1512 Hadi et al.
Asian J. Chem.
According to Crowe23 the actual biological activity of
ACKNOWLEDGEMENTS
diorganotin compounds of the type RR'SnXY (R and R' = alkyl
or aryl; X andY = anions) is determined solely by the RR'Sn2+
moiety, however the presence of carboxylate or other anions
attached to tin metal was proven to be very important in the
increased activity of the organotin compounds as it has been
observed by many researchers4-15,17. Futhermore, it is believed
that the organotin(IV) corrosion inhibitors offer an excellent
method of protecting various material objects against the
aggressive effects of hostile environment, without limitations
in regard to shape or size of the object to be protected16. It has
been shown by qualitative analysis by immersing the mild steel
into the solution containing inhibitor dibutyltin(IV) compared
to immersing the mild steel into corrosive medium withoug
inhibitor (Fig. 2). The careful observation of the steel surface
with microscope was clearly indicated that the corrosion in
the surface of the mild steel which was immersed with corrosive
medium without inhibitor did occur as shown by the formation
of holes on the surface which is known as wells corrosion24
(Fig. 2a). The addition of dibutyltin(IV) dinitrobenzoate into
the corrosive medium used significantly inhibit the corrosion
process as shown by the less formation of wells corrosion (Fig.
2b). Therefore, corrosion protection is offered by partial or
complete inhibition of the electrochemical reactions16.
The authors are grateful to Directorate of Research and
Community Services, Directorate General of Higher Education,
The Ministry of Education and Cultural of Republic of
Indonesia that provide fund for this project to be undertaken
through Hibah Kompetensi (Competency Research Grant)
Scheme 2014 with contract number of 301/UN26/8/PL/2014.
Thanks also go to Prof. Bohari M. Yamin, Universiti Keban-
gsaan Malaysia for helping in doing microanalysis and Dr. Huy
Hoang of Institute of Molecular Biosciences (IMB) University
of Queensland, Brisbane, Australia for NMR experimentation.
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a
b
Fig. 2. Surface of mild steel (a) corrosive medium without inhibitor and
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Conclusion
The dibutyltin(IV) dinitrobenzoate were continued to be
successfully prepared and it was quite clear that they have
shown some promising results to be used as anticorrosion
inhibitor. Although they are not as strong as other related
derivatives of organotin(IV). However, they are still good to
be used as anticorrosion inhibitors. Further studies are being
carried out to find the best inhibitor and the better way to apply
these compounds and other derivatives for the new generation
of anticorrosion which will be useful for many industries.
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