EP 0524037 B1 19950419 - Treatment process for iron components to improve simultaneously their corrosion resistance and their friction properties.
Title (en)
Treatment process for iron components to improve simultaneously their corrosion resistance and their friction properties.
Title (de)
Behandlungsverfahren für Werkstoffe aus Eisen zur gleichzeitigen Verbesserung ihrer Korrosionsfestigkeit und ihrer Verschleisseigenschaften.
Title (fr)
Procédé de traitement de pièces en métal ferreux pour améliorer simultanément leur résistance à la corrosion et leurs propriétés de friction.
Publication
Application
Priority
FR 9108946 A 19910716
Abstract (en)
[origin: EP0524037A1] The components are nitrided, preferably in a bath of molten salts based on CNO<-> cyanate ions, are oxidised, preferably in baths of molten oxidising alkali metal salts, and are then impregnated with a hydrophobic wax. According to the process the nitriding followed by the oxidation results in the formation of a layer consisting of a compact deep underlayer and of a porous surface underlayer whose thickness is between 5 and 25 mu m and exhibits open porosities between 0.2 and 3 mu m in diameter. The impregnating wax is an organic compound of high molecular weight of between 500 and 10,000, with a surface tension of between 10 and 73 mN/m in the liquid state, the contact angle between the solid phase of the surface layer and the wax in the liquid state being between 0 and 75 degrees. Applications: treatment of precision components made of ferrous metal of complex shape, simultaneously subjected to severe stresses by friction and corrosion.
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
Designated contracting state (EPC)
BE CH DE ES GB IT LI
DOCDB simple family (publication)
EP 0524037 A1 19930120; EP 0524037 B1 19950419; BR 9202658 A 19930316; DE 69202114 D1 19950524; DE 69202114 T2 19951012; ES 2071455 T3 19950616; FR 2679258 A1 19930122; FR 2679258 B1 19931119; JP 2502243 B2 19960529; JP H05195194 A 19930803; KR 100213670 B1 19990802; KR 930002535 A 19930223; TW 223663 B 19940511; US 5346560 A 19940913
DOCDB simple family (application)
EP 92401633 A 19920612; BR 9202658 A 19920713; DE 69202114 T 19920612; ES 92401633 T 19920612; FR 9108946 A 19910716; JP 18803292 A 19920715; KR 920012368 A 19920711; TW 81104531 A 19920610; US 89692892 A 19920611