Corrosion of Carbon Steel in Oxygen and NaCl Concentration Cells: the Influence of Solution Temperature and Aeration

Abstract

Corrosion rate tests were carried out on carbon steel under concentration cells conditions of oxygen and sodium chloride. The effect of aeration in one compartment on the corrosion rate of both coupled metals was determined. In addition, the effects of time and temperatures on the corrosion rate of both coupled metals and galvanic currents between them were investigated. Corrosion potentials for the whole range of operating conditions under concentration cell conditions were also studied. The results showed that under aeration condition, the formation of concentration cell caused a considerable corrosion rate of the Carbon steel specimens coupled in different concentrations of O2 and NaCl due to the galvanic effect. Aerating one compartment caused a noticeable increase in the corrosion rate of the coupled specimen in the other compartment due to the galvanic effect. Increasing temperature caused unstable trends in the free and galvanic corrosion potentials. Increasing the temperature led to an increase in the corrosion rate for both metals.

Evaluation of Corrosion Inhibition of Carbon Steel in Crude Oil by Using Different Green Corrosion Inhibitors and Various Rotation Speeds

“…This, in turn, is due to the fact that the protective films on the surface of c-steel increase in thickness with the increase in the concentration of the inhibitor, which results in a decrease in the diffusion of dissolved oxygen (the main corrosion reason) on the surface of c-steel, and thus causing a decline in the value of the dissolution current density. It is remarkable to note that these findings have been concluded by many researchers [23,24]. Table 4 shows the dissolution current density values graded from low to high as per the type of inhibitor, and they are castor oil, flaxseed oil, sunflower oil and corn oil, respectively.…”

Protection of Carbon Steel from Corrosion by Sulfur Nanoparticles Mixed with Meloxicam Drug

“…Figure (2) shows the topographic structures in 2D and 3D views for sulfur nanoparticle. The result seems to be very smooth surfaces with grains equal to (100.32 nm) [11]…”

“…Tafel plots offered the measurements of: corrosion potentials (Ecorr), corrosion current densities (icorr), weight loss (W.L), penetrations rates (PR), and Protection efficiencies (PE) are shown in Table (2).…”

“…Corrosion is the reaction of metals and element in environment such as oxygen, carbon dioxide, chlorine , etc. , for that, the metal deteriorates .The corrosion damages involves equipment of damage ,materials loss, efficiency is lower, also the corrosion effects on social life such as fire, toxic of products and pollution [1].The substantial difference of corrosion rate between cathode and anode ,the increase corrosion because the oxygen concentration difference for example tanks of steel water was filled in water [2]. The importance of nanomaterial is due to having properties and structure different than atoms , molecules with respect to their bulk materials and size of particles equal 100nm, there are different methods used to produce nanoparticles such as chemical, biological and physical [3].…”