Copper Alloy

3 cases · 9 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Surface Aspect by SEM clear all

Copper Alloy — sub-branches

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

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Scanning electron microscopy of the internal surface of the tube, showing that under the deposits there are regions of localized corrosion.
30
VIEW
ML00170 / Sep.2020
MIC in Aluminum Brass Tubes
M - Aluminum BrassP - Seamless tubeAp - MaritimeCd - Preferential Dissolution
Cm - Surface Aspect by SEMDf - Internal Surface
Aspect of the coaster surface grooves, by scanning electron microscopy in a low magnification, showing in the right side the flat region that serves as a support; and in the left side the decorative grooves. The smooth surface in the groove suggests that the coasters were manufactured by casting.
66
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
Aspect of the surface of the platesheet at a corroded area, showing the selective attack effect.
99
VIEW
ML00125 / Mar.2018
Dezincification of a Cooler Tubesheet
M - BrassP - PlateAp - ShipCd - Preferential Dissolution
Cm - Surface Aspect by SEMDf - Corrosion

More from these cases

ML00170 — MIC in Aluminum Brass TubesM - Aluminum BrassP - Seamless tubeAp - MaritimeCd - Preferential Dissolution
Microscopic detail, by scanning electron microscope, of a region where there is a localized dissolution at the internal surface of the tube. The deposits are adhered at the surface and under the deposits, the analysis indicated increased sulfur levels, suggesting SRB (sulfate reduced bacteria) effects.
31
VIEW
ML00170 / Sep.2020
MIC in Aluminum Brass Tubes
M - Aluminum BrassP - Seamless tubeAp - MaritimeCd - Preferential Dissolution
Cm - Surface Aspect by SEMDf - Pitting
Scanning electron microscopy aspect of the region inside of a pit. The aspect is of a chemical attack, generated by the metabolic by-products of the adhered microorganism. The effect is of a localized dissolution and the granular tube microsctruture is revealed.
40
VIEW
ML00170 / Sep.2020
MIC in Aluminum Brass Tubes
M - Aluminum BrassP - Seamless tubeAp - MaritimeCd - Preferential Dissolution
Cm - Surface Aspect by SEMDf - Corrosion
ML00156 — Antique Silver Plated Decorative PieceM - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Detail of the previous photo showing the flat surface in the right side and the grooves in the left side. The flat side is scratched and the grooves presented a smooth finishing (with dendritic morphology).
57
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
Detail of the flat scratched region of the coaster surface. The dark grey "nodules" are lead (Pb) base inclusions.
50
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
Detail of the groove region, showing a typical casting morphology at the surface: smooth and presenting a dendritic aspect with interdendritic shrinkage. Some dark grey "nodules" with Pb inclusions are also observed.
51
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
There are some regions in the coaster surface where pores associated to shrinkage is evident.
49
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - Casting defects