aluminum passivation
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2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Qi Yao ◽  
Michael J. Stubblebine ◽  
Ivan Catton

An inorganic aqueous solution, known as IAS, has shown its compatibility with aluminum phase-change heat transfer devices. When using IAS in aluminum devices, aluminum prefers to react with the two oxidizers, permanganate and chromate, rather than water to generate a thin and compact layer of aluminum oxide, which protects the aluminum surface and prevents further reactions. In addition, an electrochemical theory of aluminum passivation is introduced, and the existence of an electrochemical cycle is demonstrated by an aluminum thermosiphon test. The electrochemistry cycle, built up by liquid back flow and tube wall, allows the oxidizers to passivate the aluminum surface inside the device without being directly in contact with it. However, failure was detected while using IAS in thermosiphons with air natural convection cooling. The importance of a continuous liquid back flow to aluminum passivation in phase-change heat transfer devices is pointed out, and a vertical thermosiphon test with natural convection cooling is used to demonstrate that a discontinuous liquid back flow is the main reason of the failures.



Author(s):  
Sandra Claeys ◽  
Serge Lievens ◽  
Jurgen De Kimpe ◽  
Paul Van de Ven


2009 ◽  
Vol 23 (9) ◽  
pp. 4231-4235 ◽  
Author(s):  
Birce Dikici ◽  
Steven W. Dean ◽  
Michelle L. Pantoya ◽  
Valery I. Levitas ◽  
R. Jason Jouet


2008 ◽  
Vol 105 (4) ◽  
pp. 1176-1181 ◽  
Author(s):  
J. Korlach ◽  
P. J. Marks ◽  
R. L. Cicero ◽  
J. J. Gray ◽  
D. L. Murphy ◽  
...  


2006 ◽  
Vol 37 (4) ◽  
pp. 321-327 ◽  
Author(s):  
K. Biswas ◽  
S. Das ◽  
D.K. Maurya ◽  
S. Kal ◽  
S.K. Lahiri


2000 ◽  
Vol 147 (12) ◽  
pp. 4512 ◽  
Author(s):  
Sung B. Lee ◽  
Davorin Babí


1996 ◽  
Author(s):  
Pasqualina M. Sarro ◽  
Sebastiano Brida ◽  
W. van der Vlist
Keyword(s):  


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