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温度对增材制造技术（激光粉末床熔融）处理的 UNS-S31603 不锈钢钝化膜特性的影响

Effect of Temperature on Passive Film Characteristics of LPBF (Laser Powder-Bed Fusion) Processing on UNS-S31603.

作者信息

Goldsberry Reece, Narayanan Deeparekha, Case Raymundo, Mansoor Bilal, Castaneda Homero

机构信息

National Corrosion and Materials Reliability Laboratory, Department of Materials Science and Engineering, Texas A&M University, 1041 Rellis Pkwy, Bryan, TX 77807, USA.

出版信息

Materials (Basel). 2024 Jul 11;17(14):3420. doi: 10.3390/ma17143420.

DOI:10.3390/ma17143420
PMID:39063712
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11278099/
Abstract

The effect of temperature on the localized corrosion resistance and passive film characteristics of laser powder-bed fusion (LPBF) 316L (UNS S31603) was studied in a buffered 3.5 wt% NaCl solution at 25, 50, and 75 °C. DC techniques such as cyclic potentiodynamic polarization showed lower passive current densities, high breakdown potentials, and a higher resistance to initial breakdown compared with wrought 316L samples at all temperatures. However, LPBF 316L was more susceptible to metastable pitting at potentials before film breakdown and higher damage accumulation post film breakdown. AC techniques, such as Mott-Schottky analysis and electrochemical impedance spectroscopy, showed that the formed passive film was more robust on the LPBF 316L samples at all temperatures, accounting for the higher initial resistance to pitting. However, with increasing temperatures, the film formed had an increasing concentration of defect density. Passive compositions at the various test temperatures studied using X-ray photoelectron spectroscopy (XPS) showed that the LPBF samples showed higher amounts of Cr and Fe oxides and hydroxides compared with the wrought samples, which made the passive films on the LPBF samples more compact and protective. Investigation of the pits formed on the LPBF showed the preferential regions of attack were the melt-pool boundaries and cell interiors due to their being depleted of Cr and Mo when compared with the boundaries and matrix.

摘要

在25、50和75°C的缓冲3.5 wt% NaCl溶液中，研究了温度对激光粉末床熔融（LPBF）316L（UNS S31603）局部耐蚀性和钝化膜特性的影响。与锻造316L样品相比，在所有温度下，循环动电位极化等直流技术显示出更低的钝化电流密度、更高的击穿电位和更高的抗初始击穿能力。然而，LPBF 316L在膜击穿前的电位下更容易发生亚稳态点蚀，并且在膜击穿后损伤积累更高。莫特-肖特基分析和电化学阻抗谱等交流技术表明，在所有温度下，LPBF 316L样品上形成的钝化膜更坚固，这解释了其更高的初始耐点蚀能力。然而，随着温度升高，形成的膜缺陷密度浓度增加。使用X射线光电子能谱（XPS）研究的各种测试温度下的钝化成分表明，与锻造样品相比，LPBF样品显示出更高含量的Cr和Fe氧化物及氢氧化物，这使得LPBF样品上的钝化膜更致密且具有保护性。对LPBF上形成的点蚀进行研究表明，由于与边界和基体相比，熔池边界和晶胞内部的Cr和Mo含量较低，因此这些区域是优先腐蚀区域。

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本文引用的文献

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Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel.316L不锈钢不同增材制造方法的比较
Materials (Basel). 2021 Oct 29;14(21):6504. doi: 10.3390/ma14216504.
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In vitro corrosion study by EIS of a nickel-free stainless steel for orthopaedic applications.
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