Effect of electrolyte volume on the acid dissolution of aluminum alloy 7075

Journal Article · Sun Nov 01 04:00:00 EST 1998 · Corrosion

DOI:https://doi.org/10.5006/1.3284805· OSTI ID:289492

McCafferty, E ^[1]

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1. Naval Research Lab., Washington, DC (United States)

Dissolution of aluminum alloy 7075 (UNS A97075) was studied using weight-loss measurements in a series of hydrochloric acid (HCl) solutions varying in concentration from 0.5 M to 2 M. The open-circuit reaction was observed to be first order in the hydrogen ion. In acid solutions having a fixed supply of hydrogen ions, corrosion of Al 7075 was arrested by depletion of that available supply. For a given initial acid molarity (M) and a given initial surface area, the total amount of corrosion (weight loss [G]) is given by G = 0.0101 V M, where V is the volume of solution. For a given set of conditions (initial acid concentration, initial surface area, and volume of solution), the time for cessation of the corrosion reaction as calculated from first-order reaction kinetics was in agreement with experimentally determined values. Two corrosion systems were discussed as possible applications involving cessation of a corrosion reaction in acid environments caused by depletion of the hydrogen ion supply.

• Sponsoring Organization: USDOE
• OSTI ID: 289492
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 11 Vol. 54; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CONCENTRATION RATIO
DISSOLUTION
HYDROCHLORIC ACID
KINETICS
SURFACE AREA
VOLUME
WEIGHT