A rapid and facile method for measuring corrosion rates using dynamic light scattering

A dynamic light scattering (DLS) method was adopted for measuring the corrosion of iron nanoparticles. The average diameter of the nanoparticles in a sodium chloride suspension increased linearly with time as iron oxide layers formed around the nanoparticles. The nanoparticle corrosion rate determin...

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Bibliographic Details
Published in:Analyst (London) 2012-02, Vol.137 (3), p.584-587
Main Authors: Joo, Jinmyoung, Seo, Hyejung, Chun, Changho, Han, Kunwoo, Jung, Hwangyo, Kim, Sungjee, Jeon, Sangmin
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Corrosion
Corrosion rate
Corrosion tests
Dynamics
Exact sciences and technology
Iron oxides
Light scattering
Nanoparticles
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Summary:A dynamic light scattering (DLS) method was adopted for measuring the corrosion of iron nanoparticles. The average diameter of the nanoparticles in a sodium chloride suspension increased linearly with time as iron oxide layers formed around the nanoparticles. The nanoparticle corrosion rate determined by DLS was found to be almost identical to the value obtained by conventional immersion tests (ASTM G31). The DLS method offers the advantage that measurements may be completed within several hours under natural corrosion conditions whereas the conventional immersion method requires several months. Application of the DLS method to alloy nanoparticles with a variety of chromium compositions showed that the nanoparticle sizes changed nonlinearly over time, and the curves were best fit by a first order exponential function. The first order time constants were found to be linearly related to the corrosion rates determined by ASTM G31.
ISSN:0003-2654
1364-5528
DOI:10.1039/c2an15975a