Effect of Plasma Treatment on Performance of Polybutylene Adipate Coating on Biomedical AZ31 Mg-alloy

doi:10.11901/1005.3093.2022.271

Chinese Journal of Materials Research

2023, Vol. 37

Issue (4): 271-280 DOI: 10.11901/1005.3093.2022.271

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Effect of Plasma Treatment on Performance of Polybutylene Adipate Coating on Biomedical AZ31 Mg-alloy

LI Pengyu¹^,², LIU Zitong²^,³, KANG Shumei¹(

), CHEN Shanshan²(

)

^1.School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China

Cite this article:

LI Pengyu, LIU Zitong, KANG Shumei, CHEN Shanshan. Effect of Plasma Treatment on Performance of Polybutylene Adipate Coating on Biomedical AZ31 Mg-alloy. Chinese Journal of Materials Research, 2023, 37(4): 271-280.

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Abstract

Polybutylene adipate (PBA) protective coating was prepared on fluorinated AZ31 Mg-alloy by uniform speed lifting method and then the coated Mg-alloys were subjected to plasma treatment with different power and time. The effect of plasma treatment on the surface morphology, phase composition and surface wettability of PBA protective coating were characterized by means of scanning electron microscope (SEM), X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscope (FT-IR) and contact angle measuring instrument. The corrosion resistance of the coated Mg-alloy was characterized by potentiodynamic polarization curve measurement and electrochemical impedance spectroscope (EIS). The biological activity of the protective coatings was verified by comparing the cells adhesion on the coating surface before and after plasma treatment. Results show that plasma treatment could increase the surface roughness of PBA protective coating, increase the oxygen atom proportion, and thereby enhance the wettability of the coating surface obviously. However, plasma treatment reduced the corrosion resistance of the PBA coated Mg-alloy to a certain extent, but its corrosion current density was 2~3 orders of magnitude lower than that of the AZ31 Mg-alloy without protective coating and the fluorinated ones. In sum, the PBA protective coating can provide effective protection for Mg-alloy substrate, and the EIS curve also showed the same results. Besides, Cell adhesion on the surface of plasma treated samples increased significantly.

Key words: metallic materials magnesium alloy protective coating plasma treatment wettability corrosion resistance

Received: 11 May 2022

ZTFLH:

TG146

Fund: National Natural Science Foundation of China(51901227);National Natural Science Foundation of China(81873918);Youth Innovation Promotion Association, Chinese Academy of Sciences(2019194)

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.271 OR https://www.cjmr.org/EN/Y2023/V37/I4/271

Table 1 Chemical composition of AZ31 magnesium alloy (mass fractiom,%)

Table 2 PBS solution formulation (g/L)

Fig.1 Microscopic morphology of PBA protective coating before and after plasma treatment (a) without plasma treatment; (b) plasma treatment power of 20 W for 60 s; (c) plasma treatment power 60 W for 60 s

Fig.2 XPS patterns of protective coatings before and after plasma treatment

Table 3 Proportion of C and O elements in protective coatings before and after plasma treatment

Fig.3 FT-IR patterns of protective coatings after different plasma treatments

Fig. 4 Partitioning of C and O elements of unplasma-treated PBA coating and 60 W/300 s plasma-treated PBA coating (a, b) peak separation of C and O elements of PBA coating without plasma treatment and (c, d) peak separation of C and O elements of PBA coating with 60 W/300 s plasma treatment

Table 4 Integral area and proportion of each oxygen-containing functional group after peak splitting

Fig.5 Contact angle and water droplet pattern of PBA coating with and without plasma treatment for different time

Fig.6 Contact angle and water droplet pattern of PBA coating with and without plasma-treatment at different power for same time

Fig.7 Tafel curves of Mg alloy with PBA protective coatings after different plasma treatments

Table 5 Fitting results of dynamic potential polarization curves of Mg alloy with PBA protective coatings after different plasma treatments

Fig.8 Macroscopic morphologies of Mg alloy with PBA protective coating after electrochemical measurement (a) before plasma treatment; (b) after plasma treatment

Fig. 9 Nyquist curves of Mg alloy with PBA protective coatings after different plasma treatments

Fig.10 Equivalent circuit model (a) equivalent circuit diagram of magnesium alloy substrate and fluorinated magnesium alloy; (b) equivalent circuit diagram of magnesium alloy with floride coating & PBA protective coating

Table 6 Equivalent circuit diagram fitting results of samples with PBA protective coatings after different plasma treatments

Fig.11 Adhesion of human umbilical vein endothelial cells on the surface of Mg alloy with PBA protective coating before and after plasma treatment (a) samples without plasma treatment; (b) samples with plasma treatment at the power of 60 W for 60 s

Fig.12 Schematic diagram of the reaction of plasma technology with O₂ for PBA protective coating

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