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揭示钛微合金化对激光金属沉积制备的GH3536合金在质子交换膜燃料电池模拟环境中的微观结构和耐腐蚀性的影响。

Unveiling the Effect of Ti Micro-Alloying on the Microstructure and Corrosion Resistance of the GH3536 Alloy Processed by Laser Metal Deposition in a Simulated Environment for PEMFCs.

作者信息

Xu Bing, Li Bo, Zhang Jie, Tong Jianping, Liu Yi

机构信息

Key Laboratory of Quantum Precision Measurement of Zhejiang Province, School of Physics, Zhejiang University of Technology, Hangzhou 310023, China.

College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.

出版信息

Materials (Basel). 2024 Dec 2;17(23):5900. doi: 10.3390/ma17235900.

DOI:10.3390/ma17235900
PMID:39685336
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11643431/
Abstract

This article addresses the knowledge gap regarding the effect of Ti addition on the microstructure and corrosion behavior of the LMD-processed GH3536 alloy in a simulated solution of proton exchange membrane fuel cells (PEMFCs). The microstructural evolution, corrosion resistance, and passive film characteristics of LMD-processed GH3536 alloy with varying Ti contents were characterized through a variety of techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), X-ray photoelectron spectroscopy (XPS), and a series of electrochemical measurements. The results indicate that the corrosion resistance of the LMD-processed GH3536 alloy significantly improves with increasing Ti content. However, when the Ti content exceeds 0.2 wt.%, the beneficial effect on corrosion resistance is weakened. Two primary mechanisms explain the enhanced corrosion resistance, involving the heterogeneous nucleation of Ti-modified AlO and Ti solute segregation, which promotes grain refinement. In addition, grain refinement can provide more active sites for the formation of compact passive films, thereby improving corrosion resistance of the GH3536 alloy.

摘要

本文探讨了在质子交换膜燃料电池（PEMFC）模拟溶液中，添加钛对激光粉末沉积（LMD）制备的GH3536合金微观结构和腐蚀行为影响方面的知识空白。通过多种技术对不同钛含量的LMD制备的GH3536合金的微观结构演变、耐腐蚀性和钝化膜特性进行了表征，包括扫描电子显微镜（SEM）、X射线衍射（XRD）、透射电子显微镜（TEM）、能谱分析（EDS）、电子背散射衍射（EBSD）、X射线光电子能谱（XPS）以及一系列电化学测量。结果表明，LMD制备的GH3536合金的耐腐蚀性随钛含量的增加而显著提高。然而，当钛含量超过0.2 wt.%时，对耐腐蚀性的有益影响会减弱。有两种主要机制解释了耐腐蚀性的增强，包括钛改性AlO的异质形核和钛溶质偏析，这促进了晶粒细化。此外，晶粒细化可为形成致密钝化膜提供更多活性位点，从而提高GH3536合金的耐腐蚀性。

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