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L-Tryptophan as green corrosion inhibitor for low carbon steel in hydrochloric acid solution

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Abstract
The inhibition behavior of low carbon steel in 1 M HCl by L-tryptophan was investigated with weight loss
experiment and Tafel polarization curve in the used temperature range (298–328 K). All the experimental results show that L-tryptophan has excellent corrosion inhibition performance and the most effective concentration of inhibitor is 1 x 10-2 mol L-1. The Tafel polarization curve results indicate that L-tryptophan acts more as a cathodic than anodic inhibitor. The adsorption of L-tryptophan on the surface of low carbon steel obeys the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The adsorption behavior of L-tryptophan at Fe surface (1 1 0) was also investigated by the molecule dynamics simulation method and density functional theory. The results indicated that the
L-tryptophan could adsorb firmly on the Fe surface through the indole ring with p-electrons and nitrogen/oxygen atom with lone-pair electrons in its molecule.

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Informasi Detail

Judul Seri

Journal of Materials Science

No. Panggil

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Penerbit

New York : Springer Science Business Media., 2010

Deskripsi Fisik

J Mater Sci (2010) 45:979–986

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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