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One of the remarkable features of plasma electrolyte coatings is the presence of micro pores and cracks on the coating surface. Plasma electrolytic oxide coatings are generally recognized for high hardness, wear resistance, and corrosion resistance. However, the coating properties are highly
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to investigate the fundamental electrical and plasma physical processes involved in this process, having previously elucidated some of the micromechanical (& pore architectural), mechanical and thermal characteristics of PEO coatings.
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occur. These discharges result in localized plasma reactions, with conditions of high temperature and pressure which modify the growing oxide. Processes include melting, melt-flow, re-solidification,
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to the substrate metal. A wide range of substrate alloys can be coated, including all wrought aluminum alloys and most cast alloys, although high levels of silicon can reduce coating quality.
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428:, whereas coatings on the 5XXX series have less of this important constituent and are hence softer. Extensive work is being pursued by Prof. T. W. Clyne at the
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dependent on the substrate used, as well as on the composition of the electrolyte and the electrical regime used (see 'Equipment used' section, above).
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are applied. For example, in the plasma electrolytic oxidation of aluminum, at least 200 V must be applied. This locally exceeds the
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modifies the structure of the oxide layer. This process can be used to grow thick (tens or hundreds of micrometers), largely
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and densification of the growing oxide. One of the most significant effects, is that the oxide is partially converted from
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Curran, J; Clyne, T (2005). "The thermal conductivity of plasma electrolytic oxide coatings on aluminium and magnesium".
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Curran, J; Clyne, T (2005). "Thermo-physical properties of plasma electrolytic oxide coatings on aluminium".
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Potentials of over 200 V are applied between these two electrodes. These may be continuous or pulsed
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or "pulsed bi-polar" operation) where the stainless steel counter electrode might just be
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oxide layer which provides moderate protection against corrosion. The layer is strongly
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Curran, J.A.; Clyne, T.W. (2006). "Porosity in plasma electrolytic oxide coatings".
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Ibrahim, H.; Esfahani, S. N.; Poorganji, B.; Dean, D.; Elahinia, M. (January 2017).
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Even on aluminium, the coating properties can vary strongly according to the exact
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composition. For instance, the hardest coatings can be achieved on 2XXX series
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such as KOH. It is electrically connected, so as to become one of the
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to the metal surface, and it will regrow quickly if scratched off. In
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and a continuous barrier, these coatings can offer protection against
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Dunleavy, C.S.; Golosnoy, I.O.; Curran, J.A.; Clyne, T.W. (2009).
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A typical PEO surface on aluminium, as viewed in an
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384:in DC operation), or alternating pulses (
298:In plasma electrolytic oxidation, higher
273:Metals such as aluminum naturally form a
106:Learn how and when to remove this message
631:Plasma Electrolytic Oxidation:WikiBooks
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496:Materials Science and Engineering: C
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44:adding citations to reliable sources
354:which usually consists of a dilute
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191:. Because they can present high
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602:Surface and Coatings Technology
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462:Surface and Coatings Technology
322:into crystalline forms such as
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31:needs additional citations for
614:10.1016/j.surfcoat.2004.11.045
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304:dielectric breakdown potential
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127:electrolytic plasma oxidation
119:Plasma electrolytic oxidation
230:undergoing PEO processing.
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171:occur and the resulting
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656:Metallurgical processes
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148:process for generating
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238:installed on a yacht.
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205:electrical insulation
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386:alternating current
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203:or heat as well as
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33:verification
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573:(7): 1985.
352:electrolyte
293:electrolyte
275:passivating
234:a finished
177:crystalline
640:Categories
437:References
363:electrodes
308:discharges
300:potentials
236:winch drum
228:winch drum
169:discharges
167:, so that
165:potentials
96:April 2017
66:newspapers
340:toughness
317:amorphous
313:sintering
289:potential
255:substrate
201:corrosion
185:magnesium
181:aluminium
161:anodizing
141:), is an
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414:corundum
359:solution
356:alkaline
324:corundum
279:adherent
263:adhesion
226:A yacht
193:hardness
189:titanium
153:coatings
575:Bibcode
390:earthed
365:in the
320:alumina
269:Process
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232:Below;
173:plasma
157:metals
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187:and
59:news
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