Device for in situ monitoring of corrosion rates of...

Details Device for in situ monitoring of corrosion rates of... Device for in situ monitoring of corrosion rates of...

G - Physics

01

N

204/115, 324/23

G01N 17/00 (2006.01) G01N 17/02 (2006.01)

Patent

CA 1293770

ABSTRACT OF THE DISCLOSURE A technique for electrochemical measurement of the corro- sion current (corrosion rate) is disclosed. The electro- chemical parameters that are necessary to calculate the corrosion rate are contained in the harmonic current, response to a moderate amplitude sinusoidal voltage per- turbation applied to the corroding metallic component. The harmonic current response is analyzed at frequencies 1f, 2f, 3f, 4f, 5f and the rectification current response at DC current to the presence of a 20-50 mV AC voltage perturbation at a frequency f. The free corrosion cur- rent density, the free corrosion potential and the Tafel coefficients are calculated. The Tafel coefficient or Tafel slope is a measure of the exponential dependence at the rate of corrosion in a material. From these data, the dissolution current is calculated, which in turn is integrated with respect to time to yield a cumulative mass loss. A-45695

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