Removal of niobium second phase particle deposits from...

Details Removal of niobium second phase particle deposits from... Removal of niobium second phase particle deposits from...

2007-03-07

2008-12-23

Carrillo, Sharidan (Department: 1792)

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

C134S003000, C134S026000, C134S028000, C134S034000, C134S035000, C134S036000, C134S040000, C134S041000, C134S042000, C075S715000, C148S254000, C510S488000

Reexamination Certificate

active

07468106

ABSTRACT:
The present invention provides a method for removing niobium-rich second-phase-particle (SPP) deposits from zirconium-niobium alloy components. The method comprises washing a freshly pickled and rinsed zirconium-niobium alloy component with an acidified oxalic acid or ammonium oxalate washing solution. The method of the present invention results in a rapid, efficient and complete removal of surface SPP deposits from the zirconium-niobium alloy component without pitting, leaving behind a clean, shiny surface without the need to use water blasting or mechanical wiping operations.

REFERENCES:
patent: 2008/0101527 (2008-05-01), McLaughlin
patent: 2008/0230090 (2008-09-01), McLaughlin et al.
Blumenthal, Warren B., “The Chemical Behavior of Zirconium”, 1958, pp. 191-193, D. van Nostrand Company, Inc., Princeton, New Jersey, USA.

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