{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "Provided is a shock absorber in which trivalent chromium is used to achieve both high hardness and low frictional force at a high level without using hexavalent chromium which is suspected of causing damage to the human body and the environment, and a method for manufacturing the shock absorber. A…",
  "path": "/patents/1114561",
  "publishedAt": "2026-05-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C25D5/611",
    "Hitachi Astemo, Ltd."
  ],
  "textContent": "Provided is a shock absorber in which trivalent chromium is used to achieve both high hardness and low frictional force at a high level without using hexavalent chromium which is suspected of causing damage to the human body and the environment, and a method for manufacturing the shock absorber. A shock absorber () of the present invention includes: a cylinder () which is filled with hydraulic oil (); a piston rod () which is movable in the cylinder (); and an oil seal () which is fixed to the cylinder () and slides on the piston rod (), in which a hard layer mainly containing chromium obtained from a trivalent chromium plating bath is provided on a surface of the piston rod (), and the hard layer contains both a crystalline material and an amorphous material, and also contains an additive other than chromium.",
  "title": "SHOCK ABSORBER AND METHOD FOR MANUFACTURING SHOCK ABSORBER"
}