Investigation of the Effect of Sulfide Inclusions on the Hydrogen Separation of Metal

Abstract

In the presence of an increased concentration of hydrogen, premature destruction of the metal occurs. Hydrogen brittleness is caused by imperfection of the crystal lattice of metals. Distinguish between hydrogen corrosion caused by molecular hydrogen and hydrogen corrosion caused by atomic hydrogen. The presence of hydrogen in a metal increases the fragility of all metals, without exception. Hydrogen accumulates in traps (vacancies, dislocations). The segregations of carbon and other impurity atoms at grain boundaries enhance the ability of iron to capture hydrogen. Atomic hydrogen resulting from electrochemical reactions penetrates steel at normal temperature, causing it to stratify. Molecular hydrogen generated during the processing of hydrocarbons, electrolysis of water, violation of welding technology, penetrates into steel only at temperatures above 200 °C. The aim of the work was to determine non-metallic inclusions using the metallographic method. The authors also determined the presence of sulfide accumulation in the studied metal of the pipe. It is noted that the amount of sulfide inclusions is approximately the same, both near the metal stratification and on the base metal of the sample.