| US 7,483,152 B2 | ||
| High resolution statistical analysis of localized corrosion by direct measurement | ||
| Vladimir Jovancicevic, Richmond, Tex. (US); and Samuel Everett Campbell, Richmond, Tex. (US) | ||
| Assigned to Baker Hughes Incorporated, Houston, Tex. (US) | ||
| Filed on Feb. 23, 2005, as Appl. No. 11/63,363. | ||
| Claims priority of provisional application 60/549826, filed on Mar. 03, 2004. | ||
| Prior Publication US 2005/0213430 A1, Sep. 29, 2005 | ||
| Int. Cl. G01B 11/14 (2006.01) | ||
| U.S. Cl. 356—614 | 17 Claims |
| 1. A method of measuring and analyzing localized corrosion of a substrate comprising:
locating a substrate in an orientation in a measuring apparatus;
taking height and spatial measurements of an initial surface area of the substrate within a height and spatial resolution
to produce an initial digital surface map;
subjecting the substrate to a corrosive environment for a time period;
locating the substrate in the measuring apparatus in the same orientation;
taking height and spatial measurements of the same surface area of the substrate within the height and spatial resolution
to produce a subsequent digital surface map;
subtracting the subsequent digital surface map from the initial digital surface map to give a measurement of extent of localized
corrosion of the surface area; and
statistically analyzing the measurement of extent of localized corrosion to determine a characteristic selected from the group
consisting of corrosion depth (penetration) rate, spatial pit distribution, average pitting rate, maximum pitting rate, and
combinations thereof, in the absence of laser profilometry.
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