Corrosion behavior analysis and plasma electrolytic oxidation coatings protection study of selective laser melting–AlSi10Mg alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-10-02 DOI:10.1016/j.surfcoat.2025.132753

Zhanpeng Li , Ronghui Kou , Guofeng Ma , Jiahao Wang , Shu Chen , Guangchao Liu , Yu Zhang

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引用次数: 0

Abstract

Selective Laser Melting (SLM)–AlSi10Mg alloy is widely used in areas requiring light weight and high strength due to its good mechanical properties. However, the corrosion resistance of the alloy is poor in the application environment. In this paper, the corrosion behavior of SLM–AlSi10Mg was investigated by micro–morphology and Density Functional Theory (DFT) calculations, and the PEO treatment significantly enhanced the corrosion resistance of the alloy. Further results showed that: In 3.5 wt% NaCl environment, the I_corr of PEO coatings were reduced by two orders of magnitude and the corrosion resistance was significantly improved by kinetic potential polarization curves and EIS tests. And it was found that the degree of grain refinement and pores in the AlSi10Mg melt pools affected both the corrosion resistance and the in–situ growth of the PEO coatings. The DFT calculations show that the semiconducting properties of Si and Mg₂Si phases enhance the corrosion resistance of the alloy. The Si and Mg₂Si phases also slow down the electron transfer and inhibit the corrosion behavior as analyzed from the energy band structure and density of states calculations. In addition, the Si phase was found to be present in the alloy in a doped form. The aim of this paper is PEO coatings to improve the electrochemical corrosion performance of SLM–AlSi10Mg alloy. And the corrosion behavior of the alloy and the influencing factors are verified by DFT analysis.

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选择性激光熔化alsi10mg合金的腐蚀行为分析及等离子体电解氧化涂层保护研究

选择性激光熔化(SLM) -AlSi10Mg合金由于其良好的力学性能，被广泛应用于要求轻量化和高强度的领域。但该合金在应用环境中的耐腐蚀性较差。本文通过微观形貌和密度泛函理论（DFT）计算研究了SLM-AlSi10Mg合金的腐蚀行为，PEO处理显著提高了合金的耐蚀性。进一步的结果表明：在3.5 wt% NaCl环境下，PEO涂层的Icorr降低了2个数量级，其耐蚀性显著提高。结果表明，AlSi10Mg熔池中晶粒细化程度和气孔对PEO涂层的耐蚀性和原位生长均有影响。DFT计算表明，Si相和Mg2Si相的半导体特性增强了合金的耐蚀性。从能带结构和态密度计算可以看出，Si和Mg2Si相也减缓了电子转移，抑制了腐蚀行为。此外，发现硅相以掺杂形式存在于合金中。本文的目的是为了提高SLM-AlSi10Mg合金的电化学腐蚀性能。并通过DFT分析验证了合金的腐蚀行为及其影响因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.