Relating Surface Scattering Characteristics To Emissivity Changes During The Galvanneal Process

D. P. Hill; R. L. Shoemaker; D. P. DeWitt; D. R. Gaskell; T. F. Schiff; D. White; K. M. Gaskey

doi:10.1117/12.962837

2 January 1990 Relating Surface Scattering Characteristics To Emissivity Changes During The Galvanneal Process

D. P. Hill, R. L. Shoemaker, D. P. DeWitt, D. R. Gaskell, T. F. Schiff, D. White, K. M. Gaskey

Proceedings Volume 1165, Scatter from Optical Components; (1990) https://doi.org/10.1117/12.962837
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

The galvannealing of mild steel is a development of the familiar galvanizing process in which a thin coating of zinc on the surface of the steel, produced by immersion in a bath of liquid zinc, provides protection from corrosion. The zinc coating enhances surface quality as well as provides physical protection and, if the coating is ruptured, provides electrochemical protection by acting as the sacrificial anode in the bi-metallic cell. In the galvannealing process as shown schematically in Figure 1, steel strip is continuously run through a bath of liquid zinc at 465°C. Then it passes through air knives which control the thickness of the liquid zinc film and is then passed through a gas-fired galvannealing furnace, which heats the coated sheet to approximately 550° C. At this temperature the diffusion of iron into the liquid zinc causes the formation of an Fe-Zn intermetallic layer which grows and penetrates the free surface of the liquid zinc. On emerging from the furnace, the strip is air-cooled by fans and then coiled.

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D. P. Hill, R. L. Shoemaker, D. P. DeWitt, D. R. Gaskell, T. F. Schiff, D. White, and K. M. Gaskey "Relating Surface Scattering Characteristics To Emissivity Changes During The Galvanneal Process", Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); https://doi.org/10.1117/12.962837

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