Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Maintaining environment nondestructive to metal
Patent
1978-11-15
1980-12-02
Garris, Bradley R.
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Maintaining environment nondestructive to metal
422 16, 210 58, 210 60, 210 64, 252180, 252181, 252387, C02F 150, C02F 512, C23F 1106, C23F 1118
Patent
active
042370906
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.
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patent: 3671448 (1972-06-01), Kowalski
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"Metallic Corrosion Ihnibitors", Putilova et al., Pergamon Press (1960), pp. 149-151, 170, 171.
"Aluminum", Solar Age (S-1977), pp. 30 and 31.
"The Ice Bin Cometh", Krause, ORNL, pp. 18-23, 1975.
DeMonbrun James R.
Schmitt Charles R.
Schreyer James M.
Denny James E.
Garris Bradley R.
Hamel Stephen D.
Lewis Fred O.
The United States of America as represented by the United States
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