Cathodic protection of reinforced concrete
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United States of America Patent
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Oct 16, 2001
Issued Date -
N/A
app pub date -
Aug 20, 1999
filing date -
Jun 16, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
Reinforcement in concrete is cathodically protected by galvanically connecting a sacrificial anode, such as a zinc or zinc alloy anode, to the reinforcement, and contacting the anode with an electrolyte solution having a pH which is maintained sufficiently high for corrosion of the anode to occur, and for passive film formation on the anode to be avoided. The pH of the electrolyte is preferably at least 0.2 units, and preferably from 0.5 units to more than 1.0 units, above the pH value at which passivity of the anode would occur. The electrolyte may be for example sodium hydroxide or potassium hydroxide but is preferably lithium hydroxide which also acts as an alkali-silica reaction inhibitor.
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