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首页> 外文期刊>Journal of Materials Engineering and Performance >Anticorrosive Behavior Enhancement of Stainless Steel 304 through Tantalum-Based Coatings: Role of Coating Morphology
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Anticorrosive Behavior Enhancement of Stainless Steel 304 through Tantalum-Based Coatings: Role of Coating Morphology

机译：防腐行为通过钽基涂层增强不锈钢304：涂料形态的作用

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摘要

Stainless steel (SS 304) has good mechanical strength and corrosion resistance properties, but it is not resistive to halides corrosion which limits the use of SS 304 in seawater applications. In this regard, the present work has been focused on the investigation of anticorrosive nature of Ta2O5 (tantalum pentoxide), Ta3N5 (tantalum nitride) and TaON (tantalum oxynitride) films deposited on AISI 304 stainless steel by RF reactive magnetron sputtering technique for anticorrosive applications. The predominant influencing factors especially film composition and surface morphology of the coatings were characterized by XRD, FE-SEM and AFM. The anticorrosive properties of the coatings were investigated through potentiodynamic polarization (Tafel) test and electrochemical impedance spectroscopy in 1M NaCl solution at room temperature. The morphological results showed that the films are uniform with low surface roughness, i.e., less than 10 nm. The contact angle and corrosion study of the films revealed that the tantalum oxynitride film, with nanoscale roughness, has greatly enhanced the corrosion protection of the stainless steel in 1M NaCl solution. The tantalum oxynitride film showed hydrophobic nature and the corrosion current density in the order of 10(-11) A/cm(2), which led to better anticorrosive behavior. The highest polarization resistance (R-p) was observed for tantalum oxynitride film, i.e., 3.14 M omega. Overall, tantalum-based coatings have reduced the corrosion rate and enhanced the inhibition efficiency (more than 50%) in comparison with the bare SS 304 substrate.
机译：不锈钢（SS 304）具有良好的机械强度和耐腐蚀性能，但不耐卤化物腐蚀，这限制了SS 304在海水中的应用。在这方面，目前的工作重点是通过射频反应磁控溅射技术在AISI 304不锈钢上沉积的Ta2O5（五氧化二钽）、Ta3N5（氮化钽）和TaON（氮氧化钽）薄膜的防腐性质。通过XRD、FE-SEM和AFM对涂层的主要影响因素，尤其是薄膜组成和表面形貌进行了表征。通过动电位极化（Tafel）试验和电化学阻抗谱研究了涂层在1M NaCl溶液中的抗腐蚀性能。形态学结果表明，薄膜均匀，表面粗糙度低，小于10nm。薄膜的接触角和腐蚀研究表明，具有纳米级粗糙度的氮氧化钽薄膜大大增强了不锈钢在1M NaCl溶液中的腐蚀防护。氮氧化钽薄膜具有疏水性，腐蚀电流密度约为10（-11）A/cm（2），因此具有更好的防腐性能。氮氧化钽薄膜的极化电阻（R-p）最高，即3.14MΩ。总的来说，与裸SS 304基底相比，钽基涂层降低了腐蚀速率，提高了缓蚀效率（超过50%）。

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