{
  "$type": "site.standard.document",
  "description": "Provided is a spark plug that is excellent not only in salt resistance but also in stress corrosion cracking resistance. The spark plug includes a metal shell covered by a composite layer including a nickel plating layer and a chromate layer formed on the nickel plating layer. The chromate layer…",
  "path": "/patents/993984",
  "publishedAt": "2013-01-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C23C28/322",
    "NGK SPARK PLUG CO [JP]"
  ],
  "textContent": "Provided is a spark plug that is excellent not only in salt resistance but also in stress corrosion cracking resistance. The spark plug includes a metal shell covered by a composite layer including a nickel plating layer and a chromate layer formed on the nickel plating layer. The chromate layer has a film thickness of 2 to 45 nm and Cr element concentration of not more than 60 at% and contains Ni in addition to Cr.",
  "title": "SPARK PLUG, MAIN FITTING USED FOR SPARK PLUG AND SPARK PLUG MANUFACTURING METHOD"
}