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2 cases · 11 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: S21800 Capture method: Scanning Electron Microscope clear all

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Nitronic 60 cylinder. Scanning electron microscopy image of a corroded region at the external surface of the cylinder, that is austenitic. The image shows the localized corroded regions in form of pits.
1228
VIEW
ML00121 / Feb.2018
Pitting Corrosion in a Subsea System
M - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
Scanning electron microscopy image of the external surface of the line at the cracking position showing multiple cracks, branched, transverse to the line axis.
79
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface

More from these cases

ML00121 — Pitting Corrosion in a Subsea SystemM - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Nitronic 60 cylinder. Scanning electron microscopy image of a corroded region at the external surface of the cylinder, that is austenitic. The image shows the structure revealed by dissolution of the material (inside the pits) evidencing the strain hardened layer that is presented at the cylinder surface due to the manufacturing process.
106
VIEW
ML00121 / Feb.2018
Pitting Corrosion in a Subsea System
M - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
Nitronic 60 cylinder. Scanning electron microscopy image detail of a corroded region inside a pitting showing the etched structure (strain hardened austenitic structure).
103
VIEW
ML00121 / Feb.2018
Pitting Corrosion in a Subsea System
M - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
Nitronic 60 cylinder. Scanning electron microscopy image of a corroded region in a pit, at the external surface of the cylinder. The corrosion (dissolution) revealed the strain hardened layer at the surface.
96
VIEW
ML00121 / Feb.2018
Pitting Corrosion in a Subsea System
M - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
17-4 PH rod. Surface aspect by scanning electron microscopy showing a region where the passivation layer was destroyed and a pitting was in the begining.
86
VIEW
ML00121 / Feb.2018
Pitting Corrosion in a Subsea System
M - Austenitic / MartensiticP - Rod & CylinderAp - SubseaCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Pitting
ML00095 — MIC of a Riser Control LineM - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Detail, by scanning electron microscopy, of the external surface of the line at the cracking position presenting branched cracks, transverse to the line axis. The surface of the fitting is fully stained (dark grey), from where the cracks start, indicating that the material loose passivation in these regions.
62
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Branched Cracks
The aspect of the fitting surface by SEM shows multiple cracks. Interesting to observe a stained region (dark grey) that corresponds to regions where the material passivation was destroyed.
43
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface
Detail of one region that had the passivation layer destroyed .
45
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface
Detail of one region that had the passivation layer destroyed and presented corrosion cracks.
48
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Corrosion Cracking
The aspect of the external surface of the fitting shows regions where the passivation was lost and where microcracks started already.
54
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Microcracks