Role of Chloride, Sulfate, and Alkalinity on Galvanic Lead Corrosion

Role of Chloride, Sulfate, and Alkalinity on Galvanic Lead Corrosion

Effects of chloride, sulfate, and alkalinity on galvanic corrosion were investigated using beaker tests, lead wire electrochemical tests, and lead solder galvanic cells. At relatively high concentrations of lead and low pH values that might be present at the lead anode surface, sulfate forms precipi...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2011-06, Vol.67 (6), p.65005-65005-9
Main Authors: NGUYEN, C. K, CLARK, B. N, STONE, K. R, EDWARDS, M. A
Format: Article
Language:eng
Subjects:
Alkalinity
Anions
Anodes
Applied sciences
Bicarbonate
Bicarbonates
Brazing. Soldering
Chloride
Chloride transport
Chlorides
Corrosion
Corrosion effects
Corrosion environments
Corrosion tests
Drinking water
Electrochemistry
Electrodes
Electrolytic cells
Equations
Exact sciences and technology
Galvanic corrosion
Joining, thermal cutting: metallurgical aspects
Metals. Metallurgy
pH effects
Precipitates
Sulfates
Transport
Transport equations
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Summary:Effects of chloride, sulfate, and alkalinity on galvanic corrosion were investigated using beaker tests, lead wire electrochemical tests, and lead solder galvanic cells. At relatively high concentrations of lead and low pH values that might be present at the lead anode surface, sulfate forms precipitates with lead while chloride forms soluble complexes, explaining the detriments of chloride and benefits of sulfate during galvanic corrosion in prior research. Considering these factors and transport equations for anions in water, a chloride-to-sulfate mass ratio (CSMR) above 0.77 is predicted to concentrate more chloride than sulfate at the lead anode surface, whereas the converse occurs below this level of CSMR. Bicarbonate can compete with chloride and sulfate transport and buffer pH at the anode surface, providing benefits to lead corrosion.
ISSN:0010-9312
1938-159X