Transgranular Stress-Corrosion Cracking

Authors: Howard, D.; Pyle, T.

Source: British Corrosion Journal, Volume 3, Number 6, November 1968 , pp. 301-304(4)

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Abstract:

The rates of dissolution of atoms from steps of different widths on a metal surface are calculated. It is shown that there is a critical spacing, below which the rate of dissolution possible from a step falls rapidly. This critical spacing is related to the solution viscosity and hence the solution composition and temperature by the relationship:

l _crit = 8 παb³η10¹³ √2V₂(ε_s − ε_∞)/ε_s ²KT³ For a stainless steel immersed in 42% MgCl₂ solution at 150°, the calculated critical value of the slip line spacing is 6 × 10⁻⁵cm. This agrees well With the experimental observations, as a steel which has a spacing of 4 × 10⁻⁵ cm. takes fifty times longer to fail in a stress-corrosion test under these conditions than does a steel with a spacing of 7 × 10⁻⁵ cm. The reactivities of steps of different widths on copper alloys are also calculated and it is shown that slip line spacings found in cold worked copper-zinc alloys containing between 10–30% Zn lie in the critical range where the reactivity of the step changes rapidly with step width.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/000705968798325849

Publication date: 1968-11-01

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