Enhancing corrosion resistance of Ti-coated SUS316L bipolar plates: The role of residual stress and microstructural evolution

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-07-16 DOI:10.1016/j.corsci.2025.113194

Haechan Jo , Hyorin Moon , Jeongsoo Kim , Dongwoo Lee

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引用次数: 0

Abstract

Enhancing the corrosion resistance of bipolar plates (BPPs) is crucial for improving the durability and efficiency of proton exchange membrane water electrolyzers (PEMWEs). This study investigates the impact of processing conditions on the microstructure, mechanical properties, and corrosion behavior of magnetron sputter deposited titanium (Ti) thin films on SiN_x/Si and SUS316L substrates. Deposition temperature significantly affected the grain structure and phase transitions, with higher temperatures promoting the formation of a dense HCP phase with improved crystallinity. For Ti films deposited on SUS316L, the thermal expansion mismatch between the film and the substrate induces compressive residual stress in the Ti film, resulting in densification, reduced defect density, and enhanced resistance to plastic deformation and ion infiltration. Ti coatings deposited at elevated temperatures exhibited up to a 60 % increase in pitting potential compared to room-temperature deposited films, highlighting the role of stress-induced densification in mitigating crack formation. By establishing correlations between microstructure, mechanical properties, and corrosion resistance, this study provides insights into optimizing deposition processes and stress management strategies for durable coatings in PEMWEs.

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增强ti包覆SUS316L双极板的耐蚀性：残余应力和显微组织演变的作用

提高双极板（BPPs）的耐腐蚀性是提高质子交换膜水电解槽（PEMWEs）耐久性和效率的关键。本研究研究了不同工艺条件对磁控溅射沉积钛（Ti）薄膜在SiNx/Si和SUS316L衬底上的微观结构、力学性能和腐蚀行为的影响。沉积温度对晶粒结构和相变有显著影响，温度升高有利于形成致密的HCP相，结晶度提高。对于沉积在SUS316L上的Ti薄膜，由于薄膜与衬底之间的热膨胀失配，在Ti薄膜中产生压缩残余应力，导致致密化，降低缺陷密度，增强抗塑性变形和离子渗透能力。与室温沉积膜相比，高温沉积的Ti涂层的点蚀电位增加了60% %，突出了应力诱导致密化在减轻裂纹形成中的作用。通过建立微观结构、力学性能和耐腐蚀性之间的相关性，本研究为优化PEMWEs耐用涂层的沉积工艺和应力管理策略提供了见解。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.