Initial stages of AZ91 Mg alloy micro-arc anodizing: Growth mechanisms and effect on the corrosion resistance

Veys‐Renaux, Delphine; Rocca, Emmanuel; Martin, Julien; Henrion, G.

doi:10.1016/j.electacta.2013.08.023

Cited by 50 publications

(27 citation statements)

References 33 publications

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“…As MAO films are obtained under a cyclic process of film-forming, breakdown, melting, sintering and film-forming again [15]. Spark discharge occurs first at the weak locations of the films (such as defects and thin sites) during the increase of oxidation voltages [16,17]. Plasma groups flow out through the discharge channels, similar to a volcanic eruption, and then are cooled rapidly by the solution [18].…”

Section: Investigation Of Corrosion Behavior By Immersion Testsmentioning

confidence: 99%

Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

et al. 2015

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Section: Investigation Of Corrosion Behavior By Immersion Testsmentioning

confidence: 99%

Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

et al. 2015

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“…However, the use of a simple DC electric regime allows both a better understanding of the electrochemical behavior of materials in the high voltage range and a simplification of the process [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of zinc in KOH media at high voltage: Micro-arc oxidation of zinc

Rocca

Veys‐Renaux

Guessoum

2015

Journal of Electroanalytical Chemistry

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“…As previously shown with magnesium alloys [12,13] or titanium [14,15], the sparking phenomenon is dependent on the electrochemical properties and composition of the oxide layer formed during the classical anodizing phase before the dielectric breakdown voltage.…”

Section: Introductionmentioning

confidence: 86%

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

Veys‐Renaux

Rocca

2015

J Solid State Electrochem

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International audienceThe electrochemical behaviour of AA1050 and AA2214 alloys was studied in a KOH/silicate in order to investigate the first stages of the coating formation during MAO process (by SEM and electrochemical measurements). Before the sparking initiation, occurring around 300 V for both alloys, a thin inner layer of aluminium oxide grows by a classical anodizing mechanism, and induces a great enhancement of the electrochemical resistance. Then, the micro-arc regime beyond 300 V leads to the formation of a dense, thicker but cracked external aluminium oxide layer. Afterwards, from 400 V, a sharp increase of current density named ``current wall'' and due to an increase of oxide conductivity, leads to a significant oxygen release and the occurrence of large and energetic sparks. Microscopic analyses reveal that the presence of copper-rich intermetallic phases in the multi-phased alloy (AA2214) induces the incorporation of copper nanoparticles in the gamma-alumina layer formed by the sparking phenomenon. These copper particles increase the reaction of water oxidation during the classical anodizing stage, and result in a delay of the sparking initiation during the galvanostatic anodizing and in a lower electrochemical resistance of the anodized layers

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Initial stages of AZ91 Mg alloy micro-arc anodizing: Growth mechanisms and effect on the corrosion resistance

Cited by 50 publications

References 33 publications

Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

Electrochemical behavior of zinc in KOH media at high voltage: Micro-arc oxidation of zinc

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

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