Cd(NO3)2 solution to simulate artificially polluted water, whose decontamination efficiency will be evaluated by an electrocoagulation/flotation process. During this work, we aimed to optimize the electrocoagulation process according to the following factors: initial pH of the solution, density of the electrolysis current, cell time, and nature of the supporting electrolyte and its concentration. The criteria adopted during the optimization of the process are relatively different from those used in similar studies. Indeed, we have tried to achieve maximum efficiency and also seeking to minimize costs and facilitate implementation. We achieved a 98% Cd removal efficiency from the solution at pH = 7, J = 6.25 A/m2, t = 10 min, and [K2SO4] = 0.01 M. In addition, during the characterization of the flocs obtained as a supernatant, we first highlighted the presence of Cd in this gelatinous body and then the relatively easy volatility of Cd as well as that of aluminum oxide (Al2O3).

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Evaluation of the corrosion behavior of the al-356 alloy in NaCl solutions

Cited by 13 publications

References 14 publications

Numerical simulation of the aluminum–zinc–steel galvanic system for new designs of automotive chassis

Numerical simulation of the aluminum–zinc–steel galvanic system for new designs of automotive chassis

Corrosion Resistance of Al–CNT Metal Matrix Composites

Optimization of Physicochemical Parameters during the Electrocoagulation Cadmium Elimination

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