Microstructure and Corrosion Properties of PEO Coatings Produced on AM-Aluminum Alloys

Luca Pezzato; Manuele Dabalà; Katya Brunelli

doi:10.4028/www.scientific.net/KEM.813.298

Paper Titles

AFM Measurements of the Deformation Kinetics of Silica Oxide Dots Deposited on a Sequentially Nitrided Stainless Steel
p.273

Enhanced Durability of Graphene-Based Epoxy Films
p.279

Effect of Fluoride Addition in Sulfuric Acid-Based Desmutting Solution for Aluminium Alloy AA8006
p.285

A Tribochemical Boost for Cu Based Lubricant Nano-Additive
p.292

Microstructure and Corrosion Properties of PEO Coatings Produced on AM-Aluminum Alloys
p.298

GTAW-Pulsed Refusion Patterns of NiCrBSi Thermal Sprayed Coatings
p.304

Cold Wall CVD Graphene-Based Transparent Electrode for Solar Cells
p.310

Solar Selective Coating for Thermal Applications
p.316

Osteoblast Cell Response to LIPSS-Modified Ti-Implants
p.322

HomeKey Engineering MaterialsKey Engineering Materials Vol. 813Microstructure and Corrosion Properties of PEO...

Microstructure and Corrosion Properties of PEO Coatings Produced on AM-Aluminum Alloys

Abstract:

Aluminum alloys are one of the main materials employed in aerospace and automotive applications. One of the problems that affect these alloys in certain application is the poor corrosion resistance that can, however, be enhanced with proper surface treatments, such as anodizing. Among these treatments, Plasma Electrolytic Oxidation (PEO) is one of the most promising and the production of PEO coatings on traditional aluminum alloy was extensively studied in literature. Recently, the production of a lot of components is going into the direction of using innovative manufacturing systems and customized components, with improved mechanical and physical properties, can be manufactured by additive manufacturing (AM) techniques. Among the AM methods, laser-based AM has an immense potential for producing fully dense metallic structures, using a variety of available metal powders and has attracted more and more attention. The resulting AM samples are characterized by different microstructures in comparison with the conventionally manufactured ones and this can cause differences also in the production of PEO coatings and other surface treatments. Objective of the present work is to produce PEO coatings on AM samples in order to increase the corrosion and wear performances of the samples. PEO coating were produced on the samples testing different parameters and the coatings were characterized, in terms of microstructure and composition, with SEM analysis. The corrosion resistance of the samples was also evaluated with electrochemical tests. The results were compared with the ones obtained on traditionally manufactured samples. PEO coatings were successfully produced on AM samples obtaining samples with good coatings thickness and improved corrosion performances compared to the untreated ones.

You might also be interested in these eBooks

Corrosion. Protection of Structural Metals and Alloys (2019-2020)

View Preview

View Preview

Info:

Periodical:

Key Engineering Materials (Volume 813)

Pages:

298-303

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.813.298

Citation:

Cite this paper

Online since:

July 2019

Authors:

Luca Pezzato, Manuele Dabalà, Katya Brunelli*

Keywords:

Additive Manufacturing, Aluminum Alloy, Corrosion, Plasma Electrolytic Oxidation

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

* - Corresponding Author

References

[1] M. Cabrini, S. Lorenzi, T. Pastore, S. Pellegrini, D. Manfredi, P. Fino, S. Biamino, C. Badini, Evaluation of corrosion resistance of Al–10Si–Mg alloy obtained by means of Direct Metal Laser Sintering, J. Mater. Proc. Techn. 231 (2016) 326–335.

DOI: 10.1016/j.jmatprotec.2015.12.033

Google Scholar

[2] P.G. Sheasby, R. Pinner, S. Verinck, The surface treatment and finishing of aluminium and its alloys, ASTM International, (2001).

Google Scholar

[3] L.O. Snizhko, A.L. Yerokhin, A. Pilkington, N.L. Gurevina, D.O. Misnyankin, A. Leyland, A. Matthews, Anodic processes in plasma electrolytic oxidation of aluminium in alkaline solutions, Electrochim Acta, 49 (2004) 2085-2095.

DOI: 10.1016/j.electacta.2003.11.027

Google Scholar

[4] J. Martin, A. Melhem, I. Shchedrina, T. Duchanoy, A. Nominè, G. Henrion, T. Czerwiec, T. Belmonte, Effects of electrical parameters on plasma electrolytic oxidation of aluminium, Surf. Coat. Technol., 221 (2013) 70-76.

DOI: 10.1016/j.surfcoat.2013.01.029

Google Scholar

[5] J. Curran, T. W. Clyne, Porosity in Plasma Electrolytic Oxide Coatings, Acta Materialia, 54 (2006) 1985–(1993).

DOI: 10.1016/j.actamat.2005.12.029

Google Scholar

[6] L. Pezzato, V. Angelini, K. Brunelli, C. Martini, M. Dabalà, Tribological and corrosion behavior of PEO coatings with graphite nanoparticles on AZ91 and AZ80 magnesium alloys, Trans. Nonferr. Met. Soc. 28 (2018) 259–272.

DOI: 10.1016/s1003-6326(18)64659-x

Google Scholar

[7] L. Pezzato, M. Rigon, A. Martucci, K. Brunelli, M. Dabalà, Plasma Electrolytic Oxidation (PEO) as pre-treatment for sol-gel coating on aluminum and magnesium alloys, Surface and Coatings Technology 366 (2019) 114-123.

DOI: 10.1016/j.surfcoat.2019.03.023

Google Scholar

[8] P. Cerchier, L. Pezzato, K. Brunelli, P. Dolcet, A. Bartolozzi, R. Bertani, M. Dabalà, Antibacterial effect of PEO coating with silver on AA7075, Materials Science and Engineering C 75 (2017) 554-564.

DOI: 10.1016/j.msec.2017.02.084

Google Scholar

[9] C. Blawert, P. Bala Srinivasan, Plasma electrolytic oxidation treatment of magnesium alloys, in: H. Dong (ed.) Surface Engineering of Light Alloys: Aluminium, Magnesium and Titanium Alloys, Oxford, Woodhead Publishing, 2010, pp.155-183.

DOI: 10.1533/9781845699451.2.155

Google Scholar