Abstract
The effect of calcareous deposits on hydrogen uptake and embrittlement of API 5CT P110 steel was investigated using the electrochemical hydrogen permeation and slow strain rate techniques. A deposit with two distinct layers was formed at −1000mVSCE, comprising an initial Mg-rich layer followed by a Ca-rich layer whereas at −1500mVSCE the deposit was porous and rich in Mg. The formation of calcareous deposits did not significantly alter hydrogen uptake and embrittlement at −1000mVSCE whereas at −1500mVSCE they were increased. A mechanism was proposed to explain the different roles of calcareous deposits in hydrogen absorption and embrittlement.
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