374 Prakt. Met. Sonderband 46 (2014)
facilities, plants, transport systems etc., high emphasize has to be placed on risk
avoidance which is based on the understanding of corrosive mechanics.
Fig. 1: Corroded surfaces are characterized by steep flanks Conve
and varying reflection properties
mean
repre:
depth
3. FOCUS-VARIATION FOR OPTICAL 3D MEASUREMENT IN THE MICRO surfac
AND NANO RANGE with re
The optical InfiniteFocus system based on the principle of Focus-Variation meets all
requirements for corrosion analysis. Measurements reach a vertical resolution of up to 4. TH
10nm even at steep flanks and strongly varying reflection properties. Additionally, the
entire surface topographic information is captured in combination with its registered color The c
information. Both, the topographic and color information are reaistered to the 3D data file. depth
inform
inforrr
Using
reach
high \
Additi
Fig. 2: Topographic and color information
are registered to a 3D data file
The high resolution 3D system is often used to analyze mechanically influenced corrosion,
e.g. stress corrosion cracking, corrosion fatigue cracking or erosion corrosion. Pitting
corrosion, crevice corrosion and selective corrosion are further fields of interest. Metallic
components such as stainless steels, nickel-base alloys, titanium or aluminium alloys are
easily measured. Due to the surface analysis, corrosive mechanics and attacks can be
better understood. In terms of measuring degradation coming along with e.g. erosion
corrosion, profile analysis to measure depth and area analysis to show the deepest void
are the most distinctive characteristics.