The influence of static and dynamic hydrogen charging on the corrosion and hydrogen embrittlement properties of 1 000 MPa high-strength steel
The corrosion and hydrogen embrittlement properties of 1 000 MPa high-strength steel in seawater were studied through electrochemical experiments under constant potential hydrogen charging conditions and slow strain tensile tests after static and dynamic hydrogen charging.The results show that after electrochemical hydrogenation,the self-corrosion potential of the material shifts negatively,the corrosion thermodynamic tendency is increased.The hydrogen evolution potential slightly shifts positively,and the hydrogen evolution tendency is increased.The static and dynamic hydrogen charging tensile tests of high-strength steel show that after hydrogen charging,the fracture mode of the metal changes from toughness to cleavage and intergranular fracture direction,and the hydrogen embrittlement performance is enhanced.The degree of embrittlement and damage caused by static hydrogenation is much higher than that caused by dynamic hydrogenation.Compared to the prolongation of static hydrogenation time,the effect of polarization potential on the hydrogen embrittlement performance of materials is more significant.
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