一种AlSi合金（AS12）在硫酸阳极氧化和MAO后的耐蚀性：癸酸钠密封的机理和效果

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

Surface & Coatings Technology Pub Date : 2025-09-30 DOI:10.1016/j.surfcoat.2025.132745

Anas Ben Romdhane , Delphine Veys-Renaux , Khaled Elleuch , Emmanuel Rocca

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引用次数: 0

摘要

铝硅合金广泛应用于工业或家用的模塑部件中，为了提高其表面性能，特别是耐腐蚀性，可以进行电化学精加工处理。本研究采用常规硫酸阳极氧化法和微弧氧化法分别在AS12合金表面生长阳极层。当铝和硅在微弧层内被完全氧化时，金属硅颗粒被嵌入在酸性介质中形成的经典多孔氧化铝层中，产生应变并导致涂层开裂。在NaCl 0.1 M条件下，电化学阻抗谱（EIS）和盐雾试验（SST）对材料的耐蚀性进行了对比评价，结果一致表明微弧氧化提高了材料的耐蚀性，而硫酸阳极氧化没有提高材料的耐蚀性，这是因为腐蚀机制主要是由硅颗粒与铝基体之间的电偶联驱动的。采用癸酸钠CH3(CH2)8CCONa对两种类型的阳极层进行密封后处理。在每一种情况下，都能注意到防腐性能的提高，尤其是硫阳极氧化。

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Corrosion resistance of an AlSi alloy (AS12) after sulfuric anodizing and MAO: Mechanisms and effect of sealing with sodium decanoate

AlSi alloys, widely used in moulded parts for industrial or domestic applications, may undergo an electrochemical finishing treatment in order to enhance their surface properties, especially their corrosion resistance. In the present study, anodic layers are grown on an AS12 alloy by conventional anodizing in sulfuric acid on the one hand and by microarc oxidation (MAO) on the other hand. While both aluminium and silicon are completely oxidized within the microarc layer, metallic silicon particles are embedded within the classic porous alumina layer formed in acidic medium, generating strains and resulting in a cracked coating. Regarding the corrosion resistance, evaluated comparatively by electrochemical impedance spectroscopy (EIS) measurements performed in NaCl 0.1 M and salt spray test (SST), the results consistently show an improvement by microarc oxidation but not by sulfuric anodizing, since the corrosion mechanisms are mainly driven by galvanic coupling between silicon particles and aluminium matrix. A sealing post-treatment in sodium decanoate CH₃(CH₂)₈CCONa is considered as well on both types of anodic layers. An enhancement of the anticorrosion performances is noticed in each case, more significantly for sulfuric anodizing.

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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.