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

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub 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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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.