Here are a few methods through which hydrogen embrittlement can be prevented:
Minimizing Contact Between Any Source Of Atomic Hydrogen And Metal:
Reducing the amount of metal-to-atomic hydrogen contact can help avoid hydrogen embrittlement. Environmental factors should be managed in potentially corrosive services to prevent reactions on the metal surface from producing hydrogen ions. In real terms, this means that the metal needs to be shielded from surroundings that promote corrosion, such as by applying coatings, or it needs to be kept out of such situations. Processes that include acid pickling or that provide cathodic protection should have their electrochemical conditions regulated to prevent the release of hydrogen at the component surface. Before very low temperatures are attained, hydrogen can be allowed to escape from furnace atmospheres containing hydrogen for heat treatment.
There may always be some hydrogen absorption, depending on the welding technique used. Therefore, it may be important to carefully regulate the welding conditions for hardenable steels to restrict the amount of hydrogen absorbed, prevent the creation of microstructures that are too hard, or allow hydrogen to escape before the workpiece reaches critical low temperatures.
Thermal Exposure:
By adopting a thermal exposure technique, commonly referred to as a “baking” procedure, which permits hydrogen to escape before exposure to extremely low temperatures, embrittlement issues can be avoided if considerable volumes of hydrogen are predicted to be absorbed during a certain processing activity. Certain equipment types use shutdown procedures that regulate cooling rates to allow hydrogen levels to drop to an appropriate level before very low temperatures are achieved.
Material Selection:
Selecting materials, or utilizing materials that are less susceptible to hydrogen embrittlement, is another way to stop the embrittlement issue.
Example: In hydrogen sulfide environments, the ISO 15156 Standard specifies hardness limitations for materials that are not going to be susceptible to SSC.
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