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轧制钢板为防止锈蚀常在钢板表面涂覆一层防腐油脂(如脂肪酸酯).而在电镀、涂层工艺中,为了保证镀层及涂层的质量,则要对涂油钢板采取化学法除油或电化学法除油处理.为此在工艺流程中须测定钢板表面的涂油量及除油率.经典的苯浸取——重量法至少须要3000cm~2钢板才能保证测定的准确度,操作手续也十分繁琐不便.目前广泛采用的油膜称重法系根据油膜在水面散开的面积换算钢板表面的含油量,该法须校正,误差较大,且须在钢板涂油后两小时内完成测定,对于贮存较久的钢板不适用.也不能用于钢板除油率的测定.我们根据油脂类在紫外区有较强吸收的特点,采用石油醚提取——紫外吸收光谱法测定钢板表面的涂油量,方法适应范围广,简单快速,重现性好.
Rolled steel to prevent corrosion often coated steel surface with a layer of anti-corrosion grease (such as fatty acid ester.) In electroplating, coating process, in order to ensure the quality of coating and coating, the coated steel to chemical methods Degreasing or electrochemical degreasing treatment.To this end in the process to be determined on the surface of the steel sheet oiled and degreasing rate.Classical benzene leaching - gravimetric method requires at least 3000cm ~ 2 plate in order to ensure the accuracy of the determination , The operating procedures are also very cumbersome inconvenience.Widely used oil film weighing method is based on the surface area of ?? the oil film spread on the surface of the oil content of oil, the law to be corrected, the error is greater, and to be two hours after the steel plate oiled Within the completion of the test, for the storage of steel is not applicable for a long time. Also can not be used for the determination of steel degreasing rate. We have a strong absorption of oil in the ultraviolet region characteristics, the use of petroleum ether extraction - UV absorption spectrometry determination of steel The surface of the oil, the method to adapt to a wide range of simple and fast, reproducible.