A microscopic study on the corrosion fatigue of ultra-fine grained and conventional Al–Mg alloy

Sharma, Mala M.; Tomedi, Josh D.; Parks, Jeffery M.

doi:10.1016/j.corsci.2015.01.020

Cited by 39 publications

(22 citation statements)

References 68 publications

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“…It is probably because the chemical composition can play a more significant role than porosity in corrosion activity [31]. Al-Mg alloys with Mg content greater than *3.5 wt% become supersaturated at temperatures lower than *200°C [32], and this can lead to the deleterious precipitation of b-phase (Al 3 Mg 2 or Al 8 Mg 5 ) which is anodic with Al-Mg alloy matrix and promote rapid pitting corrosion through galvanic interaction [33]. The corrosion potential was the most negative in the Al5Mg spray coating layer, followed by Al-3Mg and Al.…”

Section: Resultsmentioning

confidence: 99%

“…However, this concentration also forms an abundance of the b-phases (Al 3 Mg 2 , Al 8 Mg 5 , Mg 2 Al 3 ) which are known to be deleterious in the corrosion performance. Because the b-phase is anodic, its presence enhances the selective dissolution on the coating surface, thus creating sites for deep pits in seawater [8][9][10][11]33]. The local corrosion type of Al-5Mg spray coating layer lowers the efficiency of sacrificial anode and will have the negative effect on the sacrificial anode for corrosion protection [37].…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Park

Kim

2016

Acta Metall. Sin. (Engl. Lett.)

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For corrosion protection of carbon steel in a marine environment, cold arc thermal spray coating was applied to the surface with Al and Al-Mg alloy wires. The surface hardness of Al and Al-Mg thermal spray coatings increased with Mg content. And the various electrochemical experiments were carried out to evaluate corrosion damage characteristics of the thermal spray coating layers. The Al and Al-Mg thermal spray coating layers presented negative potentials compared to carbon steel in corrosion potential measurements. And an anodic polarization experiment revealed a tendency of activation polarization with no passivation. Furthermore, the corrosion damage of the thermal spray coating layer in galvanostatic experiment was observed mainly at the defect area, and the Al-3Mg thermal spray coating layer presented less surface damages than others. In addition, the Al-3Mg thermal spray coating layer showed the lowest corrosion rate while having a sufficient driving voltage for cathodic corrosion protection. Therefore, it is an optimal thermal spray material for sacrificial anode.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Park

Kim

2016

Acta Metall. Sin. (Engl. Lett.)

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“…G20Mn5QT cast steel exhibits a different fatigue behaviour in laboratory air and in 3.5‐wt% NaCl solution. To further interpret this performance, the fatigue strength values in laboratory air ( S AIR ) and in 3.5‐wt% NaCl solution ( S COR ) are derived with equal fatigue life from the fatigue S ‐ N curves (Equations and . The relationships of the fatigue strengths are plotted in Figures and .…”

Section: Discussionmentioning

confidence: 99%

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Han

Wang

2019

Fatigue Fract Eng Mat Struct

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Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel are investigated in simulated seawater. Fractography is performed by using scanning electron microscopy (SEM). The macroscale fracture surface and microstructure of the failed specimen are acquired including the crack initiation, crack propagation, and pitting evolution. The maximum cyclic stress (S) versus number of cycles to failure (N) curves is derived by three‐parameter fatigue curve method. Fatigue life is predominantly controlled by the corrosion pitting‐induced crack initiation when tested in simulated seawater at lower stress levels. As the maximum cyclic stress is less than 185 MPa, the chloride ion erosion is the main influence factor, which affects the fatigue failure of the G20Mn5QT cast steel in simulated seawater.

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“…The most popular alloying elements of aluminum are silicon and magnesium (alloys of 5XXX and 4XXX series), which are added to improve some of the base metal's mechanical properties [3][4][5][6][7][8][9], but unfortunately reduce its corrosion resistance [10]. It is well known that the surface of aluminum and its alloys is covered with a native oxide film that naturally develops in air, under ordinary conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Degradability of Al-20% Mg and Al-22% Si Alloys in an Acidic Environment in Relation with their Microstructure

Slimane¹,

Kellou-Kerkouche²

2020

Port. Electrochim. Acta

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The electrochemical degradability of Al-20% Mg and hypereutectic Al-22% Si industrial alloys was evaluated in an aggressive acidic environment, namely 1 M H2SO4, using potentiodynamic polarization, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques. The microstructure and constituting phases of the surface alloys were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), coupled with Energy Dispersive X-ray Spectroscopy (EDX). It was found that the two alloys' corrosion behavior mainly depends on their crystalline phases. The presence of the active intermetallic β-Al3Mg2 phase in the Al alloy with high Mg content induced a preferential Mg dissolution, which caused a severe intergranular attack on this alloy by the corrosive solution. Meanwhile, the Al alloy containing high Si content, which presented the eutectic Al-Si phase, showed a uniform and weaker dissolution. It was also observed that a rise in temperature reduced the corrosion performance of the two studied alloys, as these corroded faster than pure aluminum.

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A microscopic study on the corrosion fatigue of ultra-fine grained and conventional Al–Mg alloy

Cited by 39 publications

References 68 publications

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Electrochemical Degradability of Al-20% Mg and Al-22% Si Alloys in an Acidic Environment in Relation with their Microstructure

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