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Effect of graphite shape on the Corrosion of Grey Cast Iron in phosphoric acid
Author(s) -
Lunarska E.
Publication year - 1996
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/maco.19960471002
Subject(s) - materials science , graphite , cast iron , pearlite , metallurgy , eutectic system , corrosion , cathodic protection , ferrite (magnet) , phosphoric acid , hydrogen , austenite , metal , electrochemistry , composite material , microstructure , chemistry , organic chemistry , electrode
Grey cast iron (3.4%C–2.7%Si–0.4%Mn–0.5% P–0.008%S) with different morphology of graphite and different amount of ferrite, pearlite and eutectic phases has been subjected to corrosion and electrochemical tests in phosphoric acid solution, simulating the oxidized engine oil. The difference in the cathodic process and corrosion of studied materials has been mainly attributed to the variation of ferrite and pearlite volume fraction and to the presence of eutectic phases in the matrix of metals with different graphite shape. The possible assistance of the additions of Ce and Sn modificators on electrochemical behavior of cast iron has been discussed. Corrosion process accompanied by the hydrogen evolution leads to the formation of hydrogen induced cracks at the sharp edges of the graphite particles. In vermicular cast iron, hydrogen cracks form the spatial network causing the falling off some parts of metal and thus accelerating the degradation of this material under the corrosion‐erosion conditions.