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Combination of Electrochemical Noise and Acoustic Emission for Analysis of the Pitting Corrosion Behavior of an Austenitic Stainless Cast Steel
Author(s) -
Kietov Volodymyr,
Mandel Marcel,
Krüger Lutz
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800682
Subject(s) - electrochemical noise , materials science , acoustic emission , pitting corrosion , corrosion , metallurgy , alloy , austenite , electrochemistry , alloy steel , noise (video) , oxide , bubble , electrode , composite material , microstructure , chemistry , image (mathematics) , artificial intelligence , parallel computing , computer science
The pitting corrosion behavior of a high alloy cast steel is analyzed in a sodium chloride solution by combination of the electrochemical noise technique and the acoustic emission (AE) method. Four corrosion states are identified on the steel surface after the 70 h noise measurement test. The simultaneously monitored AE exhibits two types of acoustic signals. The first type of AE events is attributed to the local passive oxide breakdown and the pit initiation process and the second type of AE events is related to the subsequent associated hydrogen gas bubble evolution.