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Effect of steel microstructure on bacteria-assisted hydrogen effects at cathodic polarization in sea water

100%

Łunarska E. , Domżalicki P. , Birn J.

tom Vol. 7, nr 1(11)

160-165

The effect of the SRB action on mechanical properties and hydrogen uptake by the steels of quite similar chemical composition but different microstructure bas been studied at cathodic polarization in synthetic sea water. Susceptibility of sorbite steel to the SRB action, as seen from the plasticity los s and hydrogen uptake was higher than that of ferrite-pearlite steels. The sorbite steel revealed also the highest polarization current, highest amount of S.2 in solution and the highest amount of S on the surface of metal tested in the presence of SRB. The made pronounced detrimental effect of SRB produced on sorbite steel was mostly accounted for the presence of Mn, Fe sulfides in the steel microstructure.

Cavitation erosion of P110 steel in different drilling muds

67%

Kmieć M. , Karpiński B. , Szkodo M.

tom Vol. 16, nr 2(48)

57--67

The P110 steel specimens were subjected to ultrasonic cavitation erosion in different compositions of drilling muds and surfactant additive. The test procedure was based on ASTM-G-32 standard recommendations. API 5CT-P110 steel is used for pipes in oil and gas industry. The harsh environment and high velocity of flows poses corrosive and erosive threat on materials used there. The composition of drilling fluid influences its rheological properties and thus intensity of cavitation erosion. The erosion curves based on weight loss were measured.