Share
تاكل الفولاذ الكاربوني تحت ظروف الخلط في وسط ثنائي الطور لمحلول ملحي مع زيت الغاز وثنائي اوكسيد الكاربون والسيطرة علية بالحماية الكاثودية == Corrosion of Carbon Steel In Stirred Two Phase Media of Brine - Gas Oil And Brine - CO2 And Prevention By Cathodic Protection
Author name:
ساهر محمد عزيز
General topic:
Chemical Engineering
Specific topic:
Chemical Engineering
Degree:
Master
University:
Al-Nahrain University
Language:
English
Full text from the source:
https://nahrainuniv.edu.iq/sites/default/files/Combined_321.pdf
University location:
Baghdad
First pages:
38T295 - p.pdf
Abstract:
Corrosion tests of carbon steel (CS) in single and two phase media of two immiscible liquids (CaCO3 solution - gasoil mixture) and liquid - gas (CaCO3 solution - CO2 gas) under different operating conditions of temperature, agitation velocity, phase fractions, gas flow rate, and immersion time were carried out using weight loss method and electrochemical polarization technique. Flat blade disc turbine mixer was used to simulate the two phase flow conditions.The ranges of operating parameters in two immiscible phase tests were agitation velocities of (0 - 1200 rpm), temperature of (25 - 45 oC), (1 - 10 vol %) gas oil. The effect of presence of acids such as HCl and H2SO4 on corrosion rate was also investigated under different conditions.Corrosion rate (iL) measurements in CO2 saturated solution were also attained in different operating conditions of temperatures(25 - 45 oC), agitation velocity (0 - 800 rpm), salts concentrations (2.5 × 10 - 3 to 9.9 × 10 - 3M), CO2 flow rate (0.142 to1.132 m3/h ), and immersion time by determining the limiting current density.The pH values, oxygen solubility, and electrical conductivity of tested solutions were measured under all to interpret the obtained result.The results revealed that increasing agitation velocity and temperature leads to an increase of the corrosion rate in single phase brine solution. The corrosion rate in brine - gasoil mixture is irregularly varied with concentration of gasoil and agitation velocity. The limiting current density in single phase CaCO3 increases with the increase in agitation velocity, concentration of brine, and temperature. The corrosion rate in two phase brine - CO2 mixture decreases with the increase of agitation velocity flow rate of CO2, temperature, and immersion time. The corrosion potential of Carbon steel under various conditions were determined and discussed.Cathodic protection was used to protect carbon steel in brine - CO2 mixture by using zinc as sacrificial anode under different operating conditions of flow rate of CO2, agitation velocity, and temperature. Good corrosion protection efficiency was attained.
