portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">1. 试验目的：针对PCB使用环境有可能在海上或海边等空气中含盐度较高的地区，因耐盐度较差会影响其功能，严重时会导致重大事故,通过盐雾试验来验证产品是否产生腐蚀现像。盐雾实验分中性盐雾（NSS）、乙酸盐雾（AASