Abstract

316L stainless steel (SS) is used as an orthopedic implant biomaterial due to its properties such as superior tensile strength, fatigue strength, and fracture toughness. Although it possesses such remarkable properties, it is corroded in aggressive biofluids. Hence, with a view to combat corrosion of surgical grade 316L SS, 3-amino-5-mercapto-1,2,4-triazole (AMTa) and its Na-montmorillonite (Na-MMT) K10 clay composite were electropolymerized over its surface and its anti-corrosion performance was evaluated. The results of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies (PDS) revealed the enhanced protective behavior of the composite compared to the polymer which was guaranteed by the results of chronoamperometric studies and atomic absorption spectroscopy. The functionalities of electrochemically synthesized p-AMTa and its Na-MMT composite films were characterized by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy results which supported the formation of the polymer by NH–NH and S–S linkages. The surface morphological studies of a bare and film-deposited 316L SS confirmed the protective layer formed over the SS surface. Further, the effect of concentration of monomer and Na-MMT on corrosion inhibition was also studied. Anticorrosive performance of the polymer and Na-MMT composite studied after 7 days of immersion in the Ringer solution revealed that composite-coated 316L SS could retain its protective performance.

Graphic abstract

中文翻译：

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在林格溶液中对外科级316L不锈钢具有强大的防腐性能和优异的防腐性能

摘要

316L不锈钢（SS）由于其优异的拉伸强度，疲劳强度和断裂韧性等特性而被用作骨科植入物生物材料。尽管它具有如此卓越的性能，但在腐蚀性生物流体中却受到腐蚀。因此，为了抵抗外科级316L SS的腐蚀，在其表面上电聚合了3-氨基-5-巯基1,2,4-三唑（AMTa）及其钠蒙脱土（Na-MMT）K10粘土复合材料并评估了其防腐性能。电化学阻抗谱法（EIS）和电位动力学极化研究（PDS）的结果表明，与聚合物相比，复合材料的保护性能得到了增强，计时电流分析法和原子吸收光谱法的结果保证了该复合材料的保护性能。电化学合成的功能通过傅里叶变换红外光谱（FTIR）和拉曼光谱结果对p -AMTa及其Na-MMT复合膜进行了表征，结果支持了通过NH-NH和S-S键形成聚合物。裸露并沉积有膜的316L SS的表面形态研究证实了在SS表面上形成的保护层。此外，还研究了单体和Na-MMT的浓度对缓蚀性能的影响。在林格溶液中浸泡7天后，对聚合物和Na-MMT复合材料的防腐性能进行了研究，结果表明，复合涂层316L SS可以保留其防护性能。

图形摘要