It is understood that triethanolamine is a colorless, transparent and viscous liquid at room temperature, with a slight ammonia smell. It is hygroscopic and can absorb moisture and carbon dioxide in the air. Can be freely mixed with water and alcohol, soluble in chloroform, slightly soluble in benzene and ether. The pH of 0.1moI/L solution is 10.5. There is a danger of burning when exposed to high heat, open flame or contact with oxidants. Its aqueous solution is corrosive.
Application and precautions of triethanolamine as a rust inhibitor:
Triethanolamine itself is a water-soluble rust inhibitor. Used alone, it can effectively prevent steel from rusting in the short term. The general concentration is 0.5%~2%.
Used to prepare surfactants, cutting oils, and antifreeze. In the metal processing industry, it can be used to prepare corrosion inhibitors to protect metal surfaces and prevent oxidation.
Triethanolamine has a synergistic anti-rust effect with phenylethanolamine, sodium benzoate, borax, sodium carbonate and other water-soluble rust inhibitors, and its combined use can significantly improve the anti-rust ability.
It should be noted that the anti-rust properties of triethanolamine are very limited. Usually, it needs to be compounded with other organic carboxylic acids. The most important application of triethanolamine is to provide better alkali buffering properties. It has a greater effect in cutting fluids. Triethanolamine has a corrosive effect on copper. Adding 0.05% to 0.1 benzotriazole can improve the corrosion resistance of copper.
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