TY - JOUR

T1 - An improved performance super high strength copper nickel alloy for use in offshore oil & gas and other marine environments

AU - Tuck, Clive D.S.

AU - Hort, Norbert

AU - Mordike, Barry L.

PY - 1999

Y1 - 1999

N2 - Although resistant to environmental degradation due to hydrogen, super high strength Cu-Ni-Mn-Al cupronickels (typical proof stress 730 N/mm2) without cathodic protection have been shown to be susceptible to stress corrosion phenomena, when stressed to levels which cause significant plastic deformation, in ammoniacal environments or those in which saline solutions are present at temperatures above 50°C. Stress corrosion of Cu-Ni-Mn-Al is principally manifested by the occurrence of a brittle intergranular fracture morphology which is probably due to the operation of an anodic dissolution mechanism. The presence of large grains in some Cu-Ni-Mn-Al alloys appears to be associated with a greater susceptibility to environmental degradation. Improvements in the manufacturing methods used for alloy production have demonstrated that resistance to these phenomena can be achieved for a Cu-Ni-Mn-Al alloy when used in environments encountered by marine fasteners.

AB - Although resistant to environmental degradation due to hydrogen, super high strength Cu-Ni-Mn-Al cupronickels (typical proof stress 730 N/mm2) without cathodic protection have been shown to be susceptible to stress corrosion phenomena, when stressed to levels which cause significant plastic deformation, in ammoniacal environments or those in which saline solutions are present at temperatures above 50°C. Stress corrosion of Cu-Ni-Mn-Al is principally manifested by the occurrence of a brittle intergranular fracture morphology which is probably due to the operation of an anodic dissolution mechanism. The presence of large grains in some Cu-Ni-Mn-Al alloys appears to be associated with a greater susceptibility to environmental degradation. Improvements in the manufacturing methods used for alloy production have demonstrated that resistance to these phenomena can be achieved for a Cu-Ni-Mn-Al alloy when used in environments encountered by marine fasteners.

KW - Amines

KW - Ammonia

KW - Ammoniacal

KW - Copper-nickel

KW - High strength

KW - Hydrogen embrittlement

KW - Marine corrosion

KW - Marine fastener

KW - Seawater corrosion

KW - Slow strain rate testing

KW - Stress corrosion

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85046784881&partnerID=8YFLogxK

M3 - Conference article in journal

AN - SCOPUS:85046784881

JO - NACE - International Corrosion Conference Series

JF - NACE - International Corrosion Conference Series

SN - 0361-4409

IS - 4/1999

T2 - Corrosion 1999

Y2 - 25 April 1999 through 30 April 1999

ER -