Alpha & Beta

1 case · 4 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Condition: Preferential Dissolution Capture method: FeCl3+HCl+Ethanol Etched Micro Detail focus: Dezincification clear all

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Same region of the previous figure, after etching. Micrography presenting the interface between the layer where the dezincification occurred (top of the figure) and the region where the material was not yet corroded (bottom of the figure, now etched to reveal the microstructure).
85
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ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - FeCl3+HCl+Etanol Etched MicroDf - Dezincification

More from these cases

ML00125 — Dezincification of a Cooler TubesheetM - BrassP - PlateAp - ShipCd - Preferential Dissolution
Micrography of the interface between the layer where the dezincification occurred (top of the figure) and the region where the material was not yet corroded (bottom of the figure, etched to reveal the microstructure).It is clear that the cracks (black opened regions in the upper side of the figure) are associated to the red islands that correspond to the regions of beta phase (orange islands in the bottom of the figure),
103
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - FeCl3+HCl+Etanol Etched MicroDf - Dezincification
Micrography of the corroded region of the tubesheet presenting a microstructure of alpha (light yellow ), but no longer beta. In the position of the beta phase it is possible to see the cooper rich island (light red) and cracks (black) due to the selective removal of the zinc.
75
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - FeCl3+HCl+Etanol Etched MicroDf - Dezincification
Micrographic detail of the corroded region of the tubesheet presenting a microstructure of alpha (light yellow ), but no longer beta. In the position of the beta phase it is possible to see the cooper rich island (light red) and cracks (black) due to the selective removal of the zinc.
80
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - FeCl3+HCl+Etanol Etched MicroDf - Dezincification