Partially phosphorylated poly(vinyl alcohol) – A promising candidate in corrosion protection of magnesium for the biomedical industry?

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Journal of Plastic Film & Sheeting Pub Date : 2024-05-29 DOI:10.1177/87560879241247075

Carlos Henrique Michelin Beraldo, Augusto Versteg, Nico Scharnagl, Thiago Ferreira da Conceição

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Abstract

Partially phosphorylated poly(vinyl alcohol) (PPVA) as anticorrosive coating for AZ31 magnesium alloy was investigated in Hank’s Balanced Salt Solution (HBSS). Four phosphoric acid levels were used to modify PVA, resulting in four PPVA products. They were characterized using thermogravimetric analysis (TGA), water contact angle (WCA), and swelling test. PPVA-coated Mg alloys were evaluated using hydrogen evolution, cathodic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). TGA indirectly revealed crosslinked regions in the PPVA structure that increased with acid content. WCA and hydrogen evolution tests suggested that PPVA is a promising polymer for biomedical applications. Corrosion tests showed that the PPVA with 10% acid addition significantly improved the impedance modulus and lowered the cathodic kinetics compared to uncoated samples. The findings of the study suggested that the acid addition in PVA must be at least 10 % to guarantee improved corrosion resistance in HBSS, which indicates this material has potential for biological applications.

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部分磷酸化聚乙烯醇--生物医学工业镁腐蚀防护的理想候选材料？

在汉克平衡盐溶液（HBSS）中研究了部分磷酸化聚乙烯醇（PPVA）作为 AZ31 镁合金防腐涂层的性能。采用四种磷酸水平对 PVA 进行改性，得到了四种 PPVA 产物。使用热重分析 (TGA)、水接触角 (WCA) 和膨胀试验对它们进行了表征。使用氢演化、阴极极化、电化学阻抗光谱（EIS）和扫描电子显微镜（SEM）对 PPVA 涂层镁合金进行了评估。TGA 间接显示了 PPVA 结构中的交联区域，该区域随着酸含量的增加而增加。WCA 和氢进化测试表明，PPVA 是一种具有生物医学应用前景的聚合物。腐蚀测试表明，与未涂覆的样品相比，添加了 10%酸的 PPVA 能显著提高阻抗模量并降低阴极动力学。研究结果表明，PVA 中的酸添加量必须至少达到 10%，才能保证在 HBSS 中提高耐腐蚀性，这表明这种材料具有生物应用潜力。

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来源期刊

Journal of Plastic Film & Sheeting 工程技术-材料科学：膜

CiteScore

6.00

自引率

16.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Plastic Film and Sheeting improves communication concerning plastic film and sheeting with major emphasis on the propogation of knowledge which will serve to advance the science and technology of these products and thus better serve industry and the ultimate consumer. The journal reports on the wide variety of advances that are rapidly taking place in the technology of plastic film and sheeting. This journal is a member of the Committee on Publication Ethics (COPE).