Acid Resistance

acid resistance

The degree to which a surface, such as porcelain enamel, will resist attack by acids.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Acid Resistance

 

the ability of materials to resist the destructive effect of acids.

Acid resistance depends on the nature of the material, the redox properties of the medium, the nature of the anions, and the concentration and temperature of the acids. For example, chromium and chromium steels are stable in 40 percent nitric acid but undergo rapid corrosion in 40 percent sulfuric acid. The acid resistance of materials decreases with temperature. It is important to differentiate between acid resistance in liquid and vapor-gas phases and at the boundary of the two. The acid resistance of metallic materials is determined by loss of mass per unit area (9 per sq m per hr). The acid resistance of nonmetallic organic materials is gauged according to the degree of swelling and the change in mechanical properties (strength, yield point, ultimate elongation). The acid resistance of nonmetallic inorganic materials is determined by the change in mass of the pulverized material after acid treatment.

V. P. BATRAKOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.