How can I duplicate Devanathan-Stachurski cell in lab?

29 July 2023 1 135 Report

I want to test hydrogen permeation resistance of my coatings that are deposited on Stainless steel.

How can I duplicate DS in lab or is their any other possibility of testing hydrogen permeation of my coatings?

Testing the hydrogen permeation resistance of coatings on stainless steel is crucial for applications where hydrogen diffusion can compromise the material's structural integrity. Hydrogen permeation testing can be carried out using several standard laboratory methods. Here's a guide to help you in setting up a suitable experiment:

Devanathan-Stachurski (DS) Method: The Devanathan-Stachurski (DS) method is well-known for measuring hydrogen permeation through materials. This method involves a double-compartment electrochemical cell where the sample is the separator between the two compartments. One side of the coated sample is exposed to hydrogen evolution reaction, while the other side is monitored for the permeation of atomic hydrogen through the coating. The equipment for the DS method can be found commercially or be custom-built in the lab, following the standard guidelines. This method provides information on the coating's diffusion coefficient and hydrogen solubility.

Other Hydrogen Permeation Testing Methods: Electrochemical Permeation Test: Similar to the DS method, it uses an electrochemical setup to induce hydrogen charging and measure permeation. Gas Permeation Test: This method involves exposing one coating side to a hydrogen gas environment and measuring the hydrogen flux on the other side. Vacuum Techniques: Vacuum methods can be used to expose the coating to hydrogen gas at controlled pressures and temperatures.

Sample Preparation: The coated stainless steel samples must be carefully prepared, ensuring that the coatings are uniform and defects-free. You must seal the edges to ensure that hydrogen permeates only through the coated surface, not the sides.

Test Conditions: Carefully control the temperature, pressure, and hydrogen concentration to mimic real-world conditions as closely as possible. Use appropriate sensors and detectors to measure the hydrogen permeation rate.

Standards and Guidelines:Refer to industry standards and guidelines for hydrogen permeation testing (e.g., ASTM G148) to ensure that your test method aligns with accepted practices.

Expert Consultation:Depending on your specific application and coating technology, you might want to consult with a materials scientist or corrosion expert with experience in hydrogen permeation testing.

Commercial Testing Services:If in-house testing proves too complex, you might consider sending your samples to a specialized testing laboratory with expertise in hydrogen permeation analysis.

By following the correct procedures and ensuring that the experimental setup accurately represents the real-world environment you're interested in, you can obtain valuable insights into the hydrogen permeation resistance of your coatings on stainless steel.

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