Otsuka Kagaku Yakuhin Kabushiki Kaisha

Akiyoshi Inubuse

Shigeo Takahashi

Hideo Yamaguchi

Takashi Kawasaki

A corrosion inhibiting composition which comprises an aqueus medium having dissolved therein an effective amount of at least one of water-soluble 8-hydroxy-s-triazolo[b]pyridazine compounds and watersoluble salts thereof, said water-soluble 8-hydroxy-s-triazolo[b]pyridazine compound having the formula of ##SPC1## Wherein R.sub.1 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms: R.sub.2 is hydrogen atom, an alkyl group having 1 to 10 carbon atoms, phenyl, hydroxyphenyl, nitrophenyl, benzyl, hydroxybenzyl or nitrobenzyl group; and a method for inhibiting corrosion of a metal which comprises contacting a metal with said composition.

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Tokushima, Japan

Akiyoshi Inubuse