Relationship of pH to Aerobic Corrosion Fatigue Life of Steel

Abstract

IT is often of some importance, as in marine service and in the petroleum industry, to know how various pH levels affect the room temperature corrosion fatigue life of a steel. We have performed a statistical-type, R. R. Moore machine, fatigue study of a normalized-only A.I.S.I. 1036 steel with the results shown in Fig. 1. The tensile strength was 100,000 p.s.i. ; the yield strength was 68,400 p.s.i. ; and the per cent elongation (2 in.) was 30 per cent. A 3 per cent sodium chloride solution was used, this with a shaped capillary film glass feeder system. One curve was determined with a sodiumhydroxide-saturated, 3 per cent sodium chloride solution. Etching (Fig. 2) was observed therein—no caustic embrittlement whatever was noted.