Performance of Magnesium-based Coatings Reinforced with Ceramic Particles and Chlorogenic Acid

WANG Jingyan; ZHANG Deqiu

doi:10.16490/j.cnki.issn.1001-3660.2026.20.021

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Surface Technology ›› 2026, Vol. 55 ›› Issue (20) : 294-302. DOI: 10.16490/j.cnki.issn.1001-3660.2026.20.021

Functional Surfaces and Technology

Performance of Magnesium-based Coatings Reinforced with Ceramic Particles and Chlorogenic Acid

WANG Jingyan^*, ZHANG Deqiu

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Abstract

Magnesium metal material is recognized as a lightweight structural material, and is known as "green material" because of its unique properties. It is widely used in construction, aerospace, automobile manufacturing, ship manufacturing, electrical and electronic and biomedical industries. However, magnesium metal is chemically active and prone to corrosion in humid and acidic environments. It can remain stable only in dry environments, kerosene and sodium hydroxide solutions, which limits its wide application. The effective method to improve the surface functionality of the magnesium alloy is the surface treatment technology, which forms a protective film on the magnesium alloy surface. Composites can be combined by selecting materials with different complementary advantages, which can avoid the performance limitations of a single material and improve the performance of the material. Micro-arc oxidation technology has attracted wide attention in surface treatment of magnesium alloy due to its simple preparation process, green environmental protection characteristics, and high applicability to metals such as magnesium, aluminum and titanium. Although the rough porous structure of micro-arc oxidation is conducive to cell adhesion, the porous outer layer of the micro-arc oxidation coating is easy to accumulate corrosive medium and become an erosion channel. Therefore, in practical research, the micro-arc oxidation coating is mostly sealed. At present, there are few studies on the function of the magnesium-based micro-arc oxidation coating reinforced by ceramic particles and traditional Chinese medicine extracts on the magnesium alloy surface. Therefore, in this paper, an UMAO/SCA-CA-BCP coating is prepared by sealing the micro-arc oxidation coating through silane coupling. The UMAO/SCA-CA-BCP coating has corrosion resistance, biological activity, wear resistance and other functions. Firstly, the ultrasonic micro-arc oxidation (UMAO) layer was prepared on the surface of pure magnesium by ultrasonic micro-arc oxidation technology, and then the UMAO/SCA-CA-BCP coating was prepared by loading ceramic particles (BCP) and chlorogenic acid (CA) on the UMAO layer through silane coupling (SCA). The functional coating element composition and phase structure were characterized by scanning electron microscope and X-ray diffractometer, and the surface morphology of the coating was observed. The coating wettability was measured by contact angle measuring instrument. The effects of loading ceramic particles and chlorogenic acid on the wear resistance and adhesion of the coating were analyzed by pin-on-disk friction and wear tester and adhesion automatic scratch tester. The coating biological activity was evaluated by immersion test, and the coating corrosion resistance in a simulated environment was systematically analyzed by potentiodynamic polarization test. The UMAO/SCA-CA-BCP coating is composed of Ca₁₀(PO₄)₆(OH)₂, Ca₃(PO₄)₂, Mg₂SiO₄ and MgO phases. After immersion in simulated body fluid (SBF), the surface of the UMAO/SCA-CA-BCP coating has a high affinity for calcium and phosphorus ions in SBF, and it is easier to induce apatite deposition after loading ceramic particles and chlorogenic acid. The contact angle of the UMAO/SCA-CA-BCP coating is 78.14°. After the surface of pure magnesium is modified by composite modification, the contact angle of the coating surface increases, which is closer to the hydrophobic coating. The critical load of the UMAO/SCA-CA-BCP coating is 12.0 N. The coating is chemically bonded and the bonding force is enhanced. Potentiodynamic polarization experiments show that the corrosion current density of the UMAO/SCA-CA-BCP coating (2.427×10^-6 A/cm²) is much lower than that of the pure Mg substrate (1.756 9×10^-5 A/cm²), and the corrosion resistance of the UMAO/SCA-CA-BCP coating is improved. The corrosion resistance, adhesion and bioactivity of the Mg-based UMAO/SCA-CA-BCP composite coating are better than those of the Mg-based UMAO coating. The loading of ceramic particles and chlorogenic acid effectively improves the functionality of the composite coating.

Key words

magnesium / silane coupling agent / biphasic calcium phosphate / chlorogenic acid / ultrasonic micro-arc oxidation / functionality / corrosion resistance / biological activity

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WANG Jingyan, ZHANG Deqiu. Performance of Magnesium-based Coatings Reinforced with Ceramic Particles and Chlorogenic Acid[J]. Surface Technology. 2026, 55(20): 294-302

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