Abstract
Orthophosphoric acid solutions of sodium orthovanadate, sodium tungstate, and sodium molybdate are tested as potential corrosion inhibitors of the Al2Cu intermetallic phase. Corrosion inhibition is observed for 0.2 M solutions of Na3VO4 and Na2WO4 by increasing the pH to > 2. When the pH is < 2, the aforementioned salts increase the corrosion rate of the intermetallic phase. A 0.2 M solution of Na3VO4 causes the precipitation of vanadium phosphate on the surface of the Al2Cu phase at pH = 1.
Highlights
The intermetallic Al2Cu phase is an important microstructural component of Al–Cu–Mg–Mn and Al–Zn–Mg–Cu wrought alloys because it ensures good strength by forming fine precipitates in the alloy matrix [1]
Sodium molybdate and sodium tungstate form isopolyoxoanions and heteropolyoxoanions when they are dissolved in orthophosphoric acid solution
They were tested as corrosion inhibitors of intermetallic Al2Cu
Summary
The intermetallic Al2Cu phase is an important microstructural component of Al–Cu–Mg–Mn and Al–Zn–Mg–Cu wrought alloys because it ensures good strength by forming fine precipitates in the alloy matrix [1]. The intermetallic Al2Cu phase is itself susceptible to selective corrosion, and when immersed in acidic, neutral, and alkaline solutions, its surface is transformed into a highly porous metallic copper [2, 10]. Sodium orthovanadate, when used at a low concentration (10 mM), significantly increased the corrosion rate of the intermetallic phase (Fig. 1a).
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