Study of corrosion resistance of carbon steel in albian water solution in the presence of Chimec as corrosion inhibitor

Study of corrosion resistance of carbon steel in albian water solution in the presence of Chimec as

corrosion inhibitor

N. Boukmouche^a,b, */

a Department of common core L1 and L2, University of Abderrahmane Mira – Bejaïa.

b Laboratory of the Interactions Materials-Environment (LIME), University of Jijel- Algeria

IC-WNDT-MI’16 Jijel- Algeria

*nawboukmouche@yahoo.com

R. Benghanem^c, N. Azzouz^a, F. Kakaa^a, J. P. Chopart^d/

c Department of Materials Science,

Faculty of Mechanical Engineering and Process Engineering, University of Algiers USTHB, Algiers.

d UFR Exact Sciences and Natural

Materials Science and Engineering Laboratory (LISM) - EA 4695, University of Reims Champagne-Ardenne,

Reims, France IC-WNDT-MI’16

Abstract— The N80 steel has been generally used as the main construction material for down hole tubular, flow lines and transmission pipelines in petroleum industry. Electrochemical polarization and electrochemical impedance spectroscopy measurements were performed in order to obtain information on the corrosion behaviour of steel N 80 in the presence of a penetrating Chimec corrosion inhibitor. The investigation was performed in albian water from a well in the Hassi-Messaoud region, in the presence and absence of inhibitor and the effect of temperature on the corrosion was investigated. The electrochemical results indicate that the inhibitor is able to penetrate through the reinforcing steel, minimising steel corrosion.

Index Terms— Corrosion inhibitors, N80 Steel, Albian water, Electrochemical impedance spectroscopy.

I. INTRODUCTION

Corrosion affects all achievements of the engineer, the largest to smallest: energy production [1], civil engineering [2], transport, machinery, medical devices [3], micro-electronic components, etc... In industrialized countries the costs of corrosion are three to four percent of gross national product.

Corrosion is not only wasteful of raw materials and energy, plus it can cause accidents with serious consequences and, in some cases, contribute to pollution of the natural environment [4].

In the petroleum industry and specifically the production of oil and gas, the internal corrosion of pipes and collection of steel surface is a well known phenomenon and is a serious problem.

The goal of our work is to study the efficiency of the Chimec 1038 corrosion inhibitor in the hydrocarbons field against corrosion in albian water from a well in the Hassi- Messaoud region.

II. EXPERIMENTAL

A steel N 80 sample of the following chemical composition (as percentage) was served as working electrode:

TABLE I. CHEMICAL COMPOSITION OF STEEL N80.

C Si Mn Ni Cr P S Mo V Cu

0.45 0.31 0.71 0.02 0.06 0.017 0.019 0.01 0.01 0.01

The working electrode was polished with different grades of SiC papers (400, 600, 800 and1000 in late 4000), degreased with acetone and rinsed with distilled water, before its immersion in the albian water as electrolyte solution with the salinity of 2.30 g/l. Potentiostatic polarization studies were carried out using Potentiostat/Galvanostat PGZ-301.

III. RESULTS AND DISCUSSION A. Absence of inhibitor

-800 -600 -400 -200 0 200 400 600 800 -2

0 2 4 6 8 10 12 14

E [mV/SCE]

T=60°C

T=20°C

I [mA/cm²]

T=40°C

Fig. 1. Polarization curves obtained for the N80 steel immersed in albian water at different temperatures in the absence of inhibitor.

-800 -600 -400 -200 0 200

-3 -2 -1 0 1 2 3

Log I [µA/cm²]

Potential [mV/SCE]

T=20°C T=40°C

T=60°C

Fig. 2. Polarization curves in the absence of inhibitor, Tafel lines.

Increasing the temperature from 20 °C to 40 °C and then at 60 °C, we notice the lowering of the polarization resistance and the increase in the rate of corrosion as well as the corrosion current density I_corr. We can say that as the temperature increases, the steel becomes less resistant to corrosion.

TABLE II. ELECTROCHEMICAL PARAMETERS OF STEEL IN ALBIAN WATER AT DIFFERENT TEMPERATURES IN THE ABSENCE OF INHIBITOR.

Albian water medium

Temperature (°C)

Ecorr

(V/SCE) Rp

(Ohm.cm²) Icorr

(µA/cm²) Vcorr

(mm/years)

Absence of inhibitor

20 - 495.1 225.3 27.92 0.3262

40 55.1 54.07 56.33 0.6588

60 - 110.3 14.52 252.18 2.949

B. Presence of inhibitor (Chimec 2%)

-800 -600 -400 -200 0 200 400 600 800

-4 -2 0 2 4 6 8 10 12

E[mV/SCE]

I [mA/cm²]

T=40°C

T=20°C

T=60°C

Fig. 3. Polarization curves obtained for the N80 steel immersed in albian water at different temperatures in the presence of inhibitor.

According polarization curves (Figure 3) it can be said that the corrosion inhibitor is an anodic behavior that is to say, the potential tends to more positive values so it ennobled.

-800 -700 -600 -500 -400 -300 -200 -100 0 100 -12

-10 -8 -6 -4 -2 0 2

4 ^T=20°C

T=40°C

T=60°C

Log I [µA/cm²]

Fig. 4. Polarization curves in the presence of inhibitor, Tafel lines.

Increasing the temperature from 20 °C to 40 °C and then at 60 °C in the presence of inhibitor (Chimec 2%), we notice the lowering of the polarization resistance and the increase in the rate of corrosion as well as the corrosion current density I_corr. We can say that as the temperature increases, the steel becomes less resistant to corrosion. But, the Chimec improves resistance to corrosion.

Fig. 5. ELECTROCHEMICAL PARAMETERS OF STEEL IN ALBIAN WATER AT DIFFERENT TEMPERATURES IN THE PRESENCE OF INHIBITOR.

Albian water medium

Temperature (°C)

Ecorr

(V/SCE) Rp

(Ohm.cm²) Icorr

(µA/cm²) Vcorr

(mm/years)

Chimec 2%

20 -479.1 218.5 25.89 0.22

40 -50.6 42.6 51.70 1.025

60 56.0 21.93 148.7 1.622

CONCLUSION

In this work we followed the inhibitory action of the corrosion inhibitor A (Chimec-1038) on the corrosion of carbon steel N80. The study was carried out at different temperature water wells (Albian).

In albian water temperature 20 ° C, the corrosion inhibitor has a high protective capacity relative to other temperatures.

The electrochemical results indicate that the inhibitor is able to penetrate through the reinforcing steel, minimizing steel corrosion.

References

[1] K. Mocachi, A. Hamel, A. Zazoua and R. Kherrat. Revue des Energies Renouvelables, vol. 3, pp. 357–362, 2008.

[2] AFGC. Cefracor, Réhabilitation du biton armé dégradé par la corrosion, Centre Français Anti-Corrosion, pp. 55–59, 2003.

[3] B. Grosgogeat, P. Colon, La corrosion, Université Médicale Virtuelle Francophone, pp. 3–14, 2010.

[4] D. Landolt, Corrosion et Chimie de Surfaces des Métaux, , Presse Polytechniques et Universitaire. , Presse Polytechniques et Universitaire, Ramandes, Vol. 12, pp. 20-100, 1993.