Electrochemical Study of Hot Corrosion of Stainless Steels and Cr-Mo Steel in Na&lt;SUB&gt;2&lt;/SUB&gt;SO&lt;SUB&gt;4&lt;/SUB&gt;-K&lt;SUB&gt;2&lt;/SUB&gt;SO&lt;SUB&gt;4&lt;/SUB&gt;-Fe&lt;SUB&gt;2&lt;/SUB&gt;(SO&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;3&lt;/SUB&gt; Melt

Numata, Hiroo; Yamanouchi, N.; Nunomura, Keiji; Tamura, Manabu; Matsushima, Iwao; Haruyama, Shirō

doi:10.2320/jinstmet1952.51.4_342

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, electrochemical impedance studies of hot corrosion under a thin salt film are necessary for the eventual understanding of corrosion kinetics and corrosion mechanisms. Since the 1980s, EIS has been applied to the study of hot corrosion [2][3][4][5][6][7][8][9][10]. In general, a successful application of the EIS technique in hot corrosion requires suitable models for fitting the impedance spectra.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical-Impedance-Spectroscopy Study of Corrosion of the Alloy NF616 with Molten ZnCl2-KCl Coating in Air at 673 K

Pan¹,

Xue²,

Chen³

et al. 2011

High Temperature Materials and Processes

View full text Add to dashboard Cite

The corrosion behavior of the alloy NF616 covered with a film of molten 0.55ZnCl 2 -0.45KCl (mole fraction), similar to that found in waste incineration plants, was examined in air at 673 K by the electrochemicalimpedance spectroscopy (EIS) technique. For comparison, the corrosion of the same material immersed in the deep salt was also studied. The electrochemical impedance spectra for the corrosion of NF616 beneath a film of fused salt consisted of a semi-circle at high-frequency port and a line at low-frequency port indicating a diffusion-controlled reaction. Contrary to the corrosion beneath salt film, the corrosion of the alloy in deep molten salt presented the characteristics of two capacitive loops during all the duration of the experimental test. This different EIS features under two corrosion conditions may be related to the different supply of oxygen amount. In this paper, suitable equivalent circuits representing the corrosion of the alloy under the two different corrosion conditions are proposed to fit the corresponding impedance spectra and electrochemical parameters in the equivalent circuits are also calculated.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrochemical-Impedance-Spectroscopy Study of Corrosion of the Alloy NF616 with Molten ZnCl2-KCl Coating in Air at 673 K

Pan¹,

Xue²,

Chen³

et al. 2011

High Temperature Materials and Processes

View full text Add to dashboard Cite

show abstract

Characterization of Hot Corrosion of Fe-20Cr Coated with A Fused (Na,K)2SO4 Film By Electrochemical Impedance Spectroscopy

Zeng¹,

Li²,

Liu³

2007

High Temperature Materials and Processes

View full text Add to dashboard Cite

Electrochemical studies of hot corrosion were conducted mostly in deep molten salts, which are not identical to a fused salt film in service conditions. In order to establish electrochemical measurements under a fused salt film, a two-electrode probe was proposed for electrochemical impedance studies of hot corrosion of Fe-20Cr alloy induced by a fused 0.9Na 2 S0 4 -0.1K 2 S0 4 (mole fraction) film at 1173K in air. The corrosion of the alloy was characterized by an initial incubation stage with a relatively low corrosion rate and a later stage with rapid material degradation, accompanied with quite different impedance features. In the initial stage, the alloy formed a protective Cr-rich oxide scale, and the corresponding impedance spectra were composed of two capacitive loops. With extended exposure, the electrochemical impedance spectra showed the typical characteristics of a diffusion-controlled reaction, which was associated with the degradation of Cr-rich scale and the formation of a no-protective mixed scale of oxides and sulfides owing to fluxing of oxide scale as well as internal sulfidation of Cr. Two equivalent circuits were proposed to fit the impedance spectra in two stages. Based on the transport of molecular 0 2 in the melt, Warburg impedance was introduced to calculate the product (Cq 2 a/ d o 2 ) of solubility and diffusion coefficient for oxygen in the melt, and the main reduction reaction was also discussed.

show abstract

Electrochemical Study of Hot Corrosion of Stainless Steels and Cr-Mo Steel in Na<SUB>2</SUB>SO<SUB>4</SUB>-K<SUB>2</SUB>SO<SUB>4</SUB>-Fe<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB> Melt

Cited by 2 publications

References 0 publications

Electrochemical-Impedance-Spectroscopy Study of Corrosion of the Alloy NF616 with Molten ZnCl2-KCl Coating in Air at 673 K

Electrochemical-Impedance-Spectroscopy Study of Corrosion of the Alloy NF616 with Molten ZnCl2-KCl Coating in Air at 673 K

Characterization of Hot Corrosion of Fe-20Cr Coated with A Fused (Na,K)2SO4 Film By Electrochemical Impedance Spectroscopy

Contact Info

Product

Resources

About