Using specimens made of mild steel (SS-41), fatigue tests were carried out both in air and in the corrosive medium of 1 N sodium sulfate solution acidified to pH 2.2. During fatigue testing, the corrosion potential of a specimen was recorded by a vibrating reed electrometer and the rate of corrosion was determined by colorimetry of total iron in waste solution. The results of potential measurement show that under alternating stress, the potential decreases after keeping a constant value for some hours. By the wet-dry stage fatigue tests, it is confirmed that the period until potential decreases accords with the so-called "Incubation Period", that is concentrated stress at the bottom of corrosion pits just reaches a fatigue limit, with initiation of potential decrease. In the end, the incubation period can be known by potential measurement, and by repetition of a few wet fatigue tests. A curve of stress concentration which rises with numbers of stress cycles under an acidic environment can be traced.

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    TOKYO,   Japan 
  • Authors:
    • Kose, Y
    • Ogawa, Y
  • Publication Date: 1967-3

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  • Accession Number: 00033146
  • Record Type: Publication
  • Report/Paper Numbers: Quart Rpt
  • Files: TRIS
  • Created Date: Jun 16 1976 12:00AM