Effects of Ce on inclusions and corrosion resistance of low‐nickel austenite stainless steel

Abstract

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% H2SO4 solution, 1 mol/L NaHCO3 and 0.5 mol/L Na2CO3 solution. The results demonstrate that addition of Ce to low‐nickel austenite stainless steel forms multi‐phase inclusions containing CeAlO3 and Ce2O2S 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 Rp 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.

Effect of rare earth cerium on the impact toughness, corrosion and wear resistance of CrNiMnMo alloyed lining steel

“…Other studies have shown that the solid solution of rare earth cerium in steel can enhance the corrosion resistance of the steel matrix [17]. Rare earth ce- rium can increase the polarization resistance and free corrosion potential, changing the structure of the compact layer by forming a covering layer which has good adhesiveness and excellent corrosion resistance.…”

Role of Inclusion, Microstructure and Texture Evolution in Soft Magnetic Properties of Fe–6.9 wt%Si Alloy with Yttrium Doping

“…RE elements can significantly reduce the interfacial tension of material and driving force of grain growth, hinder the corresponding atoms from liquid phase to solid phase due to a low equilibrium partition coefficient, [12][13][14][15] inducing the deterioration of heterogeneous nuclei and inhibiting the grain growth during annealing. of 2.5 μm observed in Y-doped sample A2 can effectively affect the texture evolution.…”

Roles of Inclusion, Texture and Grain Boundary in Corrosion Resistance of Low-Nickel Austenite Stainless Steel Containing Ce

“…As is well known, based on vacancy diffusion mechanism, rare earth Ce acted as a resistance for the interfacial tension of liquid-solid two-phase interface can hinder the corresponding atoms from the liquid phase to solid phase, which significantly decrease the nucleation energy and increase nucleation rate of austenite grains. 18) The relation between average grain size and grain growth velocity can be expressed in the following equation: 19) d I Q where d is the average size of austenite grains of annealed samples, as well as ν and I represent grain growth velocity and nucleation rate, respectively. In this study, both the annealed temperature and cooling speed are invariable, as such, the velocity of grain growth is a constant.…”