Analysis of AISI 1020 steel corrosion in seawater by coupling electrochemical noise and optical microscopy

2014 ◽  
Vol 124 ◽  
pp. 211-217 ◽  
Author(s):  
Emerson C. Rios ◽  
Alexsandro M. Zimer ◽  
Ernesto C. Pereira ◽  
Lucia H. Mascaro
Keyword(s):  
Optical Microscopy ◽  
Electrochemical Noise ◽  
Steel Corrosion

Dynamics of stainless steel corrosion based on the theory of phase space reconstruction and chaos

2016 ◽  
Vol 63 (3) ◽  
pp. 214-225 ◽  
Author(s):  
Hong Men ◽  
Bin Sun ◽  
Xiao Zhao ◽  
Xiujie Li ◽  
Jingjing Liu ◽  
...  
Keyword(s):  
Phase Space ◽  
Correlation Dimension ◽  
Design Methodology ◽  
Electrochemical Noise ◽  
Steel Corrosion ◽  
Time Domain Analysis ◽  
Phase Space Reconstruction ◽  
Content Type ◽  
Information Method ◽  
Novel Method

Purpose The purpose of this study is to analyze the corrosion behavior of 304SS in three kinds of solution, 3.5 per cent NaCl, 5 per cent H2SO4 and 1 M (1 mol/L) NaOH, using electrochemical noise. Design/methodology/approach Corrosion types and rates were characterized by spectrum and time-domain analysis. EN signals were evaluated using a novel method of phase space reconstruction and chaos theory. To evaluate the chaotic characteristics of corrosion systems, the delay time was obtained by the mutual information method and the embedding dimension was obtained by the average false neighbors method. Findings The varying degrees of chaos in the corrosion systems were indicated by positive largest Lyapunov exponents of the electrochemical potential noise. Originality/value The change of correlation dimension in three kinds of solution demonstrated significant differences, clearly differentiating various types of corrosion.

Microbial consortium influence upon steel corrosion rate, using polarisation resistance and electrochemical noise techniques

2004 ◽  
Vol 49 (25) ◽  
pp. 4295-4301 ◽  
Author(s):  
M.J Hernández Gayosso ◽  
G Zavala Olivares ◽  
N Ruiz Ordaz ◽  
C Juárez Ramirez ◽  
R Garcı́a Esquivel ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Microbial Consortium ◽  
Electrochemical Noise ◽  
Steel Corrosion ◽  
Polarisation Resistance

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

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