Insight into the role of Ce incorporation into energy-efficient flash-PEO films for the corrosion protection of additive-manufactured Al10SiMg

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-03-18 DOI:10.1016/j.surfcoat.2025.132057

Muhammad Ahsan Iqbal , Humaira Asghar , Endzhe Matykina , Raul Arrabal , Marta Mohedano

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Abstract

This study reports the development of a thin and energy-efficient plasma electrolytic oxidation (PEO) protective coating on additively manufactured Al10SiMg using an electrolyte composed of Na₃(P₃O₆)₃, KOH, Na₂EDTA and Ce₂(SO₄)₃. The oxidation period was varied from 100 s to 300 s to understand the correlation between energy consumption and cerium incorporation, as well as its impact on the structural and corrosion resistance of the PEO film. To obtain a mechanistic understanding of the role of cerium, the structural properties before and after immersion in 3.5 wt% NaCl solution were analyzed to determine how cerium functions as an active corrosion inhibitor when incorporated into the PEO layer. The findings revealed successful and uniform cerium incorporation throughout the PEO coating (up to a 200 s oxidation time). The inhibitory effect of Ce was evidenced by the increase in the impedance modulus (Z_{0.01 Hz}), which was up to twice as effective as that of PEO without cerium. The Ce-doped PEO protective film, with its intrinsic surface porosity, provides substantial dry and wet adhesion to organic coating systems, making it an eco-friendly priming layer for practical applications requiring post-treatment.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.