Modified cassava starches as potential corrosion inhibitors for sustainable development
AUTOR(ES)
Ochoa, Nathalie, Bello, Marisela, Sancristóbal, Janet, Balsamo, Vittoria, Albornoz, Alberto, Brito, Joaquin L.
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
02/08/2013
RESUMO
Activated (AS) and carboxymethylated (CMS0.24) cassava starch derivatives were studied as corrosion inhibitors for carbon steel XC35 in a 200 mgL-1 NaCl solution. They were characterized by back titration and Fourier Transform Infrared Spectroscopy (FTIR). Electrochemical techniques were used to evaluate the inhibitive properties of starches at room temperature and the chemical composition of the protective films was determined by X-Ray Photoelectron Spectroscopy (XPS). Electrochemical measurements revealed that AS acts as mixed inhibitor, whereas CMS0.24 mainly inhibits the anodic reaction. In both cases, the protection increased with the inhibitor concentration; nevertheless, after 24 hours of immersion, the CMS0.24 loses its properties, while AS molecules still maintains them. XPS analyses show that the inhibitive films are composed of an iron oxide/hydroxide mixture in which starch molecules are incorporated. Results were explained taking into consideration the hydrophilicity and the strength of the ionic interaction of the starches with the metal surface.
Documentos Relacionados
- An Innovative Vessel for Research Studies at Amazon as a Potential Support for Sustainable Development and Conservation of the Region
- Roasted Coffee Extracts as Corrosion Inhibitors for Mild Steel in HCL Solution
- Chemistry for Sustainable Development
- Histone deacetylase inhibitors as potential treatment for spinal muscular atrophy
- Eletrólitos poliméricos a partir de amidos de mandioca modificados (catiônico, eterificado e oxidado)