ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The corrosion behavior of a nanocrystalline (NC) low carbon steel (LCS) surface filmdeposited on a conventional polycrystalline (PC) LCS by magnetron sputtering was studied in 0.5M H2SO4 solution using impedance and potentiodynamic polarization techniques. The corrosioninhibiting effect of a non toxic organic compound (methionine) and synergistic KI additives wasalso studied. Microstructure characterization by X-ray diffraction and atomic force microscopyrevealed no phase changes due to nanoprocessing and the grain size of the NC surface layer was ~40 nm. Electrochemical results show that both the PC and NC surfaces underwent active corrosionwith no transition to passivation in the potential range studied. Surface nanocrystallization howeverincreased the corrosion susceptibility of low carbon steel more than two-fold, leading to a decreasein interfacial impedance and an increase in the kinetics of the anodic reaction. Methionine inhibitedthe corrosion of both specimens with comparable inhibition efficiencies. Iodide ions synergisticallyincreased the inhibition efficiency of methionine on both specimens. This synergistic effect wasmore pronounced for the bulk steel and has been discussed vis-à-vis the more positive surfacecharge on bulk steel surface at the corrosion potential compared to the nanocrystalline surface
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.38.248.pdf
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