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Stress corrosion cracking investigation of high Co‐Ni secondary hardening ultra‐high strength steel in neutral 3.5 wt% NaCl solution
Author(s) -
Guo Q.,
Liu J.H.,
Yu M.,
Li S.M.
Publication year - 2015
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.201408091
Subject(s) - materials science , passivation , stress corrosion cracking , metallurgy , cracking , electrochemistry , corrosion , high strength steel , strain rate , strain hardening exponent , stress (linguistics) , composite material , electrode , layer (electronics) , chemistry , linguistics , philosophy
Stress corrosion cracking (SCC) and passivation behaviour of ultra‐high strength steel 23Co14Ni12Cr3 in neutral 3.5 wt% NaCl solution were investigated by slow strain rate test, surface analysis techniques and electrochemical measurements. The passive film on the steel is mainly composed of Fe, Co, Cr and Ni oxides and hydroxides. At potentials less than −850 mV SCE , SCC is controlled by hydrogen induced cracking (HIC). The passive film decreases SCC susceptibility of the steel at −400 mV SCE . While, HIC plays a dominant role on SCC mechanism at OCP.