Method for nitriding metal in salt bath and metal...

C - Chemistry – Metallurgy – 23 – C

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C23C 8/48 (2006.01)

Patent

CA 2565769

Provided is a method for nitriding a metal in a salt bath by using a non-cyanide salt and a nitrided metal manufactured using the same. The method includes the steps of: immerging at least one salt selected from the group consisting of KNO3, KNO2, Ca(NO3)2, NaNO3 and NaNO2 into the salt bath; melting the salt by heating and maintaining the molten salt at a predetermined temperature; and submerging the metal in the salt bath. Nitriding in non-cyanide salts, such as potassium nitrate(KNO3), potassium nitrite(KNO2), sodium nitrate (NaNO3), sodium nitrite(NaNO2), calcium nitrate(Ca(NO3)2) and their mixtures, is capable of solving an environmental pollution problem and reducing a cost. Also, the method is capable of increasing nitrided depth of the metal two to six times compared to conventional nitriding methods. As a result, the method can be carried out in various application fields.

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