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Corrosion behavior of uniaxially cold-pressed Fe2Mo intermetallic in 0.5M H2SO4

โœ Scribed by R. Morales; A. Albiter; M. Salazar; F.J. Tavera; R. Escudero; J.G. Gonzalez-Rodriguez


Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
349 KB
Volume
397
Category
Article
ISSN
0921-5093

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โœฆ Synopsis


The effect of sintering pressure and temperature on the corrosion resistance of uniaxially cold-pressed Fe 2 Mo intermetallic alloy in 0.5M H 2 SO 4 has been evaluated using electrochemical techniques at room temperature. The intermetallic Fe 2 Mo powder was sintered at 750 โ€ข C at 607, 884 and 1223 MPa and at 900 โ€ข C at 480, 540, 822, 873 and 1040 MPa to produce different porosities. Electrochemical techniques included potentiodynamic polarization curves, electrochemical noise in current, evolution of the free corrosion potential (E corr ) with time and linear polarization resistance to know the change of the corrosion rate with time. Results showed that all the alloys showed a passive region of several hundreds of millivolts wide, and that, regardless the compacting pressure or temperature, practically neither the E corr nor the anodic current density values were affected by these variables, which rapidly reached a steady-state value. At 750 โ€ข C, the corrosion rate increased as the sintering pressure decreased, probably due to the retention of electrolyte inside the porous. At T = 900 โ€ข C, this was not so evident, but it followed a similar tendency. Thus, the electrochemical noise reading showed that precisely at the lowest compacting pressure for 750 โ€ข C, where is expected the highest porosity density, the corrosion type is a localized one, probably pitting, whereas in all the other compacting conditions, where a lower porosity density is expected, the corrosion type is uniform generalized one.


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