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49 results on '"Cavallotti, PIETRO LUIGI"'

9. Surface properties and protection of magnesium alloys

Author

Cavallotti, Pietro Luigi

Abstract

Passivity in aqueous solution of Magnesium and its alloys and the possibility of obtaining corrosion resistant coating onto them depend on this element electrokinetic behaviour: Magnesium is much more active than the other light metals Aluminium and Titanium. This general behaviour is related to a parameter of electrochemical electronegativity for metals in aqueous solutions, the Normality-Inertia parameter PNr A high value ofPNi corresponds to inertia with high overvoltages for metal ion exchanges and low overvoltages for hydrogen exchange at the electronic surface; low PM values correspond to normality with reverse behaviour. The approach is extended to other reactions: oxide, sulphide, fluoride and chloride formation and related to the stability of fluorides at the Magnesium surface. The interpretative scheme is applied to corrosion and protection of the Magnesium alloys.

Published
2013

11. Nano-electrodeposition for hard magnetic layers

Author

Cavallotti, PIETRO LUIGI, Bestetti, Massimiliano, Franz, Silvia, and Vicenzo, Antonello

Subjects
Electrodeposition, Micromagnets, Hard magnetic films, Cobalt, CoPt, CoPtW
Published
2010

25. Magneto-optical δM measurements of interactions in electroplated CoPt films.

Author

Callegaro, Luca, Puppin, Ezio, Cavallotti, Pietro Luigi, Lecis, Nora, and Zangari, Giovanni

Subjects
MAGNETOOPTICS, ELECTROPLATING, THIN films, PALEOMAGNETISM
Abstract

Presents magneto-optical measurements of interactions in electroplated CoPt films. Information on the potential applications of CoPt alloy thin films; Mechanism of exchange decoupling proposed; Types of remanence curves measured.

Published
1995
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38. Foreword

Author

Spyrellis, Nicolas, primary and Cavallotti, Pietro Luigi, additional

Published
2009
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48. Influence of Added Elements on Electroless NiP

Author

Cavallotti, Pietro Luigi and Magagnin, Luca

Abstract

Addition of other metals can greatly influence the Autocatalytic Chemical Deposition ACD NiP plating process. The most important effects are related to possible codeposition, obtaining ternary or quaternary alloys, or stabilization of the bath. Minor, but not less important, effects regard deposit aspect and structure, phosphorus content, corrosion and wear resistance, stability of the deposits with respect to thermal treatments. A general interpretation of the influence of the added elements on the process and the deposit properties is proposed. The behaviour of the added elements is generally anti-correlated with their behaviour in electrodeposition. Elements giving anomalous alloy electrodeposition, such as Zn, Co and Fe behave normally in electroless baths; elements electrodeposited by induction, such as W and Mo, have important effects on the electroless process: they decrease the P content and the deposition rate, while increasing the corrosion resistance. Some of the metal stabilizers, such as Pb, Tl, Hg, Cd, Sb, Bi and Te, can have also a brightening effect on NiP deposits. This is the case of Cd, Sb, Bi and Te and this effect can be related to their interaction with adsorbed hydrogen, which is stabilized by these additives.

Published
2013
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