New findings on properties of plasma electrolytic oxidation Coatings from study of an Al-Cu-Li alloy

Ying Liang Cheng; Zhi Gang Xue; Qun Wang; Xiang Quan Wu; E. Matykina; P. Skeldon; G. E. Thompson

doi:10.1016/j.electacta.2013.06.022

New findings on properties of plasma electrolytic oxidation Coatings from study of an Al-Cu-Li alloy

Ying Liang Cheng, Zhi Gang Xue, Qun Wang, Xiang Quan Wu, E. Matykina, P. Skeldon, G. E. Thompson

Research output: Contribution to journal › Article › peer-review

Abstract

Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are γ-Al 2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of δ-Al2O3 and α-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. © 2013 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	358-378
Number of pages	20
Journal	Electrochimica Acta
Volume	107
DOIs	https://doi.org/10.1016/j.electacta.2013.06.022
Publication status	Published - 30 Sept 2013

Keywords

Al-Cu-Li alloy
Cuprite
Discharge types
Dry sliding wear
Plasma electrolytic oxidation

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10.1016/j.electacta.2013.06.022

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title = "New findings on properties of plasma electrolytic oxidation Coatings from study of an Al-Cu-Li alloy",

abstract = "Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are γ-Al 2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of δ-Al2O3 and α-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. {\textcopyright} 2013 Elsevier Ltd. All rights reserved.",

keywords = "Al-Cu-Li alloy, Cuprite, Discharge types, Dry sliding wear, Plasma electrolytic oxidation",

author = "Cheng, {Ying Liang} and Xue, {Zhi Gang} and Qun Wang and Wu, {Xiang Quan} and E. Matykina and P. Skeldon and Thompson, {G. E.}",

year = "2013",

month = sep,

day = "30",

doi = "10.1016/j.electacta.2013.06.022",

language = "English",

volume = "107",

pages = "358--378",

journal = "Electrochimica Acta",

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TY - JOUR

T1 - New findings on properties of plasma electrolytic oxidation Coatings from study of an Al-Cu-Li alloy

AU - Cheng, Ying Liang

AU - Xue, Zhi Gang

AU - Wang, Qun

AU - Wu, Xiang Quan

AU - Matykina, E.

AU - Skeldon, P.

AU - Thompson, G. E.

PY - 2013/9/30

Y1 - 2013/9/30

N2 - Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are γ-Al 2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of δ-Al2O3 and α-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. © 2013 Elsevier Ltd. All rights reserved.

AB - Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are γ-Al 2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of δ-Al2O3 and α-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. © 2013 Elsevier Ltd. All rights reserved.

KW - Al-Cu-Li alloy

KW - Cuprite

KW - Discharge types

KW - Dry sliding wear

KW - Plasma electrolytic oxidation

U2 - 10.1016/j.electacta.2013.06.022

DO - 10.1016/j.electacta.2013.06.022

M3 - Article

SN - 0013-4686

VL - 107

SP - 358

EP - 378

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

New findings on properties of plasma electrolytic oxidation Coatings from study of an Al-Cu-Li alloy

Abstract

Keywords

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