EP 2351869 A1 20110803 - Hydrogen diffusion barrier on steel by means of a pulsed-plasma ion-nitriding process
Title (en)
Hydrogen diffusion barrier on steel by means of a pulsed-plasma ion-nitriding process
Title (de)
Wasserstoffdiffusionssperre für Stahl mittels Ionennitrierungsverfahren mit gepulstem Plasma
Title (fr)
Établissement d'une barrière de diffusion de l'hydrogène sur l'acier au moyen d'un procédé de nitruration ionique à plasma pulsé
Publication
Application
Priority
- EP 10186027 A 20031119
- BR 02054191 A 20021220
Abstract (en)
Patente of invention for "Hydrogen Diffusion Barrier on Steel by Means of a Pulsed-Plasmalon-Nitriding Process". The present invention refers to a pulsed-plasma ion-nitriding process performed with the objective of creating hydrogen diffusion barrier on steel, herein exemplified by using the API 5L X-65 steel; high-strength low-alloy steel. The pulsed-plasma ion-nitriding consisted to drive ions and active species of atomic and molecular nitrogen to the material's surface by applying a difference of potential between two electrodes, periodically interrupted with a pre-determined frequency, such that the cathode (1) is the own material or piece to be treated, in a chamber (2) that was previously vacuum pumped (4) and then filled up (6) with the gas nitrogen or a gaseous mixture containing this gas.
IPC 8 full level
CPC (source: EP)
Citation (search report)
- [I] GB 1255321 A 19711201 - LUCAS INDUSTRIES LTD
- [I] US 6490993 B2 20021210 - NEIDHARDT RONALD [DE], et al
- [I] US 4764394 A 19880816 - CONRAD JOHN R [US]
- [I] JP S5531139 A 19800305 - NIPPON DENSHI KOGYO KK
- [I] US 6179933 B1 20010130 - DODD ANDREW [GB], et al
- [I] US 4460415 A 19840717 - KORHONEN ANTTI S [FI], et al
- [A] US 6110571 A 20000829 - YAGINUMA YOSHIKAZU [JP], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 10186027 A 20031119