Much higher sensitivity than competitive machines and at much lower cost. UNIQUE: Includes current scans,
A real-time colour plot is produced on the monitor screen during the scan. x & y are position and z is mV. Field and current scans in both vertical AND horizontal directions are also plottable.
The potential input signal obtained during the scan
is amplified and processed to produce data in 3 columns for loading into a (supplied) graphics programme. The data is also re-arranged in a matrix format suitable for immediate plotting in Excel. The result is a sophisticated and clear map
of the corrosion state of the surface, giving topographic detail which cannot be obtained by
conventional methods such as Tafel plots.
CorMap is ideal for investigation of coating failure, weld corrosion (unpainted), pitting, inhibitor efficiency, et
CorMap is an advance on the earler simple scanning reference electrode technique is referred to as SRET in the corrosion literature.
3-D plots show corroding defects which are not visible by optical microscope and long before they become visible.
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Scan over a pit in stainless steel:
Scanning electron microscope picture of a defect in a paint
Electrochemical microscope scan over the painted steel surface
shown on the left.
The scan area (10x10 mm) is larger than the SEM picture on the left and the paint defect is the tall peak .
Detects location and extent of pitting
- effect of temperature
- effect of inhibitors
Detects defects in paints
Detects effect of cathodic protection on paint integrity
Detects weld defects and heat affected zones
Tracks stress corrosion cracking
Detects corrosion of composites
Detects changes in water cut in oil/water mixtures
Monitors performance of ferrous and non-ferrous metals, homogeneous and heterogeneous alloys, composites with metallic phases, cermets.
The unit assesses unpainted alloy or painted metal performance in specific environments. When used with a potentiostat, the effect of cathodic protection on paint integrity can be assessed.
Suitable for research and for materials selection for the following industries:
Scratch in paint seen as high corrosion rate
These 5 pictures show :
(a) 3 pits in duplex stainless steel in FeCl3 + conc HCl
at 70 º C, then cooled to 45 º C.
(b) At 14 minutes, 35 º C.
(c) At 28 minutes, 29 º C.
(d) At 41 minutes, 29 º C., showing repassivation.
(e) At 54 minutes, 29 º C., more repassivation.
A scan across a weld bead on stainless steel.The CorMap scanner can scan over the raised weld bead.
Grinding flat is not required for CorMap but is required for other instruments such as SVET
Surface profile of a paint blister showing it raised above surface