Insight into the covalent grafting of organic films onto carbon steel surfaces for protection

The novel use of p-nitrophenyldiazonium tetrafluoroborate salt (GG salt) as a protectant that is electrochemically grafted onto carbon steel has been investigated in 0.05 mol L⁻¹ H₂SO₄ and 5 wt% NaCl solutions using various corrosion monitoring techniques, such as electrochemical impedance spectrosc...

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Bibliographic Details
Published inChinese science bulletin Vol. 59; no. 10; pp. 971 - 980
Main Authors Huo, Sheng-Juan, Chen, Li-Hong, Chu, Chen-Sheng, Fang, Jian-Hui
Format Journal Article
LanguageEnglish
Published Heidelberg Springer-Verlag 01.04.2014
Science China Press
Subjects
activation energy
capacitance
Carbon
Carbon steels
Chemistry/Food Science
corrosion
Corrosion inhibitors
Corrosion prevention
Covalence
dielectric spectroscopy
Earth Sciences
Electrochemical impedance spectroscopy
electrochemistry
Engineering
Grafting
Humanities and Social Sciences
Inhibition
Life Sciences
monitoring
multidisciplinary
Physics
scanning electron microscopy
Science
Science (multidisciplinary)
sodium chloride
steel
temperature
Temperature effect
Carbon steel electrode
Aryl diazonium salt
Corrosion inhibition
Surface grafting
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Summary:The novel use of p-nitrophenyldiazonium tetrafluoroborate salt (GG salt) as a protectant that is electrochemically grafted onto carbon steel has been investigated in 0.05 mol L⁻¹ H₂SO₄ and 5 wt% NaCl solutions using various corrosion monitoring techniques, such as electrochemical impedance spectroscopy, potentiodynamic polarisation, infrared spectra and scanning electron microscopy measurements. The electrochemical study reveals that this compound is a mixed inhibitor that predominantly controls the cathodic reaction. The surface-grafted film decreases the double-layer capacitance and obviously increases the charge transfer resistance relative to a bare carbon electrode. The values of inhibition effect remain nearly unchanged with an increase in temperature range of 298–318 K. The aryl diazonium is covalently bonded on the steel surface, causing a slight decrease in the apparent activation energy. Overall, the surface-grafted films exhibit excellent inhibition performance in acid and saline solutions within the studied temperature range.
Bibliography:http://dx.doi.org/10.1007/s11434-014-0162-4
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ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-014-0162-4