Hydrogen Embrittlement Measurement and Evaluation Methods
Hydrogen Embrittlement Measurement and Evaluation Methods
Hydrogen concentration measurement plays a crucial role in assessing hydrogen embrittlement. Below, we provide a detailed explanation of the main hydrogen concentration measurement methods, their characteristics, and representative equipment.
Detailed Overview of Hydrogen Concentration Measurement Methods
1. Thermal Desorption Spectroscopy (TDS) / Thermal Desorption Analysis (TDA)
Overview
This method involves heating a sample to release the hydrogen contained within it and measuring the amount of hydrogen released. By analyzing the relationship between the amount of released hydrogen and temperature, it is possible to evaluate the hydrogen accumulation state and binding form in the sample.
Features
High-sensitivity measurement: Capable of detecting hydrogen at the ng/g (ppb) level.
Fast measurement: By increasing the heating rate, multiple measurements can be performed per day.
Large sample compatibility: Can accommodate samples up to 30×30×30 mm, making it suitable for various sample types.
Representative Equipment
CryoTDS-100H2 (ESCO Ltd.)
Key Features:
High-speed detection: Capable of measuring hydrogen every second, which is approximately 300 times faster than conventional methods (once every 5 minutes).
Ultra-high vacuum environment: Heating the sample in an ultra-high vacuum environment enables direct detection of released hydrogen, ensuring high-precision measurements.
Easy operation: Simply place the sample on the stage, close the lid, and press the start button to begin measurement.
Low-temperature measurement capability (under development): A function is being developed to detect hydrogen trapped in iron lattice defects at low temperatures.
More Information:
escoltd.co.jp
2. Electrochemical Hydrogen Permeation Test
Overview
This method involves supplying hydrogen to one side of a sample and measuring the amount of hydrogen that permeates through to the other side using an electrochemical detection system. It enables real-time evaluation of hydrogen diffusion behavior and permeability.
Features
Real-time evaluation: Allows for the direct observation of hydrogen permeation behavior as it occurs.
Quantitative data acquisition: Enables precise measurement of the amount of hydrogen permeated through the sample.
Representative Equipment
H-Permeation Analyzer (TOYO Corporation)
Key Features:
High-sensitivity detection: Capable of detecting trace amounts of hydrogen permeation.
Temperature control: Allows for precise control of the sample temperature, making measurements under various conditions possible.
More Information:
connect.nissha.com
3. Gas Chromatography (GC)
Overview
In this method, a metal sample is sealed in a container and heated, releasing hydrogen gas, which is then analyzed using gas chromatography. This method enables high-sensitivity, quantitative analysis of hydrogen.
Features
High-sensitivity analysis: Capable of detecting and quantifying trace amounts of hydrogen gas.
Simultaneous multi-component analysis: Can analyze other gas components in addition to hydrogen.
Representative Equipment
GC-2014 (Shimadzu Corporation)
Key Features:
High detection sensitivity: Enables high-precision analysis of trace components.
Versatility: Can be used for a wide range of samples and analytical applications.
More Information:
shimadzu.co.jp
Comparison of Hydrogen Concentration Measurement Methods
The table below compares the key features of the hydrogen concentration measurement methods discussed above.
Each method has unique advantages, and selecting the most appropriate method depends on the purpose of measurement and sample characteristics.