4 Operation
4-7
4.4 Sample pretreatment
Analytical samples need to be ground or polished before analysis. If samples are not
ground or polished properly, correct analysis results cannot be obtained.
The following shows the grinding/polishing methods according to the type of metals.
Steel, nickel, cobalt, titanium, and their alloyed metals
: Belt sander (grain size #60 to 80)
Cast iron : Belt sander (grain size #40)
Nonferrous metals
(aluminum, copper, zinc, lead, tin, magnesium, and their alloyed metals
: Lathe
Regularly clean the inside of the belt sander and the dust collector
filter, and also replace the filter. Dust accumulated in the dust collector
may become a fire hazard.
There is a high risk of fire when aluminum or magnesium samples
are used.
● Use the belt sander and turning tool of the lathe only for sample
pretreatment.
If they are used for polishing or grinding other materials, remaining
impurities may stick to samples, resulting in analytical value
fluctuations.
If they are used for polishing or grinding tools, remaining oils may
stick to samples, resulting in analytical value fluctuations.
● After polishing or grinding, store recalibration samples in a
desiccator or something similar in order to prevent oxidation of the
surface to be analyzed.
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