Paper
RSC Advances
Table 10 Percentage atomic contents of elements obtained from EDX
spectra
3 N. Caliskan and E. Akbas, Mater. Chem. Phys., 2011, 126, 983–
988.
4 N. O. Obi-Egbedi and I. B. Obot, Corros. Sci., 2011, 53, 263–
275.
Inhibitor
Fe
C
N
O
5 D. Daoud, T. Douadi, S. Issaadi and S. Chafaa, Corros. Sci.,
2014, 79, 50–58.
6 B. P. Markhali, R. Naderi and M. Mahdavian, J. Electroanal.
Chem., 2014, 714–715, 56–62.
7 M. A. Hegazy, A. M. Badawi, S. S. Abd El Rehim and
W. M. Kamel, Corros. Sci., 2013, 69, 110–122.
Abraded mild steel
Blank
PTH
PTM
PTMO
73.0
52.1
68.9
66.5
58.9
21.9
40.6
26.6
24.8
32.7
—
—
4.4
4.5
4.1
4.9
7.2
4.2
4.1
4.1
˘
¨
8 A. Ongun Yuce, B. Dogru Mert, G. Karda¸s and B. Yazıcı,
N atoms of the pyrimidine-2-thione derivatives). This data
indicates that pyrimidine-2-thione derivatives molecules
adsorbed on the mild steel surface with percentage atomic
contents listed in Table 10.
Corros. Sci., 2014, 83, 310–316.
9 N. Soltani, M. Behpour, S. M. Ghoreishi and H. Naeimi,
Corros. Sci., 2010, 52, 1351–1361.
˘
¨
10 T. Tuken, F. Demir, N. Kıcır, G. Sıgırcık and M. Erbil, Corros.
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4. Conclusions
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79, 5–15.
12 Y. Tang, F. Zhang, S. Hu, Z. Cao, Z. Wu and W. Jing, Corros.
Sci., 2013, 74, 271–282.
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14 M. A. Hegazy, M. Abdallah, M. K. Awad and M. Rezk, Corros.
Sci., 2014, 81, 54–64.
15 A. M. Fekry and R. R. Mohamed, Electrochim. Acta, 2010, 55,
1933–1939.
16 Y. Tang, X. Yang, W. Yang, Y. Chen and R. Wan, Corros. Sci.,
2010, 52, 242–249.
17 F. M. Mahgoub, B. A. Abdel-Nabey and Y. A. El-Samadisy,
Mater. Chem. Phys., 2010, 120, 104–108.
18 V. S. Reznik, V. D. Akamsin, Y. P. Khodyrev,
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Tahawy, Corros. Sci., 2010, 52, 2387–2396.
Three pyrimidine-2-thione derivatives were synthesized and
tested as possible corrosion inhibitors for mild steel in 1.0 M
H2SO4 solution. According to results obtained, the following
points can be emphasized:
1. Pyrimidine-2-thione derivatives effectively inhibited the
corrosion of mild steel in 1.0 M H2SO4 solutions to different
extents, with PTH and PTM being slightly more effective than
PTMO.
2. EIS plots indicate that the compounds increased the
charge-transfer resistance of the corrosion process via adsorp-
tion on the metal/corrodent interface, and hence the inhibition
performance improved with inhibitor concentration.
3. Polarization curves demonstrated that the pyrimidine-2-
thione derivatives were mixed-type inhibitors for mild steel
surface corrosion in the acid solution.
4. The adsorption of pyrimidine-2-thione derivatives was well
described by Langmuir isotherm model under all of the studied
temperatures.
21 J. Aljourani, M. A. Golozar and K. Raeissi, Mater. Chem. Phys.,
2010, 121, 320–325.
22 X. Wang, H. Yang and F. Wang, Corros. Sci., 2011, 53, 113–121.
23 F. Bentiss, M. Traisnel, N. Chaibi, B. Mernari, H. Vezin and
5. Quantum chemical calculations show that the area con-
taining S atom is most possible site for bonding with the mild
steel surface by donating electrons to the metal. Methoxy
substituent-induced steric hindrance was implicated in the
reduced inhibition performance of PTMO, although the elec-
tron releasing ability of the same methoxy substituent rendered
the PTMO molecule more nucleophilic.
´
M. Lagrenee, Corros. Sci., 2002, 44, 2271–2289.
´
24 M. Lebrini, F. Bentiss, H. Vezin and M. Lagrenee, Appl. Surf.
Sci., 2005, 252, 950–958.
25 F. Bentiss, M. Traisnel and M. Lagrenee, Corros. Sci., 2000,
42, 127–146.
26 Z. Tao, S. Zhang, W. Li and B. Hou, Corros. Sci., 2009, 51,
2588–2595.
27 S. Deng, X. Li and H. Fu, Corros. Sci., 2011, 53, 822–828.
Acknowledgements
Authors would like to appreciate the nancial support from
Kashan University and Payame Noor University for provision of
laboratory facilities during the period that this research was
conducted.
´
´
28 R. Alvarez-Bustamante, G. Negron-Silva, M. Abreu-Quijano,
´
´
H. Herrera-Hernandez, M. Romero-Romo, A. Cuan and
´
M. Palomar-Pardave, Electrochim. Acta, 2009, 54, 5393–5399.
29 N. R. Mohamed, M. M. T. El-Saidi, Y. M. Ali and
M. H. Elnagdi, Bioorg. Med. Chem., 2007, 15, 6227–6235.
30 M. Benabdellah, R. Touzani, A. Dafali, B. Hammouti and
S. El Kadiri, Mater. Lett., 2007, 61, 1197–1204.
31 M. Frisch, G. Trucks, H. Schlegel, G. Scuseria, M. Robb,
J. Cheeseman, V. Zakrzewski, J. Montgomery Jr,
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RSC Adv., 2015, 5, 11145–11162 | 11161