ELECTROCHEMICAL PROPERTIES OF NITRIDED FERROUS MATERIALS
Authors: Ibendorf, K.; Schröter, W.
Source: Surface Engineering, Volume 4, Number 4, 1988 , pp. 327-334(8)
Publisher: Maney Publishing
Abstract:Results of electrochemical and X-ray studies of pure iron and iron based alloys nitrided in an NH3-H2 atmosphere at 550°C are presented. Structural peculiarities of the nitrided layers are related to the solubility of some alloying elements, especially chromium, in iron nitrides. Current density-potential curves recorded on oblique sections at various 'depths' in 0.025M H2SO4 + 0.05M Na2SO4 aqueous solutions show, in principle, a distinct tendency to passivation of 8 compound layers. Significant changes in the electrochemical behaviour of iron-chromium alloys containing ?6.5 and ?13%Cr, as characterised by active anodic dissolution, were observed in the precipitation zone. A potential reversal on nitrided surfaces due to oxygen coverage and some effect of soluble alloying elements on the electrochemical behaviour of the 8 phase were also found.
Document Type: Research Article
Publication date: 1988-01-01
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