This ONR-supported program has concentrated on the cavitation-erosion behavior of thermal-sprayed coatings on steel in distilled and in salt water. The coatings have been Zn, Al and Zn-150 w/o Al. Porosity is a major cause of failure in a cavitation field, and further work is proposed whereby the porosity can be controlled and the coatings examined both from the points of view of corrosion (visually and electrochemically) and cavitation-erosion (visually and with weight-change measurements). The microstructures of both oxide and metal coatings have been examined through x-ray diffraction and using scanning and transmission electron microscopy techniques. Aside from active coatings, it is also desired to examine thermally-sprayed stainless steels, exothermic coatings and sprayed metallic glass forming materials. Acoustic emission (AE) is being developed as an important tool for coating evaluation. It is one goal to relate AE measurements to cavitation-corrosion survivability. (DePo)
The response of coated steels to cavitation in corrosive environments
Die Reaktion beschichter Staehle auf Kavitationserosion in einer aggressiven Umwelt
US Government Reports ; Mar ; 1-64
1979
64 Seiten
Report
Englisch
STAHL , METALLE , BESCHICHTUNG (UEBERZUG) , SPRITZSCHICHT , KORROSIONSINHIBITOR , EROSION , KAVITATION , OBERFLAECHENSCHUTZ , ZINK , MEERWASSER , OXID , POROSITAET
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