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铜在铝合金中的分布Copper Distributions in Aluminium Alloys
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铜在铝合金中的分布Copper Distributions in Aluminium Alloys Aluminium alloys are used extensively throughout the world, in items such as decorative architectural applications through fasteners to high strength structural applications. Such a diverse range of application areas has a similarly diverse range of requirements for materials properties and performance. The mechanical properties are achieved through alloying aluminium with a wide range of elements. Copper, which is one of the major alloying additions, is added in varying amounts to many of the different aluminium alloy series, with the lowest levels in the purest wrought aluminium alloys (AA1xxx series) and the highest levels in the high strength AA2xxx series.The distribution of copper in aluminium alloys varies from copper atoms dispersed in solid solution through the formation of clusters of copper atoms and then onto to a range of intermetallic compositions and particle sizes. The presence of copper in all these forms, particularly in the AA2xxx series, has a significant impact on the chemistry and electrochemistry of the surface of the alloy and, hence, on the susceptibility to corrosion and approaches to metal finishing. This book examines how the copper distributions change, as a result of corrosion reactions, and explores the influence of these changes on continued corrosion. The influence of the distribution of copper in aluminium alloys on metal finishing processes and the redistribution of copper as a result of metal finishing are also examined. Table of contents : COPPER DISTRIBUTIONS IN ALUMINIUM ALLOYS......Page 3 NOTICE TO THE READER......Page 6 CONTENTS......Page 7 PREFACE......Page 9 INTRODUCTION......Page 11 ALLOY MANUFACTURE......Page 15 BULK MICROSTRUCTURE......Page 19 AA2xxx Series Alloys......Page 21 AA4xxx Series Alloys......Page 26 AA7xxx Series Alloys......Page 27 SURFACE MICROSTRUCTURE......Page 28 ELECTROCHEMISTRY......Page 35 THE INFLUENCE OF COPPER IN SOLID SOLUTION......Page 41 THE INFLUENCE OF COPPER IN CATHODIC INTERMETALLICS......Page 44 THE INFLUENCE OF COPPER IN S-PHASE INTERMETALLICS......Page 51 FINISHING PROCESSES......Page 59 SOLVENT CLEANING......Page 61 ALKALINE CLEANING......Page 63 CHEMICAL MILLING......Page 65 WATER RINSING......Page 66 Surface Chemistry......Page 67 ELECTROPOLISHING......Page 79 ANODISING......Page 80 CONVERSION COATING......Page 83 Other Conversion Coatings......Page 92 CONCLUSIONS......Page 93 ACKNOWLEDGEMENTS......Page 95 REFERENCES......Page 97 INDEX......Page 109  11.jpg |
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2014-11-21 09:03:28, 3.43 M
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32楼2015-09-24 10:56:16
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2014-11-21 09:10
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