High-pressure fluid storage container with oxidation resistance/hydrogen embrittlement resistance through surface treatment

A high-pressure fluid storage container, comprising:

• a container body, which has a storage space for storing high-pressure fluid inside, and a plug coupling portion formed at least on one of both end portions thereof;
• an end plug which is coupled to the plug coupling portion, and has a fluid passage hole formed internally to allow flow of fluid therethrough;
• and
• a sealing unit which is installed in a ring-shaped sealing groove formed between an end surface of the container body and a facing surface of the end plug getting in contact with the end surface of the container body, to seal the interior of the storage space,
• wherein the sealing unit comprises:
• a sealing jacket made of an elastic material fitting into the sealing groove, having an insertion space formed therein with one side being open;
• and
• a compression spring made of a metal material, inserted into the insertion space, and providing an elastic compression force on both sides of the open portion of the insertion space to bring the sealing jacket into contact with the end surface of the container body and the facing surface of the end plug,
• wherein the sealing jacket further comprises a separation prevention protrusion configured to partially cover an opening of the insertion space so as to prevent the compression spring from being separated through the opening, and
• wherein a surface-treated embrittlement-resistant layer is formed in an area where at least the plug coupling portion and the end plug come into contact with each other, to prevent oxidation and hydrogen embrittlement.