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A critical analysis of the literature on pitting corrosion published during the past 35 years is presented. The definition of pitting and the factors influencing this type of attack are considered. An examination of the theories of pitting corrosion and the methods used to study this form of corrosion are also included. 3.2.2

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The corrosion scientist and corrosion engineer are complementary; their efforts are synergistic in solving problems of corrosion control. The broad background of a corrosion engineer capable of covering the entire field of corrosion engineering includes knowledge of chemistry, metallurgy, physical, chemical and mechanical properties of materials, electrical engineering, mechanical engineering, biology, stress analysis, economics, human nature and many other fields. The corrosion scientist and corrosion engineer should regard each other with equal esteem, the only basis for evaluating the other's efforts being quality of work.

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A study was made of corrosion products and their effects on stress corrosion cracking of austenitic stainless steel. Wedging action by solid corrosion products in notches or cracks induces high stresses and eventual failure of specimens by stress corrosion cracking. Data were obtained from stress-relieved and unloaded (externally) specimens so that wedging by corrosion products provided the only source of stress in the specimen. Pressures were measured in excess of 7000 psi due to wedging action of corrosion products. At the base of a notch these pressures developed stresses of the order of magnitude of the yield strength of the metal. Wedging action can provide all the energy required for stress corrosion cracking. A mechanism is proposed which involves a discontinuous type of propagation, with fluctuations occurring over one or a few atomic distances. A running or mechanical type of crack propagation for more than a few atomic distances is ruled out on the basis of the mechanics of the system. 3.4.3, 3.5.8, 6.2.5

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