Scale removal, ferrous metal passivation and compositions therefor
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United States of America
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Nov 17, 1981
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app pub date -
Sep 14, 1978
filing date -
Jul 23, 1962
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Abstract
.Iadd.Removing iron oxide scale or a mixture of iron oxide scale and hardness scale from a metal surface by contacting said scale with an aqueous solution containing at least one of an ammonium, amine, or hydroxyalkylamine salt of nitrilotriacetic acid, N-2, -hydroxyethylaminodiacetic acid, or alkylenepolyamine polycarboxylic acid at a pH of 8 to 11. .Iaddend.
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