**5. Summary**

The following conclusions were drawn based on the experiments carried out in an author's stream and flow device generating a cavitation environment in continuous operation in a closed cycle for 500 PMHs and based on the examinations of cavitation generators with and without a protective coating:

**1.** The highest mass loss of 0.1752 g was seen for a cavitation generator made of ferriticpearlitic P265GH steel, wet sanded with sandpaper with the grain size of 1000, where the biggest cavitation wear effects were also noticed, confirmed with photographs from an electron scanning microscope.


500 PMHs were fatigue processes caused by long-term interaction of the cavitation environment, the result of which was the plastic waving of the substrate material (white arrow) made of X2CrNi18-9 steel, which also led to its significant destruction, cracking of the WC/C coating

**Figure 21.** Result of cavitation wear of the surface of a constructional element made of X2CrNi18-9 steel with a WC/C coating deposited by PVD after operation in a stream and flow device (**Figure 2a**) for 500 PMHs: (a) magnification of

**Figure 20.** Result of cavitation wear of the surface of a constructional element made of X2CrNi18-9 steel with a WC/C coating deposited by PVD after operation in a stream and flow device (**Figure 2a**) for 500 PMHs: (a) magnification of

The following conclusions were drawn based on the experiments carried out in an author's stream and flow device generating a cavitation environment in continuous operation in a closed cycle for 500 PMHs and based on the examinations of cavitation generators with and

**1.** The highest mass loss of 0.1752 g was seen for a cavitation generator made of ferriticpearlitic P265GH steel, wet sanded with sandpaper with the grain size of 1000, where the

and consequently to its detachment from the substrate (**Figure 21b**).

**5. Summary**

without a protective coating:

2500× and (b) magnification of 7500×.

250× and (b) magnification of 2500×.

24 Cavitation - Selected Issues

