Zinc-copper alloys

Trichloroethanol may be used analogously. The 2,2,2-trichloroethyl (Tee) group is best removed by reduction with copper-zinc alloy in DMF at 30 °C (F. Eckstein, nucleic acid synthesis see section 4.1.1. 

Copper—Zinc Brasses. Copper—zinc alloys have been the most widely used copper alloy during the 1990s. It is no accident that the word brass is included in the name of many copper alloy manufacturers. The manufacture of brass buttons and other brass artifacts was the principal reason for the estabhshment of the U.S. copper alloy industry in Connecticut during the 1800s. 

Table 20. Conductivity and Wrought Tensile Properties of Modified Copper—Zinc Alloys...

Standard Test Methods for Use ofMattsson s Solution of pH 7.2 to Evaluate the Stress Corrosion Cracking Susceptibility of Copper—Zinc Alloys, ASTM G 37-85, American Society for Testing and Materials, Philadelphia, Pa., 1992. 

In most respects, copper-nickel and copper-tin alloys behave similarly to copper-zinc alloys. The presence of acids, hydrogen sulfide, ammonia, and carbon dioxide degrades corrosion resistance. 

Munition,/, ammunition, munition(s). munter, a. live, lively, cheerful, vigorous. Muntzmetall, n, Muntz metal (copper-zinc alloy). 

Wilde, B. E. and Teterin, G. A., Anodic Dissolution of Copper-Zinc Alloys in Alkaline Solutions , Brit. Corrosion J., 2, 125 (1967)... 

Alloys containing only a few per cent of zinc may fail if the stresses are high and the environment sufficiently corrosive. Most types of brass, besides the plain copper/zinc alloys, appear to be susceptible to stress corrosion. An extensive investigation of the effect of additions to 70/30 brass was carried out by Wilson, Edmunds, Anderson and Peirce , who found that about 1% Si was markedly beneficial. Other additions were beneficial under some circumstances and none of the 36 additions tested accelerated stress-corrosion cracking. Further results are given in later papers ... 

Copper-zinc Copper-zinc alloys are deposited for two main purposes (a) as a decorative finish, e.g. on steel and (b) as a means of obtaining an adhesive bond of rubber to other metals. 

Copper-tin Although a wide range of copper-zinc alloy deposits can be plated, most experience has been gained with two compositions, i.e. the red copper-rich tin-bronze which contains 90-93% copper and 10-7% tin and the white speculum which contains 50-60% copper and 50-40% tin. 

The comprehensive investigation by Eddy and Laby5 may serve as the classic example of what can be accomplished with electron excitation and a photographic plate as detector. Their results on a copper-zinc alloy are particularly remarkable for the high precision attained. To be sure, this case is among the most favorable that can be imagined. 

Fig. 9-13. Analytical data obtained by point-to-point exploration with a microprobe, showing the variation of composition of a copper-zinc alloy in a region of diffusion. (After Castaing and Guinier, Anal. Chem., 25, 724.)...

Copper-zinc alloy, analysis, 177-179 Corrosion, of Monel metals, study by x-ray emission spectrography, 231 of stainless steels, study by x-ray emission spectrography, 230, 231 Counter, windowless, 55, 222 Counterfeit bank notes, histograms from, 225-227 Counters, see Detectors Counting, electronic, 46 Counting error, 65, 66 equation, 66, 278... 

One of several corrosion resistant copper/zinc alloys (e.g. 70% Cu + 30% Zn). See Admiralty brass. 

Because the metallic radii of the d-block elements are all similar, they can form an extensive range of alloys with one another with little distortion of the original crystal structure. An example is the copper-zinc alloy used for some copper coins. Because zinc atoms are nearly the same size as copper atoms and have simi-... 

Aluminium-copper-zinc alloy (Devarda s alloy)... 

See Copper-zinc alloys Diiodomethane, etc. Lithium Halocarbons Potassium Halocarbons... 

See MOLTEN METAL EXPLOSIONS See other METALS 4268. Copper-zinc alloys... 

Alloys of copper and zinc can be obtained by combining the molten metals. However, zinc is soluble in copper up to only about 40% (of the total). When the content of a copper/zinc alloy contains less than 40% zinc, cooling the liquid mixture results in the formation of a solid solution in which Zn and Cu atoms are uniformly distributed in an fee lattice. When the mixture contains more than 40% zinc, cooling the liquid mixture results in the formation of a compound having the composition CuZn. The solid alloy consists of two phases, one of which is the compound CuZn and the other is a solid solution that contains Cu with approximately 40% Zn dissolved in it. This type of alloy is known as a two-phase alloy, but many alloys contain more than three phases (multiple-phase alloys). 

Attractive metallic effects can be obtained by incorporating very thin, small flakes of aluminium, copper or copper/zinc alloys in otherwise transparent surface coatings. The metal flakes act as tiny mirrors within these paints, which are particularly effective on the curved surfaces of cars since the colour changes with the angle from which the surface is viewed. The orientation of the flakes within the paint film also changes the colour seen by the eye, so that careful dispersion of the metal components of the paint is essential. 

Individually indexed alloys or intermetallic compounds are Aluminium amalgam, 0051 Aluminium-copper-zinc alloy, 0050 Aluminium-lanthanum-nickel alloy, 0080 Aluminium-lithium alloy, 0052 Aluminium-magnesium alloy, 0053 Aluminium-nickel alloys, 0055 Aluminium-titanium alloys, 0056 Copper-zinc alloys, 4268 Ferromanganese, 4389 Ferrotitanium, 4391 Lanthanum-nickel alloy, 4678 Lead-tin alloys, 4883 Lead-zirconium alloys, 4884 Lithium-magnesium alloy, 4681 Lithium-tin alloys, 4682 Plutonium bismuthide, 0231 Potassium antimonide, 4673 Potassium-sodium alloy, 4646 Silicon-zirconium alloys, 4910... 

The Romans manufactured a copper-zinc alloy which they called orichalcum or aurichalcum. In speaking of copper, Pliny the Elder... 

This term was originally used to describe copper-tin alloys. It is now used to describe any copper alloy, except copper-zinc alloys, containing up to 25% of the principal alloying element. Some examples include ... 

Copper—lead—tellurium alloys have high wear resistance in sliding contacts. In copper—zinc alloys, the benefits of tellurium decrease with increasing zinc content and almost disappear when the zinc content exceeds 35%. 

Definition. Metal effect pigments consist of flakes or lamellae of aluminum (aluminum bronzes), copper and copper-zinc alloys ( gold bronzes ), zinc, and other metals (DIN 55943, 55944 FSO 4618-1). 

Copper and Gold Bronze Pigments. Copper and gold bronze pigments (powdered copper-zinc alloys) are usually produced by dry milling. Depending on the alloy composition, the following natural shades are produced ... 

Copper-zinc alloys with a higher zinc content (brass) cannot be ground or formed into flake pigments on account of their brittleness. Controlled oxidation of natural bronze powders converts them into fired bronze powders. These shades (e.g., English green, lemon, ducat gold, fire red) are produced as a result of interference effects that depend on the thickness of the oxide coating. 

Nickel essentially is added to copper-zinc alloys to enhance color. 

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