Technische Thermodynamik, Universität Bremen, Germany.
School of Engineering, University of Aberdeen, UK.
Appl Spectrosc. 2018 Dec;72(12):1790-1797. doi: 10.1177/0003702818789700. Epub 2018 Jul 24.
For various industrial manufacturing processes, water-based metalworking fluids (MWFs) are of high relevance due to their cooling and lubricating ability. They commonly form oil-in-water emulsions or solutions and hence their composition and stability is crucial for their performance in the metalworking process. To ensure a long service life of the MWF, intense monitoring is obligatory. However, examination techniques which display comprehensive and precise information about the actual state of the cooling lubricant in use are currently not available. The present study aims at testing the suitability of spectroscopic methods in terms of Fourier transform infrared, Raman, and laser-induced fluorescence spectroscopy for analyzing and monitoring MWFs. It is shown that all three techniques are capable of determining the initial composition, i.e., the ratio of water and concentrate. Fourier transform infrared provides the best performance regarding monitoring the state of the fluid over an extended period of time. The spectral signatures show distinct changes during a five-month service life in a technical environment.
对于各种工业制造工艺，由于其冷却和润滑能力，水基金属加工液（MWF）具有重要意义。它们通常形成油包水乳液或溶液，因此它们的组成和稳定性对于它们在金属加工过程中的性能至关重要。为了确保 MWF 的长使用寿命，必须进行严格的监测。然而，目前还没有显示有关实际使用中的冷却润滑剂的全面和精确信息的检查技术。本研究旨在测试傅里叶变换红外、拉曼和激光诱导荧光光谱学在分析和监测 MWF 方面的适用性。结果表明，这三种技术都能够确定初始组成，即水和浓缩物的比例。傅里叶变换红外在长时间监测流体状态方面表现出最佳性能。在技术环境中，经过五个月的使用寿命后，光谱特征会发生明显变化。
