348 Prakt. Met. Sonderband 38 (2006) 
2. EXPERIMENTAL PROCEDURE Th 
Aft 
The leaky heat exchanger (Fig. 1) was cut in several directions with a hacksaw. By optical To 
inspection only minimal corrosion in the region of the water side is observed (Fig. 2). The etc 
oil side shows a copper coloured surface and at the water side the surface is brown with - 
minimal green corrosion dots. Using a sectioning machine samples were taken from 
several regions for metallographic preparation (Fig. 3). 
Fol 
The 
ele 
3. 
3.1 
The 
Fig. 1: Plate heat exchanger she 
Th 
(h} oil oir water vr The 
inv 
gre 
oil out 
water in 
1: 
Fig. 2: Part from the plate heat exchanger (oil and water side; Fic 
Green corroded dots are visible in (a) 
3.2 
At 
the 
cof 
gre 
bot 
the 
an 
wit 
Fig. 3: Plate heat exchanger and marks for the sampling at the water side a 
or