Corrosion in Copper and Copper Alloys Essay

Corrosion in Copper and Copper Alloys Essay

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Copper and copper alloys are widely used in the aqueous environmental application because of their properties in such environment, copper and copper alloys are antimicrobial, they are also have strong mechanical and corrosion resistant properties in aqueous environmental. The combination of these properties has made them a desirable material for many kind of aqueous environmental applications such as condenser tubing, water intake screens, offshore structure, drinking water piping and cooling systems of electrical generators. One of the most widely used methods of joining copper and its alloys is brazing.
Many different types of pure metals and alloys of brazing filler materials are developed, they are available in a variety of forms, they are foil, paste, sheet, powder, wire, rod etc. This to reduce the difficulties of the process putting them between the base metals as various metals have different physical shapes and properties. The process requires a lot of attention and care in order to minimize the gaps in the metals that are being joined which could lead to failure of the brazed joints. The basic qualities of these filler metals that are prerequisites for the successful base metals bonding are : strength, workability in high temperatures and corrosion resistance. There is a large number of metals and alloys and all of them have different compositions, which makes it a critical point to carefully compare and choose the filler metals. The properties and characteristics of the filler metals should essentially match the properties of the base metals to be joined..
However, filler metals are generally divided based on their working temperatures. Aluminum and aluminum alloys commonly brazed with filler metals that the working ...

... middle of paper ...

...ium brazing alloy,” US Patent Publication, Pub. No. : US 2012/0288401 A1, United States of Americaa, 2012.
[6] D. R. Sigler, J. G. Schroth, Y. Wang, D. Radovic, Sulfide-Induced Corrosion of Copper-Silver-Phosphorus Brazed Joints in Welding Transformers, Welding journal, 340-348, vol.86, 2007.
[7] A. Valero-Gomez, A. Igual-Munoz, J. Garcia-Anton, “Corrosion and Galvanic Behavior of Copper and Copper-Brazed Joints in Heavy Brine LiBr Solutions,” Corrosion (2006).
[8] Joseph A. Worden, Jorge M. Mundulas, Understanding, Diagnosing, and Repairing Leaks in Water-Cooled Generator Stator Windings,GE Power Systems, Schenectady, NewYork, 2008.
[9] B.Kempf, E. Sjöstrom, D. Kaufmann, J. Breme, Universität des Saarlandes Saarbrücken, W. Weise, University of Applied Sciences Esslingen, New Filler Metals for Brazing of Stainless Steel. Deutsche Gesellschaft für Materialkunde.

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