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Title: Method for inhibiting corrosion in aqueous systems

Abstract

This invention is a method for inhibiting corrosion in aqueous systems containing components composed of aluminum, copper, iron, or alloys thereof. The method comprises (a) incorporating in the aqueous medium 2-10 ppm by weight of tolyltriazole; an effective amount of a biodegradable organic biocide; 500-1000 ppm by weight of sodium metasilicate; 500-2000 ppm by weight of sodium nitrite; and 500-2000 ppm by weight of sodium tetraborate, all of these concentrations being based on the weight of water in the system; and (b) maintaining the pH of the resulting system in the range of 7.5 to 8.0. The method permits longterm operation with very low corrosion rates and bacteria counts. All of the additives to the system are biodegradable, permitting the treated aqueous medium to be discharged to the environment without violating current regulations. The method has special application to solar systems in which an aqueous medium is circulated through aluminum-alloy heat exchangers.

Inventors:
 [1];  [2];  [2]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863736
Patent Number(s):
4237090
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; inhibiting; corrosion; aqueous; systems; containing; components; composed; aluminum; copper; iron; alloys; comprises; incorporating; medium; 2-10; ppm; weight; tolyltriazole; effective; amount; biodegradable; organic; biocide; 500-1000; sodium; metasilicate; 500-2000; nitrite; tetraborate; concentrations; based; water; maintaining; ph; resulting; range; permits; longterm; operation; rates; bacteria; counts; additives; permitting; treated; discharged; environment; violating; current; regulations; special; application; solar; circulated; aluminum-alloy; heat; exchangers; method permits; aqueous systems; corrosion rate; effective amount; aqueous medium; method comprises; heat exchange; heat exchanger; heat exchangers; sodium nitrite; method comprise; special application; components composed; inhibiting corrosion; alloy heat; systems contain; containing components; /422/210/252/

Citation Formats

DeMonbrun, James R., Schmitt, Charles R., and Schreyer, James M. Method for inhibiting corrosion in aqueous systems. United States: N. p., 1980. Web.
DeMonbrun, James R., Schmitt, Charles R., & Schreyer, James M. Method for inhibiting corrosion in aqueous systems. United States.
DeMonbrun, James R., Schmitt, Charles R., and Schreyer, James M. Tue . "Method for inhibiting corrosion in aqueous systems". United States. https://www.osti.gov/servlets/purl/863736.
@article{osti_863736,
title = {Method for inhibiting corrosion in aqueous systems},
author = {DeMonbrun, James R. and Schmitt, Charles R. and Schreyer, James M.},
abstractNote = {This invention is a method for inhibiting corrosion in aqueous systems containing components composed of aluminum, copper, iron, or alloys thereof. The method comprises (a) incorporating in the aqueous medium 2-10 ppm by weight of tolyltriazole; an effective amount of a biodegradable organic biocide; 500-1000 ppm by weight of sodium metasilicate; 500-2000 ppm by weight of sodium nitrite; and 500-2000 ppm by weight of sodium tetraborate, all of these concentrations being based on the weight of water in the system; and (b) maintaining the pH of the resulting system in the range of 7.5 to 8.0. The method permits longterm operation with very low corrosion rates and bacteria counts. All of the additives to the system are biodegradable, permitting the treated aqueous medium to be discharged to the environment without violating current regulations. The method has special application to solar systems in which an aqueous medium is circulated through aluminum-alloy heat exchangers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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