Hybrid inorganic sol-gel silane/organic polycaprolactone coatings for enhanced corrosion protection on AZ31B magnesium alloy

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-05-28 DOI:10.1007/s10971-025-06804-7

Lutviasari Nuraini, Joko Triwardono, Rahma Nisa Hakim, Rahadian Roberto, Fadli Rohman, Yudi Nugraha Thaha, Albertus Deny Heri Setyawan, Aprilia Erryani

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Abstract

The silane inorganic coating and its hybrid with organic polycaprolactone (PCL) have been developed to improve the corrosion resistance of a magnesium alloy (AZ31B). This study investigates the effects of the aging time of the sol materials for the inorganic coating and its combination with PCL on the corrosion properties of AZ31B. The corrosion behavior was examined using potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5 wt% NaCl at room temperature. The organic monolayer was prepared by a sol-gel route using tetraethyl orthosilicate (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) precursors. The prolonged aging time of the TEOS/MPTMS sol, from 1 to 7 days, increases the hydrophobicity, roughness, and corrosion resistance of the coating. The combination of TEOS/MPTMS with PCL decreases the hydrophobicity of the coating layer. Moreover, the hybrid double-layer coating of TEOS/MPTMS with PCL on the AZ31B alloy significantly enhances the corrosion resistance by 10 times compared to that of the monolayer TEOS/MPTMS coating.

Graphical Abstract

Schematic of the inorganic sol–gel TEOS/MPTMS coating route (a) and organic polycaprolactone (PCL) coating route (b)

Abstract Image

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无机溶胶-凝胶硅烷/有机聚己内酯复合涂层增强AZ31B镁合金的防腐性能

为了提高镁合金（AZ31B）的耐腐蚀性能，研制了硅烷无机涂层及其与有机聚己内酯（PCL）的杂化。研究了无机涂层溶胶材料的老化时间及其与PCL的结合对AZ31B腐蚀性能的影响。采用动电位极化和电化学阻抗谱法研究了合金在3.5 wt% NaCl溶液中的室温腐蚀行为。以正硅酸四乙酯（TEOS）和3-巯基丙基三甲氧基硅烷（MPTMS）为前驱体，采用溶胶-凝胶法制备了有机单分子膜。TEOS/MPTMS溶胶的老化时间从1天延长到7天，提高了涂层的疏水性、粗糙度和耐腐蚀性。TEOS/MPTMS与PCL的结合降低了涂层的疏水性。此外，在AZ31B合金表面制备TEOS/MPTMS与PCL复合双层涂层，其耐蚀性比单层TEOS/MPTMS涂层提高了10倍。无机溶胶-凝胶TEOS/MPTMS涂层路线(a)和有机聚己内酯（PCL）涂层路线(b)示意图

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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.