Almathami Sharifah, Venezuela Jeffrey, Yang Nan, Wang Yuan, Mardina Zahrina, Dargusch Matthew
Centre for Advanced Materials Processing and Manufacturing (AMPAM), Advanced Engineering Building, The University of Queensland, Brisbane, Queensland, 4072 Australia.
ACS Biomater Sci Eng. 2023 May 8;9(5):2301-2316. doi: 10.1021/acsbiomaterials.2c00901. Epub 2023 Apr 18.
This work presents a study on the influence of biologically relevant ions on the corrosion of zinc (Zn) in physiological fluids. Electrochemical techniques were used to investigate the degradation of pure Zn exposed to different physiological electrolytes containing chlorides, carbonates, sulfates, and phosphates. The corrosion behavior of Zn in the solutions over a 7-day period was also assessed. SEM, EDS, and FTIR were used to analyze corrosion products. With respect to corrosion, the most aggressive ions are chlorides, which induce localized corrosion, while carbonates and phosphates reduce the corrosive attack of the chloride on Zn while inducing uniform corrosion. Sulfates reduce the corrosion rate by disrupting Zn's passive layer. The overall corrosion rate of Zn changed in each electrolyte depending on the nature of the solution and the corrosion product formed. These findings will be useful in predicting the in-service behavior of future biodegradable Zn medical implants.
这项工作展示了一项关于生物相关离子对锌（Zn）在生理流体中腐蚀影响的研究。采用电化学技术研究了纯锌在含有氯化物、碳酸盐、硫酸盐和磷酸盐的不同生理电解质中的降解情况。还评估了锌在这些溶液中7天内的腐蚀行为。使用扫描电子显微镜（SEM）、能谱仪（EDS）和傅里叶变换红外光谱仪（FTIR）分析腐蚀产物。就腐蚀而言，最具侵蚀性的离子是氯化物，它会引发局部腐蚀，而碳酸盐和磷酸盐在引发均匀腐蚀的同时，会降低氯化物对锌的腐蚀作用。硫酸盐通过破坏锌的钝化层来降低腐蚀速率。锌在每种电解质中的总体腐蚀速率会根据溶液的性质和形成的腐蚀产物而变化。这些发现将有助于预测未来可生物降解锌医疗植入物的使用性能。
