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Article

Microstructural and Corrosion Properties of PEO Coated Zinc-Aluminized (ZA) Steel

1
Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
2
Department of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(5), 448; https://doi.org/10.3390/coatings10050448
Received: 26 March 2020 / Revised: 27 April 2020 / Accepted: 28 April 2020 / Published: 4 May 2020
(This article belongs to the Special Issue Surface Modification of Metals and Alloys)
Plasma Electrolytic Oxidation (PEO) is a surface treatment, similar to anodizing, that produces thick oxide films on the surface of metals. In the present work, PEO coatings were obtained on zinc-aluminized (ZA) carbon steel using a solution containing sodium silicate and potassium hydroxide as electrolyte, and working with high current densities and short treatment times in Direct Current (DC) mode. The thickness of the coating, as well as the surface morphology, were strongly influenced by the process parameters, with different dissolution grades of the ZA layer depending on the current density and treatment time. A compromise between thickness and porosity of the coating was found with low current density/long treatment time or high current density/short treatment time. The PEO layer was mainly composed of aluminum oxides and silicon compounds. The corrosion resistance increased remarkably in the samples with the PEO coating. These PEO coated samples are suitable for sealing treatments that further increase their corrosion properties or will be also an ideal substrate for commercial painting, assuring improved mechanical adhesion and protection even in the presence of damages. View Full-Text
Keywords: plasma electrolytic oxidation; PEO; coatings; steel; zinc-aluminized; corrosion plasma electrolytic oxidation; PEO; coatings; steel; zinc-aluminized; corrosion
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MDPI and ACS Style

Pezzato, L.; Settimi, A.G.; Cerchier, P.; Gennari, C.; Dabalà, M.; Brunelli, K. Microstructural and Corrosion Properties of PEO Coated Zinc-Aluminized (ZA) Steel. Coatings 2020, 10, 448. https://doi.org/10.3390/coatings10050448

AMA Style

Pezzato L, Settimi AG, Cerchier P, Gennari C, Dabalà M, Brunelli K. Microstructural and Corrosion Properties of PEO Coated Zinc-Aluminized (ZA) Steel. Coatings. 2020; 10(5):448. https://doi.org/10.3390/coatings10050448

Chicago/Turabian Style

Pezzato, Luca, Alessio G. Settimi, Pietrogiovanni Cerchier, Claudio Gennari, Manuele Dabalà, and Katya Brunelli. 2020. "Microstructural and Corrosion Properties of PEO Coated Zinc-Aluminized (ZA) Steel" Coatings 10, no. 5: 448. https://doi.org/10.3390/coatings10050448

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