The additives in cutting fluid can promote the leaching of tungsten carbide in carbide cutting tools. Tungsten carbide leaching not only reduces the tool life, causes the waste of resources, but also causes asthma, pulmonary fibrosis and allergic dermatitis. Aimed at cutting process, carbide cutting tools in the phenomenon that the tungsten carbide leaching screening of some commonly used in water base cutting fluid and organic additives, inorganic additives they are investigated respectively the influence law of cemented carbide tungsten carbide in the leaching, leaching mechanism, and synthesis effective inhibitors prevent oxidation dissolution of tungsten carbide carbide cutting tools. The results of immersion test of cemented carbide blade in aqueous solution show that some corrosion pits appear on the surface of the blade after immersion in distilled water. When sodium carbonate solution is added, the alkalinity of aqueous solution decreases and tungsten carbide leaching on blade surface becomes more serious. The above phenomena indicate that tungsten carbide in carbide blades will oxidize to form tungsten trioxide in aqueous solution. When sodium carbonate is added, tungsten trioxide generates its own complex anion tungstate in sodium carbonate solution, which aggravates tungsten leaching due to its high ionization potential and good ability to attract ligands. In order to effectively inhibit the leaching of tungsten carbide on the surface of carbide cutter, the effects of different additives in cutting fluid on the leaching of tungsten carbide were studied.

In the production and cutting process of carbide tools, in order to protect carbide tools, cutting fluid will be used. Cutting fluid can play the role of washing, cooling, lubrication and rust prevention, reducing tool wear. However, some additives in cutting fluid will make cobalt leaching in cemented carbide and tungsten carbide oxidation dissolution and then leaching, destroy the structure of the tool material, accelerate the tool wear. The wear mechanism of triethanolamine solution, sodium carbonate solution, borax solution, benzotriethanolamine solution, oleate triethanolamine solution and oleate triethanolamine, benzotriazolazole and borax solution on cobalt and tungsten carbide in cemented carbidecutting tools was studied by immersion test and energy spectrum analysis. The results showed that borax solution, benzotriazole solution, oleate triethanolamine solution and oleate triethanolamine, benzotriazole and borax composite solution could inhibit the leaching of cobalt and tungsten carbide. At 150degrees , the cemented carbide soaked in borax solution showed no cobalt leaching, and the tungsten leaching rate was 2.88%. The mechanism of borax is as follows: the polarization reaction between the cemented carbide and the system formed by the borax solution slows down the corrosion rate of the cutting tool and inhibits the leaching of cobalt and tungsten from the cemented carbide cutting tool. At room temperature and 150degrees , benzotriazole solution has no leaching effect on cobalt in cemented carbides.

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