Abstract
Abstract The fatigue crack growth behavior of a CMn steel and its weldments in seawater containing low concentrations of H2S, in the range of 10 to 150 ppm, has been established. The tests were designed to simulate a hydrogen sulfide environment, which may exist under marine foulings on submerged structures, as a result of the anaerobic activity of sulfate-reducing bacteria. In the absence of H2S, the increase in crack growth rate in seawater compared to that in air was due to a combination of anodic dissolution and hydrogen embrittlement at the crack tip. Under cathodic protection (CP) of −1.0 V (SCE), the anodic dissolution was suppressed and the da/dN vs ΔK curves showed plateau behavior in the intermediate ΔK range, with higher crack growth rates compared to free corrosion. Weldments, in general, showed faster crack growth rates compared to the base plate. Appropriate concentrations of hydrogen sulfide in seawater were achieved by bubbling H2S/N2 gas mixtures with specific volume fractions of H2S in p...
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