釉瓷和搪瓷.高电压试验

[中文适用范围]： 本国际标准描述了两种高压测试方法： ——测试 A 用于检测和定位搪瓷缺陷； ——测试 B 用于检测和定位釉质和瓷釉中的缺陷和薄弱点。 测试使用直流或脉冲直流高压进行。 该测试适用于搪瓷涂层的干燥表面。 如果表面潮湿，应注意确保正确定位任何缺陷。 由于测试电压取决于涂层厚度，因此测试方法，尤其是测试 A，可能不适用于涂层厚度变化较大的测试样本。 [外文原描述]： ISO 2746:2015 describes two test methods of high voltage testing: - Test A is used to detect and locate defects in vitreous and porcelain enamels; - Test B is used to detect and locate defects and weak spots in vitreous and porcelain enamels. The tests are performed using DC or pulsed DC high voltage. The tests are applicable to dry surfaces of enamel coatings. In the case of moist surfaces, care should be taken to ensure that the locating of any defects is correctly performed. Since test voltages depend on the coating thickness, the test method, especially with test A, may not be suitable for test specimens for which the coating thickness varies to a large extent.