Abstract
In this study, the influence of Cu addition on hydrogen entry behavior was investigated with the aim of preventing hydrogen-induced cracking (HIC) in mildly sour environments in which the solution pH is more than 5.0, and a mechanism related to the formation of a protective layer which contributes to the prevention of hydrogen entry was discussed. A hydrogen permeation test was conducted in a solution with a strong pH buffering capacity under 0.1 MPa H2S and 10−3 MPa H2S. In order to clarify the relationship between hydrogen entry and the microscopic structure of corrosion products, corrosion products were characterized by focused ion beam scanning electron microscopy and scanning transmission electron microscopy combined with energy dispersive x-ray spectroscopy. The results indicate that hydrogen permeability, diffusible hydrogen, and the corrosion rate all decreased as a result of Cu addition at 0.1 MPa H2S, and Cu tended to be locally enriched in the inner layer of corrosion product within 100 nm from...
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