copper coating

The super-thick steel walls had been supplemented by a copper coating.

This thin copper coating is more resistant to rough handling and the action of cutting fluid.

The copper coating rubs off and shows an ugly silverish substance underneath.

To begin, scratch off the copper coating on one side of a penny exposing the metal zinc (silver color).

During 1982 the composition of the cent was changed from copper to zinc with a thin copper coating.

(Since 1982, pennies have been mostly zinc with a copper coating; the proposed new dollar would be 80 percent copper, mixed or coated to look like gold.)

In the middle of 1982, after copper prices rose to record levels, the mint starting making pennies that consist mostly of zinc, with just a thin copper coating.

Many collectors lament that even perfectly preserved mid-1982-and-later cents protected in Mint sets have begun tarnishing, developing bubbles beneath the copper coating's surface, or even corroding.

The last West German one- and two-Pfennig coins were steel with a copper coating, the five- and ten-Pfennig coins were steel with a brass coating.

If you ignore the copper coating on its buttons and a small infrared port on its side, the Emotion Mouse looks like any other computer mouse, but it is a very different breed.

Lead-coated copper coatings are used when the appearance of exposed lead is desired or where water runoff from uncoated copper alloys would ordinarily stain lighter-colored building materials, such as marble, limestone, stucco, mortar or concrete.

Without the ability of CMP to remove the copper coating in a planar and uniform fashion, and without the ability of the CMP process to stop repeatably at the copper-insulator interface, this technology would not be realizable.

But the Russians are experimenting with carbon and copper coatings that reduce such losses to 50 percent or less, making a tougher fiber that is easier and cheaper to install, said C. Kumar N. Patel, the executive director of Bell Labs who helped to negotiate the Russian agreement.