This website uses cookies to ensure you have the best experience. Learn more

Copper Corrosion Essay

983 words - 4 pages

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 temperatures are in the range of 450 to 600oC. Filler metals with working temperatures in the range of 600 to 850oC usually intended for pure copper and some engineering materials, while in the range of 850 to 900oC working temperatures, filler metals designed for brazing in association with methyl borate gas flux. Furthermore, above 900oC filler metals are meant to braze in reducing atmospheres, under inert gas or in vacuum.
The families of phosphorus-containing brazing alloys are the most favored when joining copper and copper-base alloys. These alloys have a unique property, the ability to join copper, without using a flux. [1,2,3]. Silver addition to a copper-phosphorus brazing alloy is well known not only improving its flow characteristic, but also increasing its ductility. Indeed, when silver combined with the alloy, the flow characteristic is more better in regard to the effect of silver that lowering the brazing temperature. Furthermore, better properties in ductility possibly gained at the equal flow characteristic of the silver-free brazing alloy [4,5]. The copper-silver-phosphorus brazing alloys have much attention as consequences of some good properties when used for joining. However, the failures arise...

Find Another Essay On Copper corrosion

Copper as a Valuable Resource Essay

2964 words - 12 pages , malleability, and thermal and electrical conductivity, as well as its resistance to corrosion, make copper very useful as a major industrial metal ( Copper can be refined from metal ores or scrap copper so it can be used as a powder in automotive, aerospace, electrical equipment, in –fouling compounds, and various chemicals and medical processes. Compounds of copper can be found in fungicides

An Analysis of the Properties of Aluminum

1550 words - 6 pages An Analysis of the Properties of Aluminum Physically, chemically and mechanically aluminium is a metal like steel, brass, copper, zinc, lead or titanium. It can be melted, cast, formed and machined much like these metals and it conducts electric current. In fact often the same equipment and fabrication methods are used as for steel. Light Weight Aluminium is a very light metal with a specific weight of 2.7 g/cm3

Releasing Energy through Reactions in Batteries

2101 words - 8 pages change to silver atoms (Ag), which plate the surface. A similar technique is used in electroplating copper, chromium, and gold. CORROSION The chemical deterioration of a material, usually a metal or metal alloy, is called corrosion. The most common causes of corrosion are contact with water and oxygen, though other substances in the earth and in the atmosphere can also cause corrosion. The material with the greatest economic importance

Corrosion Inhibitor for Steel and the Environment

2999 words - 12 pages . [29] K. F. Khaled, “Adsorption and inhibitive properties of a new synthesized guanidine derivative on corrosion of copper in 0.5M H2SO4,” Appl. Surf. Sci. J., vol. 255, pp. 1811–1818, 2008. [30] P. Udhayakala, T. V Rajendiran, and S. Gunasekaran, “Theoretical approach to the corrosion inhibition efficiency of some pyrimidine derivatives using DFT method,” vol. 2, no. 1, pp. 1–15, 2012. [31] R. G. Pearson, “Absolute Electronegativity and Hardness

Changing Raw Material Into Standard Stock with Primary Process

3248 words - 13 pages processed into aluminium by the Hall-Heroult process. This involves dissolving alumina in molten cryolite (super strong acid) and passing a huge current through the bath to separate the oxygen from the aluminium to form molten aluminium. The molten aluminium is then removed and cast into aluminium standard stock (slabs, ingots ect..) Copper Copper ore is mined, but contains very little copper, and is usually in the form of a copper sulphide

Corrosion: The Chemical Process of Oxidation-Reduction

1254 words - 5 pages cations, they are able to oxidize and this makes them prone to corroding when exposed to dampness. Corrosion is the deterioration of materials as a result of a chemical reaction. The most commonly referred to corrosion is the process of rusting. Rusting is harmful as it negatively affects the physical properties of the metals. A corroded piece of iron is not durable, malleable, and will no longer provide functionality. Most metals rust, but the

Corrosion in Heat Exchangers

2159 words - 9 pages the tube material or impediments to flow on the tube wall, such as burrs on the tube ends, blobs of solder, or mineral deposits.Erosion corrosion occurs at locations where turbulence develops in a system. This turbulence interferes with the normal protective film formation on the inside of the tube and also erodes the copper surface at that point. Turbulence can be caused by excessive velocity, sudden changes in direction and flow obstacles such

Shipwrecks, Corrosion and Conservation

4383 words - 18 pages whilst the copper is deposited on the cathode making this electrode bigger. The electrolytic solution is not involved in this reaction and will stay looking the same throughout the experiment. 9.6.4: Iron and steel corrode quickly in a marine environment and must be protected Identify the ways in which a metal hull may be protected including: corrosion resistant metals development of surface alloys new paints Identify


1218 words - 5 pages electrical conductance of copper for wire of a given size, but it weighs less than half as much. An aluminum wire of comparable conductance to a copper wire is thicker but still lighter than the copper. Weight is particularly important in long-distance, high-voltage power transmission, and aluminum conductors are now used to transmit electricity at 700,000 V or more. The metal is becoming increasingly important architecturally, for both structural and


1012 words - 4 pages money. There are other techniques to prolong the metals life including, reducing corrosion so that metals last longer, using abundant metals, finding other materials for some uses.Mining of Copper: Mined at many sites in Australia such as Mt Isa, Olympic dam, Mount Morgan, Mount Lyell, and Tenant Creek. These were first gold mines but profits for gold declined as deeper ores were reached, so mining switched to copper.Separation Process:1

Engineering of Stainless Steet Tea Kettles

885 words - 4 pages has been chosen for this report is made from many of these materials. The materials present in this kettle are stainless steel, copper, thermosetting plastic, rubber and a heating element which is made of a high resistance metal. Stainless steel is one of the materials used in this kettle and is now used more frequently within kettles today because is it impressive properties, one of the main being its resistance to corrosion. Stainless steel

Similar Essays

Corrosion Essay

1492 words - 6 pages the grain boundaries of a metal (such as copper) or alloy. Fretting corrosion is the rapid corrosion that occurs at the interface between contacting, highly loaded metal surfaces when subjected to slight vibratory motions is known as fretting corrosion.Stress Corrosion Cracking (SCC) is caused by the simultaneous effects of tensile stress and a specific corrosive environment. Stresses may be due to applied loads, residual stresses from the

Copper Essay

984 words - 4 pages fields of study and careers such as in heat, electricity, agricultural, coins, roofing and decorating. However, since the price rise of copper it has become less typical to be used in outside decorations and used in smaller quanities when used in trimming. Copper is mainly used outside, in piping and wires because of its characteristics. Copper has the charteristics of most transition metals, which is that copper is durable, corrosion-resistant

Copper Essay

1058 words - 4 pages has a melting point of 1083.3 degrees Celsius. A melting point of a substance is the temperature at which a solid changes to a liquid. Also, the freezing point of Copper is 2567 degrees Celsius. The freezing point of substance is the temperature a liquid changes to a solid.      There are also many physical properties of Copper including conductivity, malleability, ductility, and the resistance against corrosion

Copper Essay

625 words - 3 pages . Ductility is also a good property and is the ability to be molded or bent into a shape. Copper can be pulled into very thin wire. For example, if you took a copper bar, 4 inches (10 centimeters) square, you could draw it into wire thinner then a human hair. One of the most amazing things about copper is its resistence to corrosion. Copper will not rust. However, when the air grows damp, copper will go from reddish-orange to reddish brown