Rolled zinc

Rolled Zinc. RoUed-zinc products constitute ca 2—3% of slab zinc consumed in the United States over the past ten years. The U.S. production has declined by ca 50% since 1965 (65) and in 1996 only two companies rolling zinc products were left. 

Walz-werk, n. rolls, roll train, rolling mill, blooming mill, crushing mill, etc. -zink, n. rolled zinc, sheet zinc, -zizm, n. rolled tin, sheet tin. -zunder, m. mill scale, mill cinder, -zustand, m. rolled state. 

Its malleability and ductility make it possible to produce zinc in sheet, strip and plate form by rolling and as rod and wire by extrusion continuous casting is also used. Rolled zinc in sheet and strip form is a well-established... 

Alloys containing up to l o copper and about 0 - l o titanium have been used in strip form for roofing on a large scale in France, Germany, the UK and elsewhere since about 1960, but no details are available on how their corrosion resistance compares with that of the traditional unalloyed rolled zinc. Initially they are lighter in colour and they remain bright a little longer. 

Although there was no significant difference in weight loss between rolled zinc and zinc alloys, the maximum penetration of the alloys definitely appeared to be greater than that of rolled zinc. 

Gravity die cast ZA alloy test plates and 99.99% pure rolled zinc samples were exposed at a waste water treatment plant in Detroit, Michigan, USA. The results after one year are summarised in Table 4.38 . 

Rolled lead-calcium-tin alloy strip, 14 115 Rolled lead-copper alloys, 14 116 Rolled zinc alloys, 26 594-598 Roller-hearth furnace, 12 289, 290 Roller mills, 18 65 Roller printing, 9 221 Rollin film, 17 354, 373 Rolling-assisted, biaxially textured substrate (RABiTS) technique,... 

Notes When specified for use in manufacture of rolled zinc or brass, aluminum is held to 0.005% maximum... 

Metallic zinc is characterized by a brilliant white luster which tarnishes readily to produce the familiar dull gray appearance. Between 100 and 150°C, the metal is both malleable and ductile. Pure zinc melts at 419.3°C and boils at 907°C. The absolute density of cast zinc is 6.94, while that of rolled zinc is 7.14. 

H. Guttman, Effect of Atmospheric Factors on the Corrosion of Rolled Zinc, Metal Corrosion in the Atmosphere, STP 435, ASTM, Philadelphia, PA, 1968, pp. 223-239. 

Data on zinc and zinc products are available from the American Zinc Institute, Inc., of New York. Market development and promotion pamphlets relating to galvanized sheets, metallic zinc paint, and rolled zinc are available at no cost. Information on slab zinc production and shipments is collected monthly. Data on labor are also assembled, monthly, for the membership only. 

Guttman, H. (1968) Effects of atmospheric factors on rolled zinc. Atmospheric Corrosion of Metals, ASTM STP 767, American Society for Testing and Materials, 286-308. 

Galvanised iron, hot dipped Galvanised iron, eleciroplaled Rolled zinc... 

Rolled zinc is produced as sheet, strip, plate, rod, and wire in numerous compositions and alloys, depending on the ultimate uses of the rolled products. When desired, strip is slit into narrow widths. Most sheet zinc is now produced in a single casting and rolling operation, replacing the discontinuous pack rolling method used formerly. 

Table 1.1 Typical Compositions of Selected Rolled-Zinc Alloys (ASTM B69 and BS 6561)... 

Care is needed in assessing performance of alloyed zincs because no reliable accelerated tests are available. Many such tests on new electroplating alloys show a much lower corrosion rate relevant to zinc than is eventually found in service. The titanium present in rolled zinc has only a minor influence on corrosion resistance but, after weathering, this alloy develops a dark shade of gray, whereas the previously produced alloy containing cadmium developed a whitish appearance hence it was aesthetically unwise to mix these alloys in the same roof. 

Hudson and Stanners (1953b) conducted long-term outdoor exposure tests in the United Kingdom on rolled zinc and correlated their results with the amount of sulfur trioxide deposited on lead peroxide (Table 2.7A). Their... 

Table 2.24 Change of Tensile Strength and Rate of Corrosion of Rolled Zinc Plates with Time...

On a holiday tour in France in 1982, H. Swart discovered on a heap of dirt an old discarded grave marker made of rolled zinc. On this zinc plate were inscribed the name of the deceased, his age, and the date of his death 1879. After more than 100 years there is no sign of corrosion. Zinc obviously can survive man ... 

Table 4.1 Corrosion of Rolled Zinc in Various Soils in the United States...

The National Bureau of Standards underground corrosion program (Romanoff, 1957) included tests on commercial rolled zinc and a zinc-4% aluminum-1% copper. Panels were buried in representative soils in 1937, and... 

Mechanical methods (wire brushing, steel wool, abrasives) of cleaning rolled zinc are rarely acceptable. Areas cleaned by such methods tend to contrast... 

Anderson, E. A. (1955). The atmospheric corrosion of rolled zinc. Symposium on... 

Pelzel, E. (1977). Das Korrosionsverhalten von Zinkwalslegierungen in Freigelande und im Damptest (The corrosion behavior of rolled zinc alloys in the open air and in the steam test). Metall, 31(9), 978-981 (in German). 

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