| 摘要 |
<p>Blackening inhibitors for preventing blackening of aluminum or its alloy in antifreeze liquids or cooling liquids; and antifreeze liquid/cooling liquid compositions with the use of the same. These inhibitors comprise hydrocarbyl dicarbonyl compounds and effectively prevent, in antifreeze liquids or cooling liquids free from phosphates, silicates or amine salts, the surface of aluminum or its alloy from blackening. The above compositions are those comprising as the main component glycols and being free from phosphates, silicates or amine salts, characterized by containing from 0.01 to 5.0 % by weight of the above inhibitors.</p> |
