%A FADHIL RAMADITO MUHAMMAD 
%T STRUCTURE ELUCIDATION OF 4-VINYLPYRIDINE DIMER
AND ACTIVITY TESTS AS CORROSION INHIBITOR FOR
MILD STEEL IN CO2?SATURATED BRINE SOLUTION
%X 
The dimerization of 4-vinylpyridine monomer has been carried out through
oxidative coupling method using methanol as a solvent and hydrochloric acid (HCl)
as a catalyst. The dimerization product was compared with its monomer using thin
layer chromatography (TLC) and fourier transform infrared (FTIR) spectroscopy.
Molecular weight screening and compound structure elucidation were carried out
using liquid chromatography-mass spectrometry (LC?MS) for identification of
4-vinylpyridine dimer, D(4-VP). D(4-VP) was evaluated as a corrosion inhibitor
for mild steel in a brine solution saturated with CO2 using wheel test method.
Mild steel surface morphology analysis was performed using scanning electron
microscope (SEM). The D(4-VP) was appeared as a transparent yellow diluted
liquid. TLC and FTIR results showed a slight difference between monomer and
D(4-VP) by the spots and functional groups, respectively. LC?MS screening result
showed that the formation of D(4-VP) identified at retention time of 6.18, 6.59, and
16.22 minutes. The wheel test of D(4-VP) showed a corrosion inhibition activity,
where an inhibition efficiency (IE) increased with an increase of D(4-VP)
concentration. The highest IE (63.12%) was reached out at the highest concentration
used (200 mgL?1). Mild steel protection was also supported by a surface
visualization using SEM.
Keywords: mild steel, CO2 corrosion, corrosion inhibitor, 4-vinylpyridine
dimer, oxidative coupling.

Dimerisasi 4-vinilpiridin telah dilakukan dengan menerapkan metode kopling
oksidatif menggunakan pelarut metanol dan katalis asam klorida (HCl). Produk
hasil dimerisasi dibandingkan dengan monomernya menggunakan kromatografi
lapis tipis (KLT) dan spektroskopi fourier transform infrared (FTIR). Screening
berat molekul dan elusidasi struktur senyawa dilakukan menggunakan kromatografi
cair?spektrometri massa (LC?MS) untuk identifikasi dimer 4-vinilpiridin,
D(4-VP). Senyawa D(4-VP) diuji aktivitasnya sebagai inhibitor korosi terhadap
baja lunak dalam brine solution yang jenuh CO2 menggunakan metode wheel test.
Analisis morfologi permukaan baja lunak dilakukan menggunakan scanning
electron microscope (SEM). Senyawa D(4-VP) berwujud liquid berwarna kuning
transparan. Hasil KLT dan FTIR masing-masing menunjukkan adanya sedikit
perbedaan antara monomer dan produk dimerisasi berdasarkan identifikasi noda dan
gugus fungsi. Hasil screening LC?MS menunjukkan bahwa pembentukan senyawa
D(4-VP) teridentifikasi pada waktu retensi 6.18, 6.59, and 16.22 menit. Hasil
pengujian metode wheel test menunjukkan aktivitas inhibisi dari senyawa D(4-VP)
terhadap korosi, di mana efisiensi inhibisi (IE) meningkat dengan meningkatnya
konsentrasi D(4-VP) yang digunakan. Nilai IE terbesar (63.12%) telah dicapai pada
konsentrasi D(4-VP) tertinggi yang digunakan (200 mgL?1). Proteksi baja lunak
juga didukung dengan visualisasi permukaan menggunakan SEM.
Kata kunci: baja lunak, korosi CO2, inhibitor korosi, dimer 4-vinilpiridin,
kopling oksidatif.
%D 2023
%C UNIVERSITAS LAMPUNG
%R 1917011058
%I FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM
%L eprints72455