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51314-4489-Advances and Applications of Electrochemical Techniques

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Product Number: 51314-4489-SG
ISBN: 4489 2014 CP
Author: Guru Prasad Sundararajan
Publication Date: 2014
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Corrosion Performances of Rapidly Solidified Aluminum (RSA) alloys in chloride media- Guruprasad Sundararajan* P.R. Subramanian** Mike Gigliotti** Bala Srinivasan* and Vipin S*.AbstractNano-phase metallic alloys of aluminum have been found to provide high stability and strength. By adding alloying elements to aluminum in the melt-spun state followed by rapid solidification stable alloys were formed which provided high strength as well as superior corrosion resistance when compared to conventional high strength alloys such as Al 7075. Electrochemical cyclic polarization scans were performed on several RSA alloys that provided nobler Repassivation potentials (Erp) when compared to Al 7075 (both T7 and T73511). The studied RSA alloys included Al-V-Fe Al-Fe-Ni-Cu and Al-Si systems. Microstructures of RSA alloys were examined through optical and SEM for as received and heat-treated specimens. Some of the aluminum alloys that were made both in the bulk (cast) and nano-phase (ribbon) forms were compared for corrosion performances. The nano-phase ribbons were tested using the Artificial Crevice Electrode (ACE) techniques for determining accurate Repassivation potentials in deaerated chloride media. It was found that the nano-phase Al ribbon alloys had nobler Erp when compared to their bulk forms while that of a high strength Al 7055 alloy had a more active Erp when compared to its bulk form. 
Corrosion Performances of Rapidly Solidified Aluminum (RSA) alloys in chloride media- Guruprasad Sundararajan* P.R. Subramanian** Mike Gigliotti** Bala Srinivasan* and Vipin S*.AbstractNano-phase metallic alloys of aluminum have been found to provide high stability and strength. By adding alloying elements to aluminum in the melt-spun state followed by rapid solidification stable alloys were formed which provided high strength as well as superior corrosion resistance when compared to conventional high strength alloys such as Al 7075. Electrochemical cyclic polarization scans were performed on several RSA alloys that provided nobler Repassivation potentials (Erp) when compared to Al 7075 (both T7 and T73511). The studied RSA alloys included Al-V-Fe Al-Fe-Ni-Cu and Al-Si systems. Microstructures of RSA alloys were examined through optical and SEM for as received and heat-treated specimens. Some of the aluminum alloys that were made both in the bulk (cast) and nano-phase (ribbon) forms were compared for corrosion performances. The nano-phase ribbons were tested using the Artificial Crevice Electrode (ACE) techniques for determining accurate Repassivation potentials in deaerated chloride media. It was found that the nano-phase Al ribbon alloys had nobler Erp when compared to their bulk forms while that of a high strength Al 7055 alloy had a more active Erp when compared to its bulk form. 
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51314-4477-Microbially Influenced Corrosion

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Failure Analysis of Reactor Effluent Air Cooler (REAC) in a Hydrocracker Unit

Product Number: 51314-3730-SG
ISBN: 3730 2014 CP
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A major fire in a Reactor Effluent Air Cooler (REAC) of the Hydrocracker Unit (HCU). Visual inspection was made on the failed portion. Metallurgical investigation, macrostructural and microstructural analysis, Scanning Electron Microscopy, and Energy Dispersive x-ray Spectroscopy was conducted on the failed air cooler.
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