Chemical and electrochemical surface treatments to grow magnesium hydroxystannate/manganese stearate coating for tuning biodegradation rate of AZ31 for bioresorbable implants

IF 5.6 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2025-06-10 Epub Date: 2025-03-31 DOI:10.1016/j.electacta.2025.146159

V. Verro , F. Di Franco , F. Carfì Pavia , F. La Monica , M. Santamaria

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Abstract

A double layered coating was deposited on AZ31 to tune biodegradation rate of this alloy in physiological solution at 37°C. A first chemical conversion process in a stannate ions containing alkaline solution was carried out on AZ31 to induce the growth of a MgSn(OH)₆ layer constituted by closely packed spheres. A manganese stearate (

Mn {[C H_{3} {(C H_{2})}_{16} COO]}_{2}

) layer was electrodeposited on the magnesium hydroxystannate to make the surface of the alloy hydrophobic. The resulting coating allowed to increase the corrosion resistance in Dulbecco's Modified Eagle Medium (DMEM) at 37°C, as assessed by recording polarization curves and electrochemical impedance spectra. Hydrogen evolution rate in DMEM, directly measured using gas chromatography to avoid misleading information due to negative difference effect, was reduced by the coating since the early stage of immersion. According to cytotoxicity tests with MC3T3 pre-osteoblastic cells, the coating resulted biocompatible.

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化学和电化学表面处理培养羟基锡酸镁/硬脂酸锰涂层以调节AZ31生物可吸收植入物的生物降解率

在AZ31表面沉积双层涂层，以调节AZ31在37℃生理溶液中的生物降解速率。在含锡酸盐离子的碱性溶液中，在AZ31上进行了第一次化学转化过程，诱导生长出由紧密排列的球体组成的MgSn(OH)6层。在羟基锡酸镁表面电沉积硬脂酸锰(Mn[CH3（CH2)16COO]2Mn[CH3(CH2)16COO]2）层，使合金表面具有疏水性。根据记录的极化曲线和电化学阻抗谱，所得到的涂层可以提高Dulbecco的Modified Eagle Medium （DMEM）在37°C下的耐腐蚀性。采用气相色谱法直接测量DMEM中的析氢速率，以避免由于负差效应而产生的误导信息，从浸泡初期开始，涂层就降低了DMEM中的析氢速率。对MC3T3成骨前细胞进行细胞毒性试验，结果表明该涂层具有生物相容性。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.