Slow strain rate tensile tests of forging brass in standard mercurous nitrate solution have been used to find the minimum stress necessary to propagate a crack. Comparison with constant load tests in HgNO3 and also in Mattsson's (NH4)2SO4-CuSO4 solution have verified that the threshold stress can be found rapidly by a slow strain rate test. Crack initiation in a mercury environment is related to the process of slip; in Mattsson's solution an initial incubation period of corrosion preceeds the slip. Stress corrosion cracking (SCC) in Mattsson's solution is accompanied by very acidic conditions within the crack and formation of a clear film on the crack surfaces.

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© 1978 National Association of Corrosion Engineers
1978
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