Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti6Al4V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study

J. Hazan; M. Bamberger

doi:10.1007/978-3-030-36296-6_122

Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Green conversion coatings have been developed using oxyanion like permanganate additive (a conversion layer former) to an acidic medium (H₂SO₄). Reduction products of permanganate, mainly MnO₂, occur due to the high standard reduction potential (E_red ⁰ = 1.695 V) for the electrochemical reaction in acid solution. An anodic oxide film by anodization (plasma electrolytic oxidation) has been also performed. The structure obtained for these two protective coatings consists of an outer (porous) layer, observed at high frequencies, and an inner (barrier) layer, at low frequencies in the impedance diagram. An electrical equivalent circuit describing the coated alloy is proposed. Electrochemical corrosion results in the corroding electrolyte (NaCl 3%) of Ti₆Al₄V will be presented and compared to that of a rolled (Ti–0.15% Pd) foil. Finally, semiconductive properties of the passive film formed on the additive manufactured titanium alloy have been investigated. TiO_2−α is an n-type semiconductor having oxygen deficiency that provokes significant change in the electrical conductivity. Mott–Schottky plots (C_SC ⁻² vs. E) have been drawn, and the donor concentration N_D has been determined from the linear part.

Original language	English
Title of host publication	TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings
Editors	Zhiwei Peng, Jiann-Yang Hwang, Jerome Downey, Dean Gregurek, Baojun Zhao, Onuralp Yucel, Ender Keskinkilic, Tao Jiang, Jesse White, Morsi Mahmoud
Pages	1317-1327
Number of pages	11
DOIs	https://doi.org/10.1007/978-3-030-36296-6_122
State	Published - 2020
Event	149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020 - San Diego, United States Duration: 23 Feb 2020 → 27 Feb 2020

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020
Country/Territory	United States
City	San Diego
Period	23/02/20 → 27/02/20

Keywords

Additive manufacturing
Corrosion
Impedance spectroscopy
Protective coatings
Titanium

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/978-3-030-36296-6_122

Cite this

Hazan, J., & Bamberger, M. (2020). Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study. In Z. Peng, J.-Y. Hwang, J. Downey, D. Gregurek, B. Zhao, O. Yucel, E. Keskinkilic, T. Jiang, J. White, & M. Mahmoud (Eds.), TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings (pp. 1317-1327). (Minerals, Metals and Materials Series). https://doi.org/10.1007/978-3-030-36296-6_122

Hazan, J. ; Bamberger, M. / Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study. TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings. editor / Zhiwei Peng ; Jiann-Yang Hwang ; Jerome Downey ; Dean Gregurek ; Baojun Zhao ; Onuralp Yucel ; Ender Keskinkilic ; Tao Jiang ; Jesse White ; Morsi Mahmoud. 2020. pp. 1317-1327 (Minerals, Metals and Materials Series).

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abstract = "Green conversion coatings have been developed using oxyanion like permanganate additive (a conversion layer former) to an acidic medium (H2SO4). Reduction products of permanganate, mainly MnO2, occur due to the high standard reduction potential (Ered 0 = 1.695 V) for the electrochemical reaction in acid solution. An anodic oxide film by anodization (plasma electrolytic oxidation) has been also performed. The structure obtained for these two protective coatings consists of an outer (porous) layer, observed at high frequencies, and an inner (barrier) layer, at low frequencies in the impedance diagram. An electrical equivalent circuit describing the coated alloy is proposed. Electrochemical corrosion results in the corroding electrolyte (NaCl 3%) of Ti6Al4V will be presented and compared to that of a rolled (Ti–0.15% Pd) foil. Finally, semiconductive properties of the passive film formed on the additive manufactured titanium alloy have been investigated. TiO2−α is an n-type semiconductor having oxygen deficiency that provokes significant change in the electrical conductivity. Mott–Schottky plots (CSC −2 vs. E) have been drawn, and the donor concentration ND has been determined from the linear part.",

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Hazan, J & Bamberger, M 2020, Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study. in Z Peng, J-Y Hwang, J Downey, D Gregurek, B Zhao, O Yucel, E Keskinkilic, T Jiang, J White & M Mahmoud (eds), TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings. Minerals, Metals and Materials Series, pp. 1317-1327, 149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020, San Diego, United States, 23/02/20. https://doi.org/10.1007/978-3-030-36296-6_122

Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study. / Hazan, J.; Bamberger, M.
TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings. ed. / Zhiwei Peng; Jiann-Yang Hwang; Jerome Downey; Dean Gregurek; Baojun Zhao; Onuralp Yucel; Ender Keskinkilic; Tao Jiang; Jesse White; Morsi Mahmoud. 2020. p. 1317-1327 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AB - Green conversion coatings have been developed using oxyanion like permanganate additive (a conversion layer former) to an acidic medium (H2SO4). Reduction products of permanganate, mainly MnO2, occur due to the high standard reduction potential (Ered 0 = 1.695 V) for the electrochemical reaction in acid solution. An anodic oxide film by anodization (plasma electrolytic oxidation) has been also performed. The structure obtained for these two protective coatings consists of an outer (porous) layer, observed at high frequencies, and an inner (barrier) layer, at low frequencies in the impedance diagram. An electrical equivalent circuit describing the coated alloy is proposed. Electrochemical corrosion results in the corroding electrolyte (NaCl 3%) of Ti6Al4V will be presented and compared to that of a rolled (Ti–0.15% Pd) foil. Finally, semiconductive properties of the passive film formed on the additive manufactured titanium alloy have been investigated. TiO2−α is an n-type semiconductor having oxygen deficiency that provokes significant change in the electrical conductivity. Mott–Schottky plots (CSC −2 vs. E) have been drawn, and the donor concentration ND has been determined from the linear part.

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Hazan J, Bamberger M. Corrosion and Protection (Conversion Coating and Plasma Electrolytic Oxidation) of Ti₆Al₄V Processed by Powder Bed Fusion—Additive Manufacturing. EIS Study. In Peng Z, Hwang JY, Downey J, Gregurek D, Zhao B, Yucel O, Keskinkilic E, Jiang T, White J, Mahmoud M, editors, TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings. 2020. p. 1317-1327. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-030-36296-6_122