Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 26 March 2020 / Approved: 29 March 2020 / Online: 29 March 2020 (01:35:10 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Coatings 2020, 10, 448
DOI: 10.3390/coatings10050448

Abstract

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 as electrolyte a solution containing sodium silicate and potassium hydroxide, and working with high current densities and short treatment times in DC mode. The surface morphology resulted the typical one of PEO layers, with the presence of a lot of pores and micro-cracks. Considering the cross section, the thickness of the coating was strongly influenced by the process parameters, with different dissolution grades of the ZA layer depending on the current density and treatment time. The PEO layer resulted mainly composed by aluminum and zinc oxides and silicates. The corrosion resistance was remarkable increased in the samples with the PEO coating.

Subject Areas

plasma electrolytic oxidation; PEO; coatings; steel; corrosion; zinc-aluminized

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