An investigation of the electrochemical polarisation behaviour of 6061 aluminium metal matrix composites

Griffiths, A J; Turnbull, A.

doi:10.1016/0010-938x(94)90106-6

Cited by 34 publications

(16 citation statements)

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“…The corrosion behavior of Al-based MMCs has been extensively C studied. [5][6][7][8][9][10][11] A review of corrosion studies on aluminum MMCs based on silicon carbide, graphite, alumina, and boron reinforcements can be found in Turnbull's [12] review article. In general, the reinforcement may introduce imperfections in the surface oxide on the matrix surface, and preferential attack occurs due to galvanic couples, active reaction products, intermetallic particles, microvoids, and microcrevices at reinforcement/matrix interfaces.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Fang

Huang

Chuang

1999

Metall Mater Trans A

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Wear corrosion of alumina particulate-reinforced 6061 aluminum matrix composites in a 3.5 wt pct NaCl solution with a revised block-on-ring wear tester has been investigated. The studies involved the effects of applied load, rotational speed, and environments (dry air and 3.5 pct NaCl solution) on the wear rates of materials. Also various specimens with Al 2 O 3 volume fractions of 0, 10, 15, and 20 pct were employed in this work. Electrochemical measurements and electron micrographic observations were conducted to clarify the micromechanisms of wear corrosion in such metal matrix composites. Experimental results indicated that the wear rate of monolithic 6061 Al in either dry wear or wear corrosion was reduced by adding alumina reinforcements. However, the effect of volume fraction on wear rate is only minor in dry wear, while it is significant in the case of wear corrosion. Wear-corrosion tests also showed that the corrosion potential shifted to the active side and the current density for an applied potential increased with the decrease of Al 2 O 3 volume fraction in the materials and the increase in applied load and rotational speed. Although the incorporation of reinforcement in these aluminum matrix composites was deterimental to their corrosion resistance, the influence on wear corrosion was favorable.

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Section: Introductionmentioning

confidence: 99%

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Fang

Huang

Chuang

1999

Metall Mater Trans A

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“…The large variation in resistivity of the SiC may be the cause for conflicting results in the literature on the corrosion of Al/SiC MMCs. For example, no obvious evidence of galvanic corrosion was found in Al 6061/SiC MMCs with 17-27 vol % SiC particles [87].…”

Section: D13 Aluminum/silicon Carbide Mmcs the Al/sicmentioning

confidence: 99%

“…The presence of SiC particles does not have a significant effect on the aluminum matrix passive current densities [84,86,88,89] and pitting potentials [80,[86][87][88][90][91][92][93][94][95]. Pit morphology, however, is indirectly affected by the presence of SiC particles.…”

Section: D13 Aluminum/silicon Carbide Mmcs the Al/sicmentioning

confidence: 99%

“…The pits nucleated at intermetallic particles (not SiC), which are smaller and more numerous in the MMCs than in the monolithic matrix alloys [96]. SiC whiskers [96] and particles [87] can enhance the precipitation of the intermetallic phases. Pitting has also been observed at dendrite cores [97], near-eutectic silicon [94,98], and intermetallic particles [98] in various Al/SiC MMCs.…”

Section: D13 Aluminum/silicon Carbide Mmcs the Al/sicmentioning

confidence: 99%

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Metal–Matrix Composites

Hihara

2011

Uhlig's Corrosion Handbook

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“…Pitting corrosion often occurs in ceramic particulate reinforced Al-based MMCs. [6][7][8][9][10][11][12][13][14][15][16] Pitting is more serious for Al-based MMCs compared to unreinforced alloys. Corrosion resistance of Al-based composites is influenced by several factors such as processing conditions, microstructure, chemical composition and heat treatment, size and volume fraction of the reinforcing ceramic particulates, chloride content of the environment, etc.…”

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confidence: 99%

Corrosion Behavior of Al‐based Composites Containing In‐situ TiB₂, Al₂O₃ and Al₃Ti Reinforcements in Aerated 3.5 % Sodium Chloride Solution

Huo

Tjong

2007

Adv Eng Mater

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Aluminum-based metal-matrix composites (MMCs) reinforced with ceramic particulates exhibit high strength and elastic modulus, excellent wear resistance, near-isotropic and good high-temperature mechanical properties. [1][2][3][4] They have been used as structural materials in the automotive, aerospace and transportation industries. They are also very attractive for use as impellers and agitators in marine environments. [5] Poor corrosion resistance is a key issue for using these structural materials in marine environments. Pitting corrosion often occurs in ceramic particulate reinforced Al-based MMCs. [6][7][8][9][10][11][12][13][14][15][16] Pitting is more serious for Al-based MMCs compared to unreinforced alloys. Corrosion resistance of Al-based composites is influenced by several factors such as processing conditions, microstructure, chemical composition and heat treatment, size and volume fraction of the reinforcing ceramic particulates, chloride content of the environment, etc. The pits are commonly initiated at the flaws or heterogeneities in the passive film due to the presence of ceramic particulates and intermetallic precipitates in the MMCs. Corrosion attacks are known to occur preferentially in the vicinity of reinforcing particles or the reinforcementmatrix interface. [13,14] In addition, ceramic reinforcements also enhance precipitation of the intermetallics, promoting more pit nucleation in the composites. [8,9] For conventional Al-based MMCs fabricated via powder metallurgy route, ceramic particulates are prepared separately prior to their incorporation into aluminum matrix. Therefore, the size of reinforcements depends greatly on the initial powder diameter, typically in the order of several to tens of micrometers. Large ex-situ ceramic particles often act as stress concentrators during mechanical loading, leading to premature failure of composites. Moreover, fractured ceramic particles also serve as pit nucleation sites for the MMCs immersed in chloride containing solutions. [10] Therefore, many efforts have been directed towards the in-situ formation of ultrafine ceramic particles with uniform dispersion in metal matrices of the composites. Several techniques have been developed including exothermic dispersion (XD), reactive hot pressing (RHP), combustion-assisted cast, direct reaction synthesis, and liquid-solid or liquid-liquid reaction. [17][18][19][20][21] Among these, RHP process is attractive due to their simplicity and flexibility. Ultrafine ceramic particulates can be formed in-situ by the exothermic reaction between the element constituents of composites under hot pressing conditions. [1,19] The in-situ formed ceramic particulates exhibit thermodynamic compatibility with aluminum. The reinforcement-matrix interfaces are clean, resulting in a stronger particle-matrix bonding. The structure and mechanical behavior of Al-based MMCs reinforced with in-situ ceramic particulates are well established. [1,[18][19][20][21] However, there is no information available in the literature concerning t...

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An investigation of the electrochemical polarisation behaviour of 6061 aluminium metal matrix composites

Cited by 34 publications

References 3 publications

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Metal–Matrix Composites

Corrosion Behavior of Al‐based Composites Containing In‐situ TiB₂, Al₂O₃ and Al₃Ti Reinforcements in Aerated 3.5 % Sodium Chloride Solution

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An investigation of the electrochemical polarisation behaviour of 6061 aluminium metal matrix composites

Cited by 34 publications

References 3 publications

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Synergistic effects of wear and corrosion for Al2O3 particulate-reinforced 6061 aluminum matrix composites

Metal–Matrix Composites

Corrosion Behavior of Al‐based Composites Containing In‐situ TiB2, Al2O3 and Al3Ti Reinforcements in Aerated 3.5 % Sodium Chloride Solution

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Corrosion Behavior of Al‐based Composites Containing In‐situ TiB₂, Al₂O₃ and Al₃Ti Reinforcements in Aerated 3.5 % Sodium Chloride Solution