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LECO is a registered trademark of LECO CorporationForm No. 203-821-033 8/07-REV5 © 2007 LECO Corporation
Spectroscopy Application NoteSpectroscopy Application Note
Depth Profile Analysis for Surface Product Quality Control
Glow discharge spectroscopy (GDS), as an atomic emission technique, is used for both bulk and quantitative depth profiling analyses. GDS allows sampling of the surface a few nanometers at a time; therefore, the correlation between a material’s chemistry and depth becomes readily apparent. Simultaneousdata on multiple elements, in different matrices, is provided in an easy-to
®use Windows -based environment. The layer-by-layer removal of sample material allows for the quantification of results in many sample types, both homogenous and non-homogenous. The versatility of GDS allows both routine and non-routine applications, making GDS a practical tool for production control and problem solving applications.
Conductive Materials
Nonconductive Materials
(a) Electroplated steels - coating thickness, coating weight and compositional uniformity(b) Decarburization - profiling of unprepared surface to determine carbon concentration vs depth(c) Nitrocarburized steels - thickness and composition of heat treated zone(d) PVD coatings (TiN, TiCN, CrN, etc.) - thickness, composition and residual oxide/carbon contamination(e) Steel in process (i.e. Zn phosphate) - thickness and composition(f) Semiconductors - profile material layers and composition
(a) Thermal barrier coatings - coating thickness and composition(b) Polymer coatings - profile coating to ensure metal is not diffusing through polymer(c) Glass - distribution of diffused elements(d) Paint on steel - profile coating
100
10
1
20 4 6 8 10 12 140.1
Depth, µm
Var
iati
on
in C
on
cen
trat
ion
Nitrocarburized Steel
Carbon
Iron
Nitrogen
nc
i
t C
nti
h
etr
nn
eg
%o
ao
iW
Depth in µm
Zn
Interface at 1.0 µm
Interface at 8.4 µm
FePbC
Mn
Al
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.00.0 1.1 2.3 3.5 4.7 5.9 7.1 8.2 9.4 10.6 11.8
Zin
c o
n S
teel
Fe = 100.0 x Wt%Zn = 100.0 x Wt%C = 001.0 x Wt%Al = 000.1 x Wt%Mn= 001.0 x Wt%Pb = 010.0 x Wt%
SCALE:
Variation of carbon and nitrogen concentration vs depth in a nitrocarburized steel surface.
Quantitative plot shows depth and concentrationsfor coated materials.
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