title: A rapid and facile method for measuring corrosion rates using dynamic light scattering.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea.
authors.forename: Jinmyoung
authors.initials: J
authors.lastname: Joo
authors.forename: Hyejung
authors.initials: H
authors.lastname: Seo
authors.forename: Changho
authors.initials: C
authors.lastname: Chun
authors.forename: Kunwoo
authors.initials: K
authors.lastname: Han
authors.forename: Hwangyo
authors.initials: H
authors.lastname: Jung
authors.forename: Sungjee
authors.initials: S
authors.lastname: Kim
authors.forename: Sangmin
authors.initials: S
authors.lastname: Jeon