A method for detecting metal corrosion using terahertz time-domain spectroscopy

Abstract

The invention provides a method for detection of metal corrosion by terahertz time-domain spectroscopy. The method includes: measuring the terahertz time-domain spectrums of metal samples with different corrosion time, performing time frequency transformation, and establishing a relationship spectrogram of reflectivity and reaction time; measuring the terahertz time-domain spectrums of corrosion products with different components, performing time frequency transformation, and establishing a relationship spectrogram of reflectivity and the corrosion products with different components; according to the relationship spectrogram of reflectivity and reaction time and the relationship spectrogram of reflectivity and the corrosion products with different components, establishing a relation model of corrosion time and terahertz spectrum signals; measuring the terahertz time-domain spectrum of a to-be-detected sample to obtain the terahertz spectral information of a surface corresponding to the to-be-detected sample and a corrosion product; and introducing the terahertz spectrum information of the to-be-detected sample into the relation model of corrosion time and terahertz spectrum signals so as to determine the corrosion time of the to-be-detected sample. The method provided by the invention can realization of metal corrosion time, and has the advantages of simple operation, good repeatability, and high result precision.

Description

technical field [0001] The invention belongs to the detection field of metal corrosion, and in particular relates to a metal corrosion detection method, specifically a method for detecting the corrosion degree of metal by using terahertz time-domain spectroscopy technology. Background technique [0002] As the main artery of the oil industry, pipelines are extremely important for the transportation of oil and natural gas. However, in the process of service, pipeline corrosion is common, and steel is the main material of pipelines, and its corrosion problems cannot be ignored. In the case of corrosion of steel, the surface roughness changes, and corrosion products of different components are bound to be accompanied. Therefore, detecting the surface condition of steel and the type and content of corrosion products can indirectly characterize the corrosion degree of steel. [0003] Terahertz waves (THz, Terahertz) usually refer to electromagnetic waves with a frequency betwee...

AI Technical Summary

Problems solved by technology

[0004] New metal corrosion detection technologies that have emerged in recent years include electrochemical detection technology, ultrasonic measurement technology, and magnetic flux leakage detection technology, but so far, there is no related technology that uses terahertz time-domain spectroscopy to detect metal corrosion

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