Effect of pH in the Range 6.6–14.0+ On the Aerobic Corrosion Fatigue of Steel

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Abstract
The aerobic corrosion fatigue performance of a normalized AISI 1036 steel was determined in a 3 percent NaCl brine of various pH levels from 6.6 to the saturated caustic level (14+). A systematic behavior was observed, a behavior which is believed typical for similar steels. These statistical test findings are summarized in fatigue curve form, and in addition, several special corrosion phenomena are recorded. The principal results are explicable in terms of ferrous hydroxide solubility and oxygen concentration cell behavior as the two primary variables. The oxygen concentration cell system is considered as a pH-sensitive discontinuity to the transformed ferrous hydroxide films. A theory is outlined to explain the principal points observed. Finally, control measure possibilities are suggested. 3.4.7

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