The choice of different imaging detectors allows a high-resolution characterisation of the microstructure.
Detectors in the contrast types secondary electrons (SE) or backscatter electrons (BSE) can be used.
Special raster techniques allow panoramic images with low magnifications and high depth of field up to the highest resolution investigations of the microstructure in the nm range.
In addition, high-resolution overview images can be taken by means of "stage rasterisation", in which the sample stage moves automatically and combines many individual images into one image at the highest magnification.
Field emission cathode
A modern field emission cathode (Fe) is used for high-resolution scanning electron beam microscopy with a resolution in the sub-µm range, combined with reliable chemical and crystallographic electron beam microanalysis using EDX, WDX or EBSD.
Accelerating voltage Ua = 200 V - 30 kV
Beam current IB = 2 pA - 200 nA
Vacuum p = < 9x10-3 Pa
High-current mode
The field emission cathode can be operated in high current mode, reaching a beam current of the order of modern microprobes
High beam current of up to 200 nA.
This enables the combination of the advantages of a high-resolution SEM and a highly sensitive microprobe with low-noise and reliable electron beam microanalysis, while at the same time providing the high resolution and small beam diameters typical of the field emmision cathode.
Large sample chamber GM 340x320x310mm
High resolution scanning electron microscopy on smallest structures up to larger components, demonstrators or damage cases
Specifications: GAMRY Reference 600 Potentiostat with a Spectroelectrochemical UV-vis flow cell (SEC-2F) as well as a custom made IR cell. In addition the system is equipped with the DigiElch simulation software
Location: RUB, NC Group: AC4 Contact: Prof. Dr. Ulf-Peter Apfel Email: ac1[at]rub[dot]de
Specifications: Magritek Spinsolve 60 Benchtop NMR suitable for 1H, 31P and 19F NMR spectroscopy. The flow cell enables the connection with our electrochemical setups.
Location: RUB, NC Group: AC2 Contact: Prof. Dr. Ulf-Peter Apfel Email: ac1[at]rub[dot]de
Two three-electrode measuring cell: A - electrolyte: H_2 〖SO〗_4, B -electrolyte: 0.9% NaCl solution.
Working electrode: A - planar, max. Ø 10 mm, thickness max. 3 mm, B - embedded samples max. Ø 10 mm, thickness max. 8 mm; non-embedded samples do not have to have a specific geometry.
counter electrode: platinum sheet
reference electrode: calomel electrode (working voltage +244 mV)
potentiostat: A - VoltaLab PGP201, B - VoltaLab PGZ301
gas purging: air (oxygen), nitrogen
Application:
Investigation of the pitting corrosion behaviour of metallic materials
Investigation of the contact corrosion behaviour
Investigation of the impedance behaviour
Characterisation of the corrosion behaviour under body-like conditions
Characterisation of the capacitive behaviour of a coating
Electrolyte: almost freely selectable, for tribocorrosion investigations conductive electrolytes
load: 0.5-50 N
wear rate: 0.01-10 mm/s
Wear path for tribocorrosion: 2 mm
Application:
Characterisation of the sliding wear behaviour with media lubrication and dry running
Characterisation of the corrosion behaviour
Characterisation of the tribocorrosion behaviour, including wear-related corrosion and corrosion-related wear
Determination of the coefficient of friction with media lubrication and in dry operation
Subsequent investigation of the wear mechanisms and corrosion phenomena possible
