
摘要:针对镁合金在生理环境中极易被腐蚀这一问题,以Mg-Zn-Ca合金丝为基体,采用电化学阻抗谱(EIS)、极化曲线(TAFEL)以及体外长期降解的方法研究硅烷涂层对镁合金丝的保护作用。结果表明:复合硅烷涂层(BTSE/GPTMS)对镁合金丝的保护作用最好,其阻抗从未经硅烷处理的镁合金丝的59
(Ω·cm2)提高至1133 (Ω·cm2),腐蚀电流密度从1.88×10-4 A·cm-2下降至5.19×10-6
A·cm-2;在模拟体液(SBF)中浸泡7天后,其pH值比未经硅烷处理的镁合金丝有所降低;失重率比未经硅烷处理的镁合金丝降低了14.6%。
关键词:镁合金丝;单一硅烷涂层;复合硅烷涂层;耐腐蚀性
Abstract: In order
to solve the problem that magnesium alloy is easy to be corrode in
physiological environment, the protective effect of silane coating on magnesium
alloy wire was studied by electrochemical impedance spectroscopy (EIS),
polarization curve (TAFEL) and in vitro long-term degradation
methods. The results show that the composite silane coating (BTSE/GPTMS) has
the best protective effect on magnesium alloy wire. The impedance of BTSE/GPTMS
increases from 59 (Ω·cm2) to 1133 (Ω·cm2), and the
corrosion current density decreases from 1.88×10-4 A·cm-2
to 5.19×10-6 A·cm-2. After soaking in simulated body fluid (SBF) for
7 days, the pH value of the magnesium alloy wire was lower than that of the
magnesium alloy wire without silane treatment. The weight loss rate of
magnesium alloy wire without silane treatment was reduced by 14.6%.
Key words:
magnesium alloy wire; Single silane coating; Composite silane coating;
Corrosion resistance
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