Compositions – Radioactive compositions – Nuclear reactor fuel
Patent
1976-12-30
1978-08-08
Wolk, Morris O.
Compositions
Radioactive compositions
Nuclear reactor fuel
252387, 252389A, C09K 1502, C23F 902, C23F 1118
Patent
active
041054067
ABSTRACT:
Method for prevention of corrosion of iron and mild steel surfaces in contact with water. The invention is primarily directed to treatment of potable water such as municipal waters and the like which have limits on the concentrations of additives such as phosphates and the like that have been previously employed for corrosion inhibition. It has been found that the addition of a limited amount of an orthophosphate buffer such as phosphoric acid or sodium dihydrogen orthophosphate greatly reduces the concentration of a hexametaphosphate corrosion inhibitor necessary for passivation of metal surfaces and the necessary level of the metaphosphate for maintaining the passivating film. This combined use of the orthophosphate buffer and the hexametaphosphate inhibitor so greatly reduces the necessary concentration of the latter that it is possible to treat municipal waters in accordance with the invention while meeting all the applicable standards or limits on the concentration of phosphates and the like in the water. In the typical treatment, passivation of the metal surfaces can be achieved at concentrations of the orthophosphate buffer and metaphosphate inhibitor from ten to about twenty parts per million (ppm). After passivation, the concentration of the hexametaphosphate inhibitor can be reduced to a range from 0.5 to about 5 ppm. The passivation treatment is preferably practiced employing the orthophosphate buffer and hexametaphosphate inhibitor in weight proportions from about 2-1 to about 1-2.
REFERENCES:
patent: 2711391 (1955-06-01), Kahler
patent: 2901438 (1959-08-01), Rogers
patent: 3081146 (1963-03-01), Boies et al.
patent: 3099521 (1963-07-01), Arensberg
Garris Bradley
Wolk Morris O.
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