Abstract: Extract of pepaya
(Carica papaya) leaves as
corrosion inhibitor for steel St. 37 in sulphuric acid is investigated. The
methods employed for study were the weight loss method, potentiodynamic
polarization and photooptic analysis. The weight loss determination showed that
the corrosion rate decreased by additionof
extract of Carica papaya leaves. The inhibition efficiency was found to
increase with increasing temperature. Maximum inhibition efficiency (96,22%) is
reached 1,5 N sulphuric acid by addition of NaCl 0,2 N and concentration of
extract 1,5%. Potentiodynamic polarization curve indicated that Carica papaya
leaves extract behave as the mixed type inhibitor. The activation energy (Ea)
increase with addition of concentration Carica papaya leaves extract that is
76,646 kJ/mol to 120,608 kJ/mol. Fotooptic analysis showed that morphology of
specimentsurface in solution without inhibitor and Carica papaya leaves extract
1,5% was different.
Keywords: corrosion,
inhibition efficiency, Carica papaya, potensiodynamic polarization, H2SO4
Penulis: Yulia Risandi,
Emriadi, dan Yeni Stiadi
Kode Jurnal: jpkimiadd120007
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