Corrosion inhibition of carbon steel in sulfuric acid using green inhibitor

I am a Researcher (9th Cycle)

Mohammed Al-rasheed, Abdulrahman Al-mansouri, Khalifa Al-naimi, Abdulrahamn Al-Amarri

Supervised by :Dr. Yahia Hussein Shoeb Mr. Mostafa Hussein Ramadan

Sukari Group - Omar Bin Al-khattab

Outlines

• Introduction• Aim of Research• Experimental Techniques• Result & discussion• Impacts of the Research in Qatar.• Conclusions

Introduction

What’s Corrosion? It’s the spontaneous destruction of material as a

result of interaction with the surrounding environment.

Corrosion causes many negative effects on our daily life;

bridges may collapse, cars may lose control and pipes may leak and lose carrying capacity.

Corrosion problems :

Methods of corrosion control

Cathodic Protection

Coating

Inhibitors

Aim of our research

To study the efficiency of a new green inhibitor the (4-amino-triazole-3-thiol) to control the corrosion of carbon steel in acidic media

Experimental techniques

1. WEIGHT LOSS

2. POTENTIODYNAMIC POLARIZATION

3. SEM-EDX

1. Carbon steel sheets

Materials and Equipment

A. Materials

2. Sulfuric acid solution

3. 4-amino-triazole-3-thiol

5. SiC emery papers grades 180-1000

4. Diamond paste 6, 3 and 1

Materials and Equipment

B. Equipments

Polishing machine

Analytical balance

Potentiostat

Scanning electron microscope

Weight loss1 2

43

Potentiodynamic Polarization

SEM-EDX Analysis

Result & discussion

Weight loss resultsElectrolytic solution Corrosion rate

mg/cm2

Inhibition efficiency %

1M H2SO4 31543.3 -1M H2SO4 + 0.01mM triazole

23657.5 25.1

1M H2SO4 + 0.05 mM triazole

19493.8 38.2

1M H2SO4 + 0.1 mM triazole

12585.8 60.1

1M H2SO4 +0.5 mM triazole

1230.2 96.2

Blank 1 x 10-5 5 x 10-5 1 x 10-4 5 x 10-40

20

40

60

80

100

1M H2SO4

1M H2SO4+ 1 x 10-5 M TRIAZOLE

1M H2SO4+ 5 x 10-5 M TRIAZOLE

1M H2SO4+ 1 x 10-4 M TRIAZOLE

1M H2SO4+ 5 x 10-4 M TRIAZOLE

Eff

icie

ncy

, %

Concentration, M

-7 -6 -5 -4 -3 -2 -1

-1.1

-1.0

-0.9

-0.8

-0.7

-0.6

-0.5 C-Steel + 1 M H2SO4

C-Steel + 1 M H2SO4+ 1.0 x 10-5

C-Steel + 1 M H2SO4+ 5.0 x 10-5

C-Steel + 1 M H2SO4+ 1.0 x 10-4

C-Steel + 1 M H2SO4+ 5.0 x 10-4

E, m

V (

SC

E)

log i/A, A/cm2-0.00006 -0.00004 -0.00002 0.00000 0.00002 0.00004 0.00006

-0.88

-0.86

-0.84

-0.82

-0.80

-0.78

-0.76

-0.74

-0.72 C-Steel + 1 M H2SO4

C-Steel + 1 M H2SO4+ 1.0 x 10-5

C-Steel + 1 M H2SO4+ 5.0 x 10-5

C-Steel + 1 M H2SO4+ 1.0 x 10-4

C-Steel + 1 M H2SO4+ 5.0 x 10-4

E, m

V (

SC

E)

i, A

Polarization Curves

potentiodynamic curves for C-Steel in 1 M H2SO4 with different concentrations of Triazole

linear curves for C-Steel in 1 M H2SO4 with different concentrations of Triazole

Potentiodynamic Polarization results

Inhibitor concentration, mol. L-1

Ecorr,

(mV)iCorr, µA a c

Corrosion rate / mpy

Inhibition efficiency (%)

Blank - 867.2 4.95 x103 226.5 186.4 2.272 x 103 -

1.0 x 10-5 -893.1 3.20 x103 223.4 134.3 1.469 x 103 35.35

5.0 x 10-5 -929.1 904.1 221.6 98.4 416.5 81.73

1.0 x 10-4 - 930.2 137.7 217.4 91.35 63.15 97.22

5.0 x 10-4 - 932.2 74.38 215.9 87.39 34.10 98.50

EDX Analysis

SEM Analysis

Untreated Carbon Steel

Carbon Steel + H2SO4

Bare surface After immersion in 2 M H2SO4 for 3 hrs

Carbon Steel + H2SO4

+ Triazole

After immersion in 2 M H2SO4 containing 2x10-3 M

triazole

EDX Analysis

Carbon SteelCarbon Steel +

H2SO4

Carbon Steel + H2SO4

+ Triazole

The Economical impact in Qatar:

Oil and gas constitute one of the most important industries in Qatar and corrosion presents a big challenge to them so it is very important to control the corrosion process to reduce the economic loss.

Conclusion

Aminotriazole thiol is a highly efficient green inhibitor for carbon steel specially at concentration higher than 0.5x10-3 M.

Aminotriazole thiol inhibition takes place via chemical adsorption on steel surface as revealed from EDX analysis.

AcknowledgmentThanks to all who worked on this program from organizers to doctors and

teachers.• Dr. Noora Al-Thani and the I’m Researcher Team• Dr. Yahia Hussein Shoeb and Mr. Mostafa Hussein Ramadan• Mrs. Marwa gaboub• Mrs. Noura Al Qahtani• Special thanks to Al-bairaq, the CAM (Center For Advanced Material ) ,

CLU (Central Lab Unit ) and to all the sponsors, UNESCO , Qatar National Commission for Education, Culture and Science , Ras Gas, Maersk oil, Qatar-Shell.

• Omar Bin Al khattab Secondary School For Boys

I am a Researcher (9th Cycle)