Author: Harshmeet Singh
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: D Féron
Publisher: Elsevier
ISBN: 1845693086
Category : Technology & Engineering
Languages : en
Pages : 219

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Copper and aluminium alloys are widely used in marine engineering in areas such as pipelines, storage tanks, ships’ hulls and cladding for offshore structures. This important book reviews key factors affecting the corrosion and service life of these materials in the marine environment. The book is divided into five parts, with part one reviewing key aspects of the corrosion behaviour of both these alloys. Part two discusses the use of copper and copper-nickel alloys in seawater, whilst Parts 3 and 4 cover aluminium bronzes and alloys. The final section of the book covers the use of aluminium-based materials as anodes for the cathodic protection of marine structures. Corrosion behaviour and protection of copper and aluminium alloys in seawater is an important reference for marine engineers concerned with the corrosion and service life of these materials. Reviews key factors affecting the corrosion and service life of copper and aluminium alloys Discusses the use of the alloys in seawater

Author: Alan B. Riedinger
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 62

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Author: Joseph R. Davis
Publisher: ASM International
ISBN: 9781615032389
Category : Technology & Engineering
Languages : en
Pages : 338

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Author:
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 0

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The corrosion behavior of several commercial aluminum sacrificial anode alloys were studied. Laboratory-scale experiments were conducted to establish the galvanic current output characteristics of the alloys when coupled to HY-80 steel in synthetic seawater. Also direct weight loss measurements of corrosion rates and potentiostatic polarization behavior were obtained, and the mode and distribution of corrosive attack on the various anode alloys were studied by scanning electron microscopy. All the alloys studied show similar galvanic current characteristics as a function of time, with an initially high current density which falls off to a stable value, primarily due to the accumulation of calcareous deposits on the cathodes. The corrosion patterns developed by each alloy are distinctly different, both on the macroscopic and microscopic scale.

Author: Ozymandias Agar
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :

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The purpose of this research is to investigate the corrosion behavior of cold sprayed (CS) aluminum alloys 2024 and 7075 in an immersed seawater environment, and improve understanding of CS processing-microstructure-corrosion property relationships. As a low temperature additive spray technique, CS has an attractive ability to deposit heat-sensitive alloys including AA2024 and AA7075 which is useful for additive repairs. Corrosion is a common damage mechanism which accounts for 1/5 of equipment downtime in the US military, but there is insufficient understanding of the corrosion performance of CS repair materials.This research finds that CS aluminum alloys in an immersed seawater environment can have very similar activity, reactivity, and potentiodynamic response compared to their wrought counterparts, and that CS deposits can even have superior pitting performance. CS corrosion properties, especially activity, change depending on powder heat treatment due to the resulting differences in the size and distribution of alloying element intermetallics. Solutionized CS-7075, for instance, is as active as the wrought (within margin of instrument error), but overaged CS-7075 has a less active Ecorr than wrought AA7075-T651 and in a repair scenario may cause a galvanic couple. Modifying spray processing parameters can cause significant changes in CS-2024 pitting performance without having a meaningful impact on potentiodynamic behavior. CS-7075 corrosion behavior relative to its wrought counterpart AA7075-T651 is stable for a range of electrolyte pH ( 6.2 - 8.6) and shows predictable changes in activity and reactivity that follow those observed in wrought AA7075-T651 for a range of salinity (0.5 1.5 times that found in ASTM D1141 artificial seawater). This results in this dissertation the first set of comprehensive corrosion studies of CS-2024 and CS-7075 in an immersed seawater environment highlight the promising corrosion properties of solid state repairs made from these alloys.

Author: Gopala Venkateswaran
Publisher:
ISBN:
Category :
Languages : de
Pages : 65

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Author: G. A Gehring (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 46

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A study was undertaken to examine the corrosion behavior of selected aluminum alloys in high velocity seawater. The work is pertinent to the development of high speed ships by the U.S. Navy. The selected aluminum alloys included 1100-H14 and 5456-H117. Plate specimens of each alloy were exposed in a flow channel at test velocities ranging from 3 to 30 m/s. The affect of cathodic polarization on the velocity-related corrosion behavior of the 5456 alloy was also investigated. Under the flow conditions established in the study, the results show that: (1) both the rate and mode of corrosion are velocity-dependent for aluminum alloys (2) velocity-related shifts in corrosion potential can occur (3) polarization resistance measurements are inadequate for predicting corrosion rates of aluminum alloys in high velocity flow (4) cathodic protection cannot retard velocity-induced corrosion of aluminum alloys (5) cathodic polarization will tend to accelerate corrosion of aluminum alloys at all velocities tested (6) at higher velocities, the predominant reduction reaction associated with the corrosion of aluminum alloys is H2O plus le give OH- 1/2 H2.

Author: C. Groot
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 76

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Author: J. L. English
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 40

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