Copper Alloy

1 case · 7 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Detail focus: Dezincification clear all

Copper Alloy — sub-branches

Aluminum Brass 1Aluminum Bronze 2Brass 3Cupronickel 1Pure Copper 1Tin Bronze 1

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Macrographic detail of the transverse section of the tubesheet at the cooper alloy tube position, after removal of the 5/8" tube. The "layer" at the top of the plate (exposed to the cooling medium - treated seawater) is a region of selective corrosion, dezincification. It is possible to see that in the right side of the figure, where the cooper tube was positioned, the corrosion damage is deeper.
153
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - Transverse Section AspectDf - Dezincification

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ML00125 — Dezincification of a Cooler TubesheetM - BrassP - PlateAp - ShipCd - Preferential Dissolution
Micrographic detail of the dezincification effect, where the beta phase is preferentially corroded, leaving a cooper rich phase (red) that is porous and easily cracks.
121
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - As polished micrographyDf - Dezincification
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).
86
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - As polished micrographyDf - Dezincification
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
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 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

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