N. D. Tomashov

Passivity and Protection of Metals Against Corrosion (eBook, PDF)

• Format: PDF

Produktbeschreibung

Considerable progress has been made in the past 20 years toward understanding the basic mechanisms of corrosion, and the application of this knowledge to its control. From the very beginning, educational institutions and industrial research laboratories have contributed greatly toward determining and elucidating the fundamental principles of corrosion reactions. Some of the basic principles involved in cor rosion of metals can be credited to early investigators. Michael Faraday in 1830-1840 studied the relationship between the quantity of a metal dissolved and the electric current which was produced by this reaction. He also proposed that the passivation of iron was through the formation of a film and that the dissolution of a metal was electro chemical in nature. Sir Humphrey Davy in 1824 worked out the funda mentals of galvanic corrosion of ships' hulls and applied sacrificial zinc anodes to protect them from sea water corrosion. Richard Arlie in 1847 demonstrated that corrosion produced by oxygen at the surface of iron in a flowing stream generated a current. With the fundamental knowledge available to him from these early investigators, Willis Rodney Whitney developed and expressed, in its most useful form, one of the basic scientific principles which provides modern corrosion specialists with a fundamental basis of corrosion control. Dr. Whitney concluded that corrosion of iron is electrochemical, and that the rate is simply a function of the electromotive force and resistance of the circuit.

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Produktdetails

• Verlag: Springer US
• Seitenzahl: 208
• Erscheinungstermin: 6. Dezember 2012
• Englisch
• ISBN-13: 9781468417289
• Artikelnr.: 44064426

Inhaltsangabe

A Note on Soviet Alloy Designations.- I The Phenomenon of Passivity in Metals.- Definition of Passivity.- Mechanism and Theory of Passivity.- Electrochemical Methods for Investigating Passivity.- Anodic Potentiostatic Charge Curves.- Anodic Galvanostatic Charge Curves.- Cathodic Reduction Curves.- Study of Potential Drop Curves.- Measurement of the Double-Layer Capacity.- Study of the Kinetics of Electrode Processes Under the Action of Alternating Currents.- Investigation of the Nature and Structure of Passive Films..- Optical Method.- Electron Diffraction.- Microchemical Method for Determining Film Composition.- Kinetics of the Anodic Processes.- Anodic Processes on a Passive Electrode.- Method of Plotting Potentiostatic Curves.- II Passive Systems.- Active State.- Passive-Active State.- Spontaneously Stable Passive State.- Pitting Formation.- The Transpassive State and Secondary Passivity.- Construction of Corrosion Rate-Potential Curves.- III Basic Principles for Increasing the Corrosion Resistance of Alloys by Increasing Their Passivity.- Inhibiting the Anodic Process.- Reduction of Corrosion in Passive Systems by Increasing the Effectiveness of the Cathodic Process.- IV Anodic Protection.- Anodic Protection of Stainless Steels.- Anodic Protection of Carbon Steels.- Anodic Protection of Titanium.- Practical Application of Anodic Protection.- Prospects for the Development of Anodic Protection.- V Passivation of Metals by Contact with Cathodes.- Use of Cathodic Protectors.- Cathodic Coatings.- of Cations of Electropositive Metals into the Corrosive Medium.- VI Passivation of Metals by the Introduction of Oxidizers into the Corrosion Medium.- Mechanism of the Protective Effect of Oxidizing Inhibitors.- Nature of the Oxidizing Inhibitor.- Effect of the Metal and Aggressiveness of the Medium.- References.