| 摘要 |
PURPOSE:To provide a corrosion inhibitor contg. a water-soluble aluminum compd. and an organic acid or its salt which exhibits an excellent and durable corrosion inhibiting effect on metals in an aq. phase. CONSTITUTION:The corrosion inhibitor used for metals in an aq. phase contains a water-soluble aluminum compd. and an organic acid or its salt, and is a nonpoluting agent having an excellent corrosion inhibiting effect. As the above- mentioned water-soluble aluminum compd., >=1 kind among aluminum chloride, aluminum sulfate, aluminum nitrate, etc. is suitably used in the acidic side, a double salt contg. aluminum such as potassium alum or aluminum polycyclic complex such as polyaluminum chloride in the vicinity of neutrality, and alkali metal aluminate in the alkaline side. In addition oxalic acid is preferably used as the organic acid, and >=1 kind among citric acid, tartaric acid, lactic acid, malic acid, glutaric acid, glucoheptonic acid, fumaric acid, maleic acid, adipic acid, malonic acid, and phthalic acid are also used. |
