Damage

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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Coating Layer Capture method: Optical Microscope Detail focus: Sampling and Analysis clear all

Damage — sub-branches

Corrosion 1Ductile Behavior 1Hydrogen 2

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As polished micrographic aspect of the longitudinal section of the cylinder, at the surface, in a region where the damage is in the begining. It is possible to see that there are two layers at the surface. A first Ni layer, 300HV average hardness, over the low carbon steel substrate, 200HV average hardness, and a chromium plated layer, 1100HV average hardness and several discontinuities.
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ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Micrography by OMDf - Longitudinal Section