Abstract
The paper presents the test results of the S235JR steel susceptibility to damage under the influence of hydrogen. The test of mechanical properties was performed on the basis of a static stretch test of non-hydrogenated samples and after cathodic polarization. Electrochemical measurements for the assessment of corrosion resistance of non-hydrogenated and hydrogenated steels were carried out using open circuit potential measurement and registering of potentiodynamic polarization curves in a three-electrode measuring system. Hydrogenation was carried out for between 3 and 24 hours in a solution of 0.1 N sulfuric acid (VI) with the addition of 2 mg/dm 3 of arsenic oxide (III) at an electric current density of 10 mA/cm 2 . The hydrogen content in the steel before and after saturation with hydrogen was determined using the analyzer. Fracture samples after tensile test were observed using scanning electron microscope. The results of the research showed that as the hydrogen concentration in the examined steel increased (the lengthening of the saturation time), the deterioration of its mechanical and electrochemical properties occurred.
Highlights
Hydrogen penetration into the construction material occurs both at product’s manufacturing stage and during its exploitation
At the surface of the fractures there were cracks initiated around non-metallic inclusions
The study showed that the duration of cathodic polarization influences the amount of hydrogen absorbed by the tested S235JR steel
Summary
Hydrogen penetration into the construction material occurs both at product’s manufacturing stage and during its exploitation. There are many research results of hydrogen degradation in various materials (steels, alloys) [10,11,12,13], which can be found in reference books The authors of these works have evaluated the destruction of materials based on only one criterion, i.e. mechanical or structural properties. It should be noted that there are not many works presenting the results of research on hydrogen influence on steel degradation which take the change in mechanical properties along with corrosion resistance into account. Since there is little information about the hydrogen degradation of unalloyed structural steels and about the assessment of their degradation according to mechanical properties criterion including corrosion resistance level, these issues have become the subject of the undertaken research.
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