This paper provides a summary of information on the corrosion resisting characteristics of the iron modified 90/10 cupro nickel alloy which is currently being substituted for cupro nickel alloys of higher nickel content, particularly where resistance to attack by salt water is required. Following a brief review of the history of the alloy, information is included on the influence of iron content and heat treatment. Behavior of the alloy under several conditions of exposure to attack by sea water will be described. These conditions will include quiet immersion, exposure at moderate velocity and at high velocity. With regard to the latter, data are presented as secured by jet impingement tests, erosion tests of various sorts, tests in model condensers and in piping systems. The article includes information on fouling characteristics and galvanic behavior.
In addition to data referring to clean sea water, some experiences in sulfide polluted water are described. Appended also is available information on behavior of the alloy in corrosive media other than salt water. Appropriate attention is given welded and brazed joints, and some information is included on physical and mechanical properties and heat transfer characteristics of the alloy.
