Passivity and Localized Corrosion of Nickel-based Alloys PDF Download
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Author: Iuan-Jou Yang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Iuan-Jou Yang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Fumio Hine
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 248
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Book Description
Author: Masahiro Seo
Publisher: The Electrochemical Society
ISBN: 9781566772501
Category : Corrosion and anti-corrosives
Languages : en
Pages : 762
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Book Description
Author: Ele Eugene Stansbury
Publisher: ASM International
ISBN: 1615030670
Category : Technology & Engineering
Languages : en
Pages : 487
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Book Description
Covering the essential aspects of the corrosion behavior of metals in aqueous environments, this book is designed with the flexibility needed for use in courses for upper-level undergraduate and graduate students, for concentrated courses in industry, for individual study, and as a reference book.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
The addition of chromium and molybdenum to nickel creates alloys with exceptional corrosion resistance in a diverse range of environments. This study examines the complementary roles of Cr and Mo in Ni alloy passivation. Four nickel alloys with varying amounts of chromium and molybdenum were studied in 1 molar salt solutions over a broad pH range. The passive corrosion and breakdown behavior of the alloys suggests that chromium is the primary element influencing general corrosion resistance. The breakdown potential was nearly independent of molybdenum content, while the repassivation potential is strongly dependant on the molybdenum content. This indicates that chromium plays a strong role in maintaining the passivity of the alloy, while molybdenum acts to stabilize the passive film after a localized breakdown event.
Author: R. W. Staehle
Publisher:
ISBN:
Category : Iron
Languages : en
Pages : 212
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Book Description
Author: Wayne Z. Friend
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 488
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Book Description
Author: Michel Froment
Publisher: Elsevier
ISBN: 1483102629
Category : Technology & Engineering
Languages : en
Pages : 784
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Book Description
Passivity of Metals and Semiconductors covers the proceedings of the Fifth International Symposium on Passivity, held in Bombannes, France on May30 - June3, 1983. The said symposium is concerned with passivity of metallic materials, localized corrosion, experimental techniques, and classical techniques such as optical techniques and electron spectroscopy. The book is divided into five sections. Section I deals with the concepts involved in the composition-transport phenomena and covers topics such as the transport of oxygen and water in oxide layers; the kinetics of oxidation of silicon; and the oxidation rate laws of metals that form nonstoichiometric oxides. Section II covers related techniques and their specific applications such as study of passivity of iron by in situ methods; optical methods in the study of passive films; and the analysis of multiple layer surface films by modulated reflection spectroscopy. Section III tackles amorphous metals - their passivity, their depassivation and repassivation in localized corrosion, and a comparison of models for localized breakdown of passivity. Part IV discusses the photoelectrochemistry of semiconductors; Part V tackles passivation and localized corrosion of stainless steels. The text is recommended for organic chemists, metallurgists, and engineers who would like to know more about the passivity of metals and their applications in different fields.
Author:
Publisher: ASTM International
ISBN: 9780803101104
Category : Aluminum alloys
Languages : en
Pages : 332
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Author: Nafiseh Ebrahimi
Publisher:
ISBN:
Category :
Languages : en
Pages : 388
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Book Description
To enhance its corrosion resistance in aggressive media, Ni is alloyed with various amounts of Cr and Mo along with small amounts of other alloying elements such as W, Cu, and Fe. While the resulting alloys (known as Ni superalloys) show excellent passive behaviour, the function of individual alloying elements in resisting localized corrosion processes, in particular crevice corrosion is not fully understood. This study focuses on the electrochemistry and corrosion of a series of Ni-Cr-Mo (W) alloys with various Cr and Mo contents. Several electrochemical and surface characterization techniques were used to investigate the role of major alloying elements on maintaining passivity and protecting the alloy under crevice corrosion conditions. To initiate crevice corrosion, either galvanostatic or galvanodynamic polarization was used. Using these techniques to apply an electrochemical current the cathodic reaction on the counter electrode is controlled simulating the cathodic reaction needed to drive the anodic crevice corrosion reaction. A comparison of the crevice corrosion behaviour, controlled galvanostatically, of C22 (Ni-22Cr-13Mo-3W), BC1 (Ni-16Cr-22Mo) and C625 (Ni-21Cr- 9Mo) in 5 M NaCl solution at 150°C shows that crevice initiation is mainly controlled by the Cr content of the alloy while both Cr and Mo (Mo +W) synergistically determine the crevice activation rate. Once the crevice is activated, the corrosion damage propagation profile is dominantly influenced by the Mo (Mo + W) content of the alloy and also by the applied current. Higher currents and a higher Mo + W content lead to shallower and more laterally distributed corrosion damage. A series of weight change measurements on BC1, galvanostatically crevice corroded to a constant applied charge, show that internal proton reduction plays a key role in supporting active alloy dissolution, with more than 50% of the corrosion damage supported by this reaction. The results indicate that the alloy resists initiation of crevice corrosion, but once initiation has occurred it can continue to propagate spontaneously. The properties of the oxide films anodically formed on the alloys were investigated before and after a period of dissolution at pH 7 and 9 using electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). The purpose of these experiments was to determine the properties of the passive film formed on the alloy after transpassive dissolution. While Cr is the main element in maintaining passivity, the corrosion resistance of the reformed passive film after transpassive break down is enhanced mainly by Mo. Investigation of the crevice corrosion damage morphology beneath corrosion products, showed intergranular corrosion initiated preferentially on high energy random grain boundaries. Transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) analyses of grain boundaries showed needle shaped inclusions enriched in oxygen and depleted in nickel were present on these boundaries but not on the dominant 3 boundaries.
