| 摘要 |
In the inhibition of corrosion and scale formation in a water-carrying system wherein to the water there is added a phosphonocarboxylic acid of the formula <IMAGE> or <IMAGE> in which R is hydrogen, an alkyl, alkenyl or alkinyl radical having up to 4 carbon atoms, an aryl, cycloalkyl or aralkyl radical, or the radical <IMAGE> R' is hydrogen, an alkyl radical having up to 4 carbon atoms or a carboxyl radical; and X is <IMAGE> <IMAGE> the improvement which comprises further adding to the water about 5 to 500% by weight of the phosphonocarboxylic acid of at least one member selected from the group consisting of a benzimidazole derivative, polyacrylamide, polyethyleneimine, polyvinylpyrrolidone and lignin sulfonate.
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