H.e.f.

Herve Chavanne

Philippe Maurin-Perrier

Smail Aaziz

A molten-salt bath for nitriding mechanical steel parts, essentially consisting of the following (the contents being expressed in wt %): 25 to 60 wt % of alkali-metal chlorides; 10 to 40 wt % of alkali-metal carbonates; 20 to 50 wt % of alkali-metal cyanates; and a maximum of 3 wt % of cyanide ions (formed during the use of the bath), wherein the total of the contents is 100 wt %. Preferably, the bath contains: 25 to 30 wt % of sodium cyanate; 25 to 30 wt % of sodium carbonate and lithium carbonate; 40 to 50 wt % of potassium chlorides; and a maximum of 3 wt % of cyanide ions (formed during the use of the bath), the total of the contents being 100 wt %.

Molten-salt bath for nitriding mechanical parts made of steel, and implementation method

A method for processing parts for kitchen tools in order to protect the parts from scratches, includes sequentially: a nitridation step, optionally including a nitrocarburizing step, between 592 and 750&#xb0; C. in order to promote the formation of a nitrogen austenite layer; and a processing step for promoting the conversion of at least a portion of the nitrogen austenite into a phase with reinforced hardness.

Method of treating parts for kitchen utensils

The invention relates to a superficial treatment method by electrolysis of ferrous surfaces to enhance friction or tread and seizing resistance features, wherein the surfaces provide the electrolysis anode, the electrolysis bath includes a sulphur species, primarily contains water and also contains a chloride salt and a nitrogen species in quantities which facilitates the sulphuration reaction of the surfaces.

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Noalhat, France

Herve Chavanne