Examining of the Corrosion Inhibition of Carbon Steel in Crude Oil Using a Sodium Nitrate Inhibitor at Different Rotational Velocities

Authors

  • Ban Ali Hasan , Shaker Salih Bahar

Abstract

In this study, the effect of some variables on the corrosion rate of carbon steel in
crude oil medium has been studied with weight loss technique. The test system was designed
to measure corrosion rate . The medium of experiments was crude oil. The performance of
corrosion process of carbon steel was tested at temperatures of ( 20, 30, 40, 50, and 60) ,
rotational velocities of ( 0, 1000,and 2000) rpm, NaNO3 inhibitor concentrations of (0, 0.5,
and 1.1 ) g/l . The results showed that the corrosion rate decreased with increasing inhibitor
concentration in crude oil, but increased with increases of rotational velocity and
temperature, temperature affected the corrosion rate by changing two main parameters,
oxygen solubility and diffusivity. It has been showed the best efficiency of NaNO3 as
chemical inhibitor in crude oil was 98% at temperature of 20 , 1.1 g/l concentration and 0
rpm rotational velocity. The experimental results were quantified using non-linear curve
fitting technique by Hooke-Jeeves and quasi-Newton method which were included in
statistical program package at different concentration of NaNO3 inhibitor in crude oil, the
following equations have been found:
1.For using 0.5 g/l NaNO3,
Sh=1.26 Re0.025Sc0.0087 ,With correlation coefficient C.C = 0.89 and mean error 5.42%
2. For using 1.1 g/l NaNO3
Sh=1.04 Re0.025Sc0.0113
, With correlation coefficient C.C = 0.92 and mean error 2.68%

Published

2020-12-01

Issue

Section

Articles