Effect of grain size on corrosion of high purity aluminium

Ralston, Kevin; Fabijanic, Daniel; Birbilis, Nick

doi:10.1016/j.electacta.2010.09.023

Cited by 335 publications

(156 citation statements)

References 30 publications

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“…The average value of E pit for Al in 0.1 M NaCl is -0.670 V sce ± 20 mV. 31,39,43,61,67,73,80 Maitra and Verink report that the amount of Cl − increased as polarization time increased (0.5 to 24 hours). Also, sputter profiling showed that the Cl − was present in the oxide film and that the Cl − signal diminished as the oxide/metal interface was approached.…”

Section: Experimental Evidence For Chloride Incorporation In the Oxidmentioning

confidence: 99%

Chloride Ion Interactions with Oxide-Covered Aluminum Leading to Pitting Corrosion: A Review

Natishan

O’Grady

2014

J. Electrochem. Soc.

238

122

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Metals and alloys such as aluminum (Al), stainless steels, and nickel-based alloys exhibit corrosion resistance in a wide range of environments due to the presence of protective, passive oxides. However, in environments that contain aggressive anions such as chloride, Cl − , the passive film becomes unstable and degrades locally causing film breakdown and pitting corrosion. A number of theories describing the initiation of pitting corrosion have been postulated and discussed but to date there is no consensus on the mechanism of breakdown. Since all current mechanisms require Cl − interactions for oxide film breakdown in Cl − containing environments, the question is what is the nature of the interaction of aggressive anions such as Cl − with the passive film, adsorption and/or absorption, leading to pitting? This communication focuses on the interaction of Cl − with the passive oxide film on pure aluminum by reviewing and summarizing the available experimental data concerning Cl − interactions. It should also be noted that the observations for Cl − interactions with Al reviewed and summarized herein might not be applicable to all metals and alloys. Technologically important metals and alloys such as aluminum (Al), stainless steels, and nickel-based alloys exhibit corrosion resistance in a wide range of environments due to the presence of protective, passive oxides.1-90 The passive oxides behave as kinetic barriers, which inhibit further oxidation of the underlying thermodynamically reactive metals. However, in environments that contain aggressive anions such as chloride, Cl − , the passive film becomes unstable and degrades locally causing film breakdown and localized corrosion, which in turn decreases the service life of the materials. The consequence of discrete oxide failure is localized corrosion, which occurs in the forms of crevice corrosion in occluded sites and metastable or stable pitting corrosion on open surfaces. It is generally agreed that localized corrosion occurs in two distinct steps: initiation and propagation.A number of theories describing the initiation of pitting corrosion have been postulated and discussed.

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Section: Experimental Evidence For Chloride Incorporation In the Oxidmentioning

confidence: 99%

Chloride Ion Interactions with Oxide-Covered Aluminum Leading to Pitting Corrosion: A Review

Natishan

O’Grady

2014

J. Electrochem. Soc.

238

122

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“…There is a significant body of research regarding the effect of grain-size refinement on the corrosion behavior of Al alloys [2][3][4][5][6][7][8][9]. The results of previous investigations clarify that UFG Al alloys show superior resistance to stress corrosion cracking (SCC) and pitting, decreased cathodic kinetics, and higher resistance in mass-loss testing compared with their coarse-grained (CG) counterparts [7,10,11].…”

Section: Introductionmentioning

confidence: 98%

“…The improved corrosion resistance of UFG materials is attributed to their high affinity to passivation resulting from a high density of grain boundaries. Some evidences of passivation were observed in a wide range of UFG Al alloys [4,5]. Increased homogeneous surface energy distribution of UFG materials has been proposed as the main source for the enhanced resistance to pitting [12].…”

Section: Introductionmentioning

confidence: 98%

Significant Corrosion Resistance in an Ultrafine-Grained Al6063 Alloy with a Bimodal Grain-Size Distribution through a Self-Anodic Protection Mechanism

