Done by: Sukari group School name; Omar Bin Khattab secondary school for boys. The project aimed to study how the investigated triazole derivative controls the corrosion of mild steel in sulfuric acid solutions. The corrosion rates in absence and presence of different concentrations of inhibitor will be measured using weight loss and potentiodynamic polarization techniques. Also, the effect of inhibitor on surface morphology of carbon steel will be investigated using scanning electron microscope.

1. 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

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

3. Introduction
What’s Corrosion?
It’s the spontaneous destruction of material as a
result of interaction with the surrounding
environment.

4. 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 :

5. Methods of corrosion control
Cathodic Protection
Coating
Inhibitors

6. 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

7. Experimental techniques
1. WEIGHT LOSS
2. POTENTIODYNAMIC POLARIZATION
3. SEM-EDX

8. 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

9. Materials and Equipment
B. Equipments
Polishing machine
Analytical balance
Potentiostat
Scanning electron microscope

10. Weight loss
1 2
43

11. Potentiodynamic Polarization

12. SEM-EDX Analysis

13. Result & discussion

14. Weight loss results
Electrolytic 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

15. Blank 1 x 10-5 5 x 10-5 1 x 10-4 5 x 10-4
0
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
Efficiency,%
Concentration, M

16. -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 H2
SO4
C-Steel + 1 M H2
SO4
+ 1.0 x 10
-5
C-Steel + 1 M H2
SO4
+ 5.0 x 10
-5
C-Steel + 1 M H2
SO4
+ 1.0 x 10
-4
C-Steel + 1 M H2
SO4
+ 5.0 x 10
-4
E,mV(SCE)
log i/A, A/cm
2
-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 H2
SO4
C-Steel + 1 M H2
SO4
+ 1.0 x 10
-5
C-Steel + 1 M H2
SO4
+ 5.0 x 10
-5
C-Steel + 1 M H2
SO4
+ 1.0 x 10
-4
C-Steel + 1 M H2
SO4
+ 5.0 x 10
-4
E,mV(SCE)
i, A
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

17. 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

18. EDX Analysis

19. 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

20. EDX Analysis
Carbon Steel
Carbon Steel +
H2SO4
Carbon Steel + H2SO4
+ Triazole

22. 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.

23. 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.

24. Acknowledgment
Thanks 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)