Tribological Investigation of Chemically Modified Polytetrafluoroethylene Coating for Hydrogen Valve Application

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-06-29 DOI:10.1007/s11249-024-01869-x

Danavath Balu, Piyush Chandra Verma, Suresh Kumar Reddy Narala, R. Sujith, Prabakaran Saravanan

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Abstract

Hydrogen embrittlement (HE) can cause catastrophic failure of stainless steel valve and related components in hydrogen refueling stations (HRSs), reducing reliability, safety and increasing the cost. Here, in this study, the ability of chemically modified polytetrafluoroethylene (CM-PTFE) coatings on steel substrates in reducing the HE susceptibility and, the friction and wear of valve parts, are explored due to its low hydrogen (H₂) permeability and excellent solid lubrication. The solid lubrication properties of CM-PTFE-coated steel samples were investigated before and after H₂ charging at a pressure of 7 × 10⁵ Pascals. After H₂ charging, the samples were subjected to CHNS and X-ray diffraction (XRD) analysis to quantify the percentage of H₂ absorption and its effect on crystallinity of the samples, respectively, and interesting insights were obtained from both CHNS and XRD analysis. Furthermore, the effect of H₂ charging on uncoated steel discs and CM-PTFE-coated discs were thoroughly investigated by hardness measurements, tribological characterization, wear behavior analysis of discs and pins and chemical elemental mapping. All test results are harmoniously suggesting that the H₂ charging indeed softened the material significantly. The developed double function CM-PTFE coatings can minimize H₂ permeability and also reduce friction, and wear of the components in HRSs.

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氢气阀门应用中化学改性聚四氟乙烯涂层的摩擦学研究

氢脆（HE）会导致加氢站（HRS）中的不锈钢阀门和相关部件发生灾难性故障，从而降低可靠性和安全性并增加成本。在本研究中，探讨了钢基体上的化学改性聚四氟乙烯（CM-PTFE）涂层因其低氢（H2）渗透性和优异的固体润滑性，在降低氢脆敏感性、减少阀门部件摩擦和磨损方面的能力。在 7 × 105 帕斯卡压力下充入 H2 前后，研究了 CM-PTFE 涂层钢样品的固体润滑特性。充入 H2 后，对样品进行了 CHNS 和 X 射线衍射 (XRD) 分析，以分别量化样品吸收 H2 的百分比及其对结晶度的影响。此外，还通过硬度测量、摩擦学表征、盘和销的磨损行为分析以及化学元素图谱，深入研究了充入 H2 对未涂层钢盘和 CM-PTFE 涂层盘的影响。所有测试结果都一致表明，充入的 H2 确实极大地软化了材料。所开发的双功能 CM-PTFE 涂层可最大限度地降低 H2 渗透率，同时还能减少 HRS 中部件的摩擦和磨损。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.