Effects Of Gambir Extract Treatment On The Rusted Mild Steel
Uncaria gambir was extracted using six different solvents and the effects on the extraction yield and phenolic contents were investigated. The phenolic contents, namely, total phenolic (TPC), total flavonoid (TFC), condensed tannin (CTC) and antioxidant activity (AA) of the gambir extracts wer...
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my-usm-ep.451762019-08-02T08:42:06Z Effects Of Gambir Extract Treatment On The Rusted Mild Steel 2013-07 Dahon, Nur Hazwani QD1-999 Chemistry Uncaria gambir was extracted using six different solvents and the effects on the extraction yield and phenolic contents were investigated. The phenolic contents, namely, total phenolic (TPC), total flavonoid (TFC), condensed tannin (CTC) and antioxidant activity (AA) of the gambir extracts were quantified. Ethyl acetate solvent was found successfully extracted the highest TPC (93% catechin equivalent), TFC (91% catechin equivalent) and CTC (96% weight). Besides, the phenolic content shows the ability of gambir extract as antioxidant. The performance of gambir extract as rust converter was evaluated. The effects of gambir concentration, pH solution, contact time and the addition of phosphoric acid in rust converter were studied. The FTIR spectra showed that the conversion of lepidocrocite (γ-FeOOH) was the fastest, followed by magnetite (Fe3O4) and goethite (α-FeOOH) was the slowest. The effectiveness of rust conversion coatings was studied via EIS and potentiodynamic polarization. The Tafel and Nyquist plots analyses were in agreement showing that increasing the gambir concentration decreased the corrosion rate and the mixture of 10% gambir and 5% H3PO4 produced a better rust converter. The changes in morphology of the rust were significant as viewed by SEM analysis. The spike-shaped rust was converted into a more homogeneous and compact surface after treatment with rust converter. XRD patterns showed a decrease of the rust products after being treated with gambir-based rust converter. 2013-07 Thesis http://eprints.usm.my/45176/ http://eprints.usm.my/45176/1/Nur%20Hazwani%20Binti%20Dahon24.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Kimia |
| institution |
Universiti Sains Malaysia |
| collection |
USM Institutional Repository |
| language |
English |
| topic |
QD1-999 Chemistry |
| spellingShingle |
QD1-999 Chemistry Dahon, Nur Hazwani Effects Of Gambir Extract Treatment On The Rusted Mild Steel |
| description |
Uncaria gambir was extracted using six different solvents and the effects on the
extraction yield and phenolic contents were investigated. The phenolic contents,
namely, total phenolic (TPC), total flavonoid (TFC), condensed tannin (CTC) and
antioxidant activity (AA) of the gambir extracts were quantified. Ethyl acetate
solvent was found successfully extracted the highest TPC (93% catechin equivalent),
TFC (91% catechin equivalent) and CTC (96% weight). Besides, the phenolic
content shows the ability of gambir extract as antioxidant. The performance of
gambir extract as rust converter was evaluated. The effects of gambir concentration,
pH solution, contact time and the addition of phosphoric acid in rust converter were
studied. The FTIR spectra showed that the conversion of lepidocrocite (γ-FeOOH)
was the fastest, followed by magnetite (Fe3O4) and goethite (α-FeOOH) was the
slowest. The effectiveness of rust conversion coatings was studied via EIS and
potentiodynamic polarization. The Tafel and Nyquist plots analyses were in
agreement showing that increasing the gambir concentration decreased the corrosion
rate and the mixture of 10% gambir and 5% H3PO4 produced a better rust converter.
The changes in morphology of the rust were significant as viewed by SEM analysis.
The spike-shaped rust was converted into a more homogeneous and compact surface
after treatment with rust converter. XRD patterns showed a decrease of the rust
products after being treated with gambir-based rust converter. |
| format |
Thesis |
| qualification_level |
Master's degree |
| author |
Dahon, Nur Hazwani |
| author_facet |
Dahon, Nur Hazwani |
| author_sort |
Dahon, Nur Hazwani |
| title |
Effects Of Gambir Extract Treatment On The
Rusted Mild Steel |
| title_short |
Effects Of Gambir Extract Treatment On The
Rusted Mild Steel |
| title_full |
Effects Of Gambir Extract Treatment On The
Rusted Mild Steel |
| title_fullStr |
Effects Of Gambir Extract Treatment On The
Rusted Mild Steel |
| title_full_unstemmed |
Effects Of Gambir Extract Treatment On The
Rusted Mild Steel |
| title_sort |
effects of gambir extract treatment on the
rusted mild steel |
| granting_institution |
Universiti Sains Malaysia |
| granting_department |
Pusat Pengajian Sains Kimia |
| publishDate |
2013 |
| url |
http://eprints.usm.my/45176/1/Nur%20Hazwani%20Binti%20Dahon24.pdf |
| _version_ |
1747821462711959552 |