Published on February 21, 2014
Detecting Corrosion in Aluminum With Eddy Current Array Technology Application Note
The Challenge • Detect and assess the extent of corrosion damage on far side of an aluminum surface without having direct access to region of interest. • In this particular case: • • Slightly concave floor • Thickness 6.35–7.94 mm (0.250–0.313 in.) • Diameter approximately 5.2 m (17 ft) • Far side of floor inaccessible • 2 Aluminum tank floor Looking to characterize pitting and thinning © Eddyfi 2014
The Challenge Before using the Eddyfi solution, examination performed with UT: • Requires couplant • Crew of 4–5 technicians • Time consuming because of the small active surface of the transducer (6.35 mm or 0.25 in.) Alternate ECA solution must: • • Adapt to the tank floor’s curvature and other geometric features • Offer sufficient penetration to scan through floor surface • 3 Offer a wide coverage Be robust enough to withstand extensive use © Eddyfi 2014
The Solution Using eddy current array (ECA) technology with a semiflexible probe to scan through aluminum, detect corrosion defects and characterize them. Three-part solution: • • Ectane™ test instrument • 4 Semi-flexible ECA surface probe Magnifi ® acquisition and analysis software © Eddyfi 2014
The Solution — Ectane Eddyfi’s workhorse testing instrument. • Can be configured for almost any type of inspection technique, including ECT and ECA • • Compact, portable, and rugged • 5 Battery operated — autonomy 8 hours (typical) Up to 256 channels © Eddyfi 2014
The Solution — Semi-Flex Probe Leverages ECA technology to accurately detect and characterize corrosion on the far side of an aluminum tank floor. • Multiplexed coils • Coils working in transmitter-receiver mode • Easy-to-use phase angle to assess extent of corrosion and discriminate between nearsurface and more distant defects • • 128 mm (5.04 in.) semi-flexible active surface • 6 No need for couplant 0.6–20 kHz range with 5 kHz central frequency. © Eddyfi 2014
The Solution — Semi-Flex Probe A calibration plate was used to validate the probe’s performance. To simulate both localized pitting and plain corrosion: • • 7 Flat-bottom holes (FBH) 1.59–12.7 mm (0.063–0.500 in.) in diameter 10 % to 80 % of the plate’s thickness © Eddyfi 2014
The Solution — Magnifi Eddyfi’s cutting-edge acquisition and analysis software for graphical display (C-scan), record keeping, and reporting. Magnifi produces 2D and 3D C-scans, which are extremely useful when interpreting signals. 8 © Eddyfi 2014
The Results • The probe can clearly detect: • Pitting-like indications down to the 1.59 mm (0.063 in.) FBH at 40 % thickness • Thinning-like indications down to the 12.7 mm (0.5 in.) FBH at 10 % thickness • The solution was deployed on site and led to the discovery of very degraded tank floor plates. • The entire ECA inspection of a typical tank floor was performed in about one tenth the time taken with the original UT inspection procedure, and was carried out by a single technician. 9 © Eddyfi 2014
The Benefits • Rapid scanning of large regions of interest • Improved versatility, adapting to curved or irregular surfaces • High-precision assessment of localized indications (e.g., pitting) and general degradation (e.g., thinning) • Easier interpretation with C-scan imaging • Full data recording and archiving capabilities 10 © Eddyfi 2014
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Title: Detecting Corrosion in Aluminum with Eddy Current Array Technology Author: Eddyfi Created Date: 2/22/2016 2:20:12 PM
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