Oskooie

Asgharzadeh

Sadighikia

et al. 2016

Metals

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Abstract:The bimodal microstructures of Al6063 consisting of 15, 30, and 45 vol. % coarse-grained (CG) bands within the ultrafine-grained (UFG) matrix were synthesized via blending of high-energy mechanically milled powders with unmilled powders followed by hot powder extrusion. The corrosion behavior of the bimodal specimens was assessed by means of polarization, steady-state cyclic polarization and impedance tests, whereas their microstructural features and corrosion products were examined using optical microscopy (OM), scanning transmission electron microscopy (STEM), field emission scanning electron microscopy (FE-SEM), electron backscattered diffraction (EBSD), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) techniques. The bimodal Al6063 containing 15 vol. % CG phase exhibits the highest corrosion resistance among the bimodal microstructures and even superior electrochemical behavior compared with the plain UFG and CG materials in the 3.5% NaCl solution. The enhanced corrosion resistance is attributed to the optimum cathode to anode surface area ratio that gives rise to the formation of an effective galvanic couple between CG areas and the UFG matrix. The operational galvanic coupling leads to the domination of a "self-anodic protection system" on bimodal microstructure and consequently forms a uniform thick protective passive layer over it. In contrast, the 45 vol. % CG bimodal specimen shows the least corrosion resistance due to the catastrophic galvanic corrosion in UFG regions. The observed results for UFG Al6063 suggest that metallurgical tailoring of the grain structure in terms of bimodal microstructures leads to simultaneous enhancement in the electrochemical behavior and mechanical properties of passivable alloys that are usually inversely correlated. The mechanism of self-anodic protection for passivable metals with bimodal microstructures is discussed here for the first time.

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“…Himself at home and abroad such as aluminium and its alloy and zinc on corrosion behavior under different atmospheric corrosion medium to carry out the more basic research [1][2][3], but due to the complexity of ACSR conductor composition and structure, the composition of the corrosion behavior and corrosion products, structure more complicated [4].For the first time under laboratory conditions, such as through a cyclical wet/dry salt spray environment under the accelerated corrosion test to study the corrosion behavior of aluminum, steel and galvanized steel, based on the mass loss of the wire to evaluate degree of atmospheric corrosion of the wire, start the transmission wire corrosion behavior of laboratory research by Wang, etc [5]. Zhengyao [6] has been adopting NaHSO3 + NaCI to zinc ion in aqueous solution and aluminum alloy atmospheric corrosion process of research, the main research results and field exposure experiment results are identical with each other [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of shot blasting on Aerial Aluminum Conductor corrosion behavior

Guo¹,

Wang²,

Yu³

et al. 2015

Proceedings of the 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering 2015

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Abstract. Aerial aluminum conductor (ACSR) as the primary overhead lines products, has been running in the field for a long time. The inevitable corrosion will be affected by heavy pollution environment. Salt spray is acknowledged as the natural environment in most demanding of corrosion, which can make the wire obviously brittle and the strength greatly decreased. The resulting in ballooning and broken strands of the wire break will seriously affect the safe and reliable operation of power grid. Steel core aluminum stranded wires with shot blasting on their main body status are hard to shake in the current and future decades, and the shot blasting of ACSR is effective way to improve its corrosion resistance for great significance.

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Effect of grain size on corrosion of high purity aluminium

Cited by 335 publications

References 30 publications

Chloride Ion Interactions with Oxide-Covered Aluminum Leading to Pitting Corrosion: A Review

Chloride Ion Interactions with Oxide-Covered Aluminum Leading to Pitting Corrosion: A Review

Significant Corrosion Resistance in an Ultrafine-Grained Al6063 Alloy with a Bimodal Grain-Size Distribution through a Self-Anodic Protection Mechanism

Effect of shot blasting on Aerial Aluminum Conductor corrosion behavior

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