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水溶性淬火介质的浓度变化,使冷却性能发生很大改变。因此,淬火介质在使用中必须测定并控制其浓度,以保证符合工艺规定的冷却性能。一般用化学分析方法测定浓度比较可靠,但测定方法较为繁琐,并应有专门的化验设备,且不可随时在生产现场进行测定。我们用糖量折光仪,直接测试了十种水溶性淬火介质的浓度,证明这是一种简便、易行、可靠的方法。 1.测试方法使用福建泉州光学仪器厂生产的糖量折光仪,量程为0～32%,外形简图如图1。测试了用十种溶质配制的水溶液浓度,包括无机盐:氯化钠、碳酸钠、水玻璃、亚硝酸钠;强碱:氢氧化钠;有机物:尿素、三乙醇胺、聚醚2040、肥皂油和北京产聚乙烯醇淬火介质原液。
Changes in the concentration of water-soluble quenching medium, the cooling performance of a great change. Therefore, the quenching medium must be measured and its concentration in use in order to ensure compliance with the provisions of the cooling performance of the process. Generally, the concentration of chemical analysis method is more reliable, but the determination method is more cumbersome, and should have specialized laboratory equipment, and can not be measured at the production site at any time. We used the sugar refractometer, a direct test of the ten kinds of water-soluble quenching medium concentration, proving that this is a simple, easy, reliable method. 1. Test Method The use of Quanzhou, Fujian Optical Instrument Factory production of sugar refractometer, measuring range of 0 ~ 32%, the outline of Figure 1. The concentrations of aqueous solutions formulated with ten solutes were tested and included inorganic salts: sodium chloride, sodium carbonate, sodium silicate, sodium nitrite; strong bases: sodium hydroxide; organic: urea, triethanolamine, polyether 2040, Beijing produced polyvinylalcohol quenching medium stock solution.