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Development of EPR technique for the control of cast alloys
Author(s) -
Cètre Y.,
Eichner P.
Publication year - 2001
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200101)52:1<20::aid-maco20>3.0.co;2-m
Subject(s) - electron paramagnetic resonance , metallurgy , materials science , austenitic stainless steel , alloy , nuclear chemistry , chemistry , corrosion , physics , nuclear magnetic resonance
The EPR DL (Electrochemical Potentiokinetic Reactivation Double Loop) technique enables the detection and quantification of de‐chromed areas in stainless steel materials. This dechromisation results in a local destruction of the passive film around the chrome carbides or the intermetallic chrome‐based phases (phases σ, χ …). The conjunction of a corrosive mixture and chrome‐depleted areas gives rise to an intergranular corrosion phenomenon (IC). This work sums up the design of testing conditions for the EPR test with a view to controlling in situ the structure of cast materials. We searched for a sensitive enough electrolyte, as well as for operational conditions leading to an easy application on site. The study was carried out with two alloys: – austenitic stainless steel CN‐7M – nickel based passivable alloy CW‐12MW and was accompanied with the development of a portable EPR cell for in‐situ testing.