Distilled water and sodium carbonate solution were used to soak WC powder and cemented carbide blade, and the influencing factors and mechanism of WC leaching in cemented carbide were studied with the help of scanning electron microscope, X-ray energy spectrometer and other equipment. The results show that water and sodium carbonate can lead to WC leaching in cemented carbide, and the influence of sodium carbonate is very obvious at higher solution temperature. The existence of H+, OH- and HCO3- plasma in the cutting fluid is the root cause of WC leaching.

However, it has been reported in foreign literatures that amino additives can leach cobalt from cemented carbide tools, so they should not be used in grinding cemented carbide tools. As the binder of cemented carbide, the leaching of cobalt will greatly reduce the mechanical impact and service life of cemented carbide tools. At the same time, if the content of cobalt in the waste cutting liquid is too high, it is easy to pollute the environment and cause harm to the health of the operator. Triethanolamine oleic acid is the product of reaction between oleic acid and triethanolamine under certain conditions. Triethanolamine oleic acid was synthesized from ricinoleic acid and triethanolamine. The lubricant is used to soak the cemented carbide blade, and the grinding wheel is used to conduct wet grinding test on the cemented carbide blade with lubricant.

The main metal components on the blade surface were analyzed by KYKY2880 SEM. According to the test results, a method was proposed to add triethanolamine oleate and borax in the cutting fluid to inhibit cobalt leaching from carbide tools.

Test conditions and methods

(1) triethanolamine oleic acid and triethanolamine were prepared by reacting at a molar ratio of 1.5:1 at a temperature of 80-100 ° c for 5-6 hours to synthesize triethanolamine oleate. The concentration is 0. 6% lubricant. The compound solution was prepared with triethanolamine oleate and borax (0.6% triethanolamine oleate and 0.3% borax mass).

(2) grinding test

The wet grinding test of YG8 cemented carbide specimen was carried out on CA6140 lathe with diamond grinding wheel (particle size 80#, grinding wheel diameter 200mm). Install the grinding wheel on the self-made mandrel, one end of the mandrel is mounted on the three-jaw chuck, the other end is supported by the center, and the mandrel is driven by the spindle of the machine tool to rotate (rotation speed: 1120r/min). The carbide specimen is fixed on the tool rest and fed manually. Grinding time is 10 minutes

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