Abstract: A corrosion resistant gas cylinder and gas delivery system includes an electroless nickel-phosphorous layer overlying the inner surface of a steel alloy cylinder. The nickel-phosphorous layer has a thickness of at least about 20 micrometers and a porosity of no greater than about 0.1%. The electroless nickel-phosphorous layer has a phosphorous content of at least about 10% by weight and a surface roughness of no greater than about 5 micrometers. Prior to introducing liquefied gas into the gas cylinder, a cleaning process is carried out using a two-step baking process to clean the surface of the nickel-phosphorus layer. The nickel-phosphorous layer substantially reduces the contamination of liquefied corrosive gasses stored in the gas cylinder by metal from the steel wall surface underlying the nickel-phosphorous layer.
Type:
Grant
Filed:
May 28, 1999
Date of Patent:
September 18, 2001
Assignees:
American Air Liquide Inc., Air Liquide Americas America Corporation, L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation
des Procedes Georges Claude
Inventors:
Alan D. Zdunek, Eugene A. Kernerman, William Korzeniowski
Abstract: A corrosion resistant gas cylinder and gas delivery system includes an electroless nickel-phosphorous layer overlying the inner surface of a steel alloy cylinder. The nickel-phosphorous layer has a thickness of at least about 20 micrometers and a porosity of no greater than about 0.1%. The electroless nickel-phosphorous layer has a phosphorous content of at least about 10% by weight and a surface roughness of no greater than about 5 micrometers. Prior to introducing liquefied gas into the gas cylinder, a cleaning process is carried out using a two-step baking process to clean the surface of the nickel-phosphorus layer. The nickel-phosphorous layer substantially reduces the contamination of liquefied corrosive gasses stored in the gas cylinder by metal from the steel wall surface underlying the nickel-phosphorous layer.
Type:
Grant
Filed:
May 28, 1999
Date of Patent:
March 20, 2001
Assignees:
American Air Liquide Inc., Air Liquide Americas America Corporation, L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation
des Procedes Georges Claude
Inventors:
Alan D. Zdunek, Eugene A. Kernerman, William Korzeniowski