Fabrication and characterization of Sr-modified Bredigite/chitosan nanocomposite coatings on AZ31 alloy via electrophoretic deposition for bone applications

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2025-02-15 DOI:10.1007/s10971-025-06695-8

P. Mofazali, H. Farnoush

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Abstract

Biosilicate materials have garnered significant interest for their potential to enhance corrosion resistance, particularly in biomedical applications. In this study, the surface of AZ31 magnesium alloy was modified with Sr-doped bredigite/chitosan nanocomposite coatings to improve corrosion resistance for use in biodegradable implants. Bredigite calcium silicate (Ca_7-xSr_xMgSi₄O₁₆), synthesized via a combustion sol–gel method with varying strontium doping levels (x = 0, 0.05, 0.1, 0.2, 0.4), was combined with chitosan and applied to magnesium substrates through electrophoretic deposition. Various techniques were employed to analyze and compare the chemical composition, verifying the incorporation of strontium into the bredigite structure. Electrochemical analysis demonstrated that the Sr-doped Bredigite/chitosan coatings significantly enhanced the corrosion resistance of the magnesium alloy in simulated body fluid. Polarization tests revealed that coatings containing 0.2 strontium substantially reduce the corrosion current density from 17.12 μA/cm² to ~1.37 μA/cm². These coatings, exhibiting remarkable bioactivity and corrosion protection, hold strong potential as candidates for biodegradable magnesium-based implants in biomedical applications.

Graphical Abstract

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通过电泳沉积在 AZ31 合金上制备钙改性 Bredigite/壳聚糖纳米复合涂层并确定其特性，以用于骨骼应用

生物硅酸盐材料因其增强耐腐蚀性的潜力而备受关注，尤其是在生物医学应用中。在这项研究中，用掺锶的红柱石/壳聚糖纳米复合涂层对 AZ31 镁合金表面进行了改性，以提高其在可生物降解植入物中的耐腐蚀性。通过燃烧溶胶-凝胶法合成的不同锶掺杂水平（x = 0、0.05、0.1、0.2、0.4）的红柱石硅酸钙（Ca7-xSrxMgSi4O16）与壳聚糖相结合，并通过电泳沉积涂覆到镁基底上。采用各种技术分析和比较了化学成分，验证了锶在红柱石结构中的结合情况。电化学分析表明，掺锶的红柱石/壳聚糖涂层能显著增强镁合金在模拟体液中的耐腐蚀性。极化测试表明，含 0.2 锶的涂层大大降低了腐蚀电流密度，从 17.12 μA/cm² 降至 ~1.37 μA/cm2。这些涂层具有显著的生物活性和腐蚀保护能力，很有可能成为生物医学应用中可生物降解的镁基植入物的候选材料。图文摘要

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.