| 摘要 |
PURPOSE:To obtain a composition preventing effectively the rusting of various metallic materials of an internal-combustion engine at a low cost without generating NOX by adding an adduct of a water soluble amine to benzotriazole, a nitrite, a nitrate, a phosphate and an adduct of a water soluble amine to t-butylbenzoic acid and/or a benzoate. CONSTITUTION:This rust preventive composition contains an adduct of a water soluble amine such as monoethanolamine to benzotriazole, a nitrite such as NaNO2, a nitrate such as NaNO3, a phosphate such as NaH2PO4 and an adduct of a water soluble amine to t-butylbenzoic acid and/or a benzoate. The composition contains components having excellent rust preventive effect for copper, brass and Al castings and solder, and the phosphate and the nitrite, so the rust preventive composition can be effectively applied to an internal-combustion engine and a cooling system for the engine, especially a radiator. |
