Corrosion behaviour of electrodeposited nanocrystalline nickel-iron (NiFe) alloys in dilute H₂SO₄
By Leo Monaco, Gordana Avramovic-Cingara, Gino Palumbo, Uwe Erb
Published in Corrosion Science
2018
Abstract
Electrodeposited nanocrystalline and conventional polycrystalline NiFe alloys of similar iron content were investigated to understand the effect of grain size on the corrosion behaviour of these materials. Potentiodynamic polarization testing in 1 N H₂SO₄ revealed similar active-passive-transpassive behaviour with negligible differences in the Tafel and transpassive regions regardless of grain size. It is shown that differences in the region of active dissolution are the result of strong contributions of sulfur impurities in the nanocrystalline electrodeposits rather than being due to grain size alone.