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13.
Corrosion leakings of botton of vessels for hydrocarbons = Korozijski prodori dna jeklenih rezervoarjev za ogljikovodike
Vojvodič-Tuma, Jelena
Vessels for liquid hydrocarbons, the biggest in Slovenia has the volume of 60.000 m[sup]3, are welded from structural or microalloyed steels. These steels are corrosion resistant to hydrocarbons, ...however, corrosion my be induced by impurities. A special form of stress corrosion was observed in the case of presence of hydrogen sulfide (H[sub]{2}S). This compond reacts with iron, atomic hydrogen is dissolved in steel, it diffuses to areas of tensile stresses, increases the local brittleness and causes local transgranular cracks. Especially, welding areas are prone to such damage. Different damages have been observed on corrosion not protected bottoms or with damaged protection layer. Water present as impurity is sedimented on the bottom and it is incompletely drained. Local steel corrosion may start on bottom points with increased corrosion potential. The corrosion rate is greater because the anodic area is small and the cathodic much greater and it rate is increasing because if the increasing difference in oxygen between the pit surface and vessel bottom. In this way, leakage point of size of some mm are formed. Much greater leakages of diameter of some cm may be formed if a greater current by several orders of magnitude than the standard corrosion current, is generated by an external surce and it is conducted to the bottom through the legs of the moving vessel roofing.
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