环境试验第2-52部分:试验试验Kb:循环盐雾（氯化钠溶液）

[中文适用范围]： 本测试适用于设计用于承受盐雾环境的组件或设备，具体取决于所选严重程度。盐会降低由金属和/或非金属材料制造的部件的性能。 严重程度(1)和(2)用于测试在海洋环境中或靠近海洋使用的产品。严重程度(1)应用于测试在其大部分使用寿命中暴露于环境的产品（如船舶雷达、甲板设备）。严重程度(2)应用于测试可能偶尔暴露于海洋环境但通常由外壳保护的产品（如通常在桥楼或控制室中使用的导航设备）。 此外，严重程度(1)和(2)通常用作组件质量保证程序中的一般腐蚀测试。 严重程度(3)至(6)适用于在正常使用过程中频繁在盐雾和干燥环境之间变化的产品，如汽车及其部件。 与严重程度(1)和(2)相比，严重程度(3)至(6)因此包括在标准环境下进行额外存储的测试。 干燥环境的时期在实际操作中可能发生在操作间歇期间，例如周末。在严重程度(3)至(6)中包含这样的干燥期会导致腐蚀机制与恒定潮湿条件下的腐蚀机制大不相同。 与大多数使用条件相比，该测试是加速的。然而，不可能为所有类型的样品建立总体加速因子（参见IEC 60355）。 IEC 60068-2的这一部分规定了循环盐雾测试在组件或设备上的应用，这些组件或设备设计用于承受盐雾环境，因为盐会降低由金属和/或非金属材料制造的部件的性能。 [外文原描述]： IEC 60068-2-52:2017 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60068-2-52:2017 specifies the application of the cyclic salt mist test to components or equipment designed to withstand a salt-laden atmosphere as salt can degrade the performance of parts manufactured using metallic and/or non-metallic materials. This third edition cancels and replaces the second edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the entire content has been harmonized with ISO 9227 as far as possible; - an introduction has been added; - the scope has been simplified; - normative references have been updated; - the general description of the test has been changed; - a dry chamber has been added to the test apparatus; - severities have been changed to test methods; - test methods 7 and 8 have been added; - information on the test report has been added; - Figure 1 has been changed to Table 1; - a typical test apparatus example has been added in a new Annex A; - a description of each test method has been added in a new Annex B; - bibliographical references have been added.