Pitting

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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Martensite Capture method: Replication Technique clear all

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The micrographic aspect of the corroded surface, after polishing and etching with Kalling, shows the margin of one pit and microcracks propagating through previous austenite grain boundaries of the martensitic structure, probably associated to the biological attack and material embrittlement. Replication technique.
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ML00092 / Sep.2017
MIC of a Valve Body
M - Martensitic Stainless SteelP - Valve BodyAp - Oil and GasCd - Brittle Behavior
Cm - Kalling etched, OMDf - Pitting