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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the process of obtaining a layer of iron oxides (Fe304 and others) 1-10 microns thick on the surface of components made of carbon or low-alloy steel and cast iron. The coating has a fine crystalline, microporous structure. Blueing is used for decorative finishing. The protective properties of the layers formed during blueing are weak; therefore, after blueing the components are covered with grease to increase their corrosion resistance.

There are various methods of blueing: alkaline blueing, in alkaline solutions with oxidizers at temperatures of 135°-150° C; acid blueing, in acidic solutions by chemical or electrochemical means; and thermal blueing, which is the oxidation of steel at high temperatures—in an atmosphere of superheated water vapor at 200°-480° C, in vapors of an ammonia-alcohol mixture at 520°-880° C, in melted salts at 400°-600° C, or in an air atmosphere at 310CM50° C after first covering the surface of the components with a thin layer of asphalt or oil varnish.


Vainer, la. V., and M. A. Dasoian. Tekhnologiia elektrokhimicheskikh pokrytii. Moscow-Leningrad, 1962.
Bakhvalov, G. T. Zashchita metallov ot korrozii. Moscow, 1964.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Excess lime reduces the ability to take up aluminium which is an essential mineral for the blueing of the flowers.
The afternoon is blueing toward darkness, and as he asks this, I realize how much I am going to miss working with him.
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Alon ("'Redding' and 'Blueing' at Siffin: A Lexical Note," pp.
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For example, one item on the form asks shoppers whether a blueing agent was used in the toilet bowls of the lab they are inspecting.
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A solution of water, ammonia, salt and blueing was poured over the sculptures.
After washing it with tap water, allow it for blueing under running tap water for 10 to 15 minutes.