Ni layer

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Crevice Corrosion in a Subsea System — Aspect Before Analysis

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Micrography of the longitudinal section of the cylinder , at the surface, where it was not yet damaged. The steel substrate is in the bottom of the figure, the Ni layer is in the center and the Cr layer is in the top of the figure.
38
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Nital Etched Micrography by OMDf - Ni layer

More from these cases

ML00128 — MIC of a Stored Hydraulic CylinderM - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Micrography of the interface between the steel substrate and the first Ni layer. The Ni layer, 160 microns thick and 300HV hardness, is uniform and presents no discontinuities.
37
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Nital Etched Micrography by OMDf - Ni layer