Modelling of galvanic corrosion based on potentiodynamic polarisation measurements under a thin layer of electrolyte

2015 ◽  
Vol 103 (5) ◽  
pp. 502
Author(s):  
Vit Jeníček ◽  
Linda Diblíková ◽  
Martina Pazderová
Keyword(s):  
Thin Layer ◽  
Galvanic Corrosion ◽  
Potentiodynamic Polarisation ◽  
Polarisation Measurements

Galvanic Corrosion between Magnesium Alloys and Steel

2013 ◽  
Vol 765 ◽  
pp. 648-652 ◽  
Author(s):  
Justyna Janiec-Anwar ◽  
George E. Thompson ◽  
Xiao Rong Zhou ◽  
Michele Curioni ◽  
Mark Turski ◽  
...  
Keyword(s):  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Pure Magnesium ◽  
Corrosion Morphology ◽  
Sodium Chloride Solutions ◽  
Alloy Type ◽  
Potentiodynamic Polarisation ◽  
The Individual ◽  
Coupling Current

The corrosion behaviour of pure magnesium, cast Elektron 21-T6, and extruded Elektron 43-T5, galvanically coupled to mild steel, has been investigated. The coupling current and potential were measured in selected concentrations of sodium chloride solutions in order to establish the effects of the environment and the alloy type on the galvanic corrosion behaviour. The time evolution of the galvanic currents was related to the results of potentiodynamic polarisation and to the corrosion morphologies revealed on specimens comprising a steel bolt and washer after salt spray testing. During the galvanic coupling, the measured current for pure magnesium was less than that for Elektron 21; the highest current was measured for Elektron 43, suggesting the highest corrosion rate. These results were in agreement with the behaviour expected from the individual potentiodynamic polarisation curves. Concerning the corrosion morphology of the galvanic couple, for Elektron 43, the corrosion close to the washer was relatively deep but extended only about 10 mm. For Elektron 21, the corrosion was shallower but advanced further (up to 15 mm). For pure magnesium, a relatively deep and laterally spread attack (approximately 20 mm around the bolt) was developed. These results suggest differences between observed corrosion in galvanically coupled assemblies and corrosion rates expected based on coupling currents alone.

Galvanic protection of steel and galvanic corrosion of zinc under thin layer electrolytes

1993 ◽  
Vol 34 (12) ◽  
pp. 1957-1972 ◽  
Author(s):  
X.G. Zhang ◽  
E.M. Valeriote
Keyword(s):  
Thin Layer ◽  
Galvanic Corrosion

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

Efficiency of Lamb modes in the spatial and frequency acoustic signatures for a thin layer by the resonance theory

2000 ◽  
Vol 10 (2) ◽  
pp. 97-108
Author(s):  
A. Ramdani ◽  
F. Augereau ◽  
M. Sidki ◽  
G. Despaux
Keyword(s):  
Thin Layer ◽  
Resonance Theory ◽  
Acoustic Signatures

Straightforward process for the identification and isolation of natural products using thin-layer and preparative chromatography

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
M Schulte ◽  
M Oberle ◽  
M Sixt ◽  
J Strube
Keyword(s):  
Natural Products ◽  
Thin Layer ◽  
Preparative Chromatography
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