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Effects of Ce on inclusions and corrosion resistance of low‐nickel austenite stainless steel
Author(s) -
Cai G.J.,
Li C.S.
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.201508380
Subject(s) - corrosion , materials science , metallurgy , austenite , pitting corrosion , nickel , microstructure
Effects of Ce on the corrosion resistance of low‐nickel austenite stainless steel containing Ce from 0.005 to 0.022 wt% were investigated in 3.5 wt% NaCl solution, 5 wt% H 2 SO 4 solution, 1 mol/L NaHCO 3 and 0.5 mol/L Na 2 CO 3 solution. The results demonstrate that addition of Ce to low‐nickel austenite stainless steel forms multi‐phase inclusions containing CeAlO 3 and Ce 2 O 2 S that can prevent corrosion. Ce addition to steels increases the corrosion resistance owing to metamorphic inclusions and the improvement of electrode potential in the matrix. The pitting corrosion originates from the defects of passive film or inclusions and then continues to expand, deteriorating the pitting corrosion resistance. The EIS measurements indicate that the steels with Ce addition exhibit higher R p values than that without Ce, which demonstrates the relative resistance to corrosion is accompanied by an increasing Ce addition. AISI 202 stainless steel with 0.016 wt% Ce addition in the mass fraction has the best corrosion resistance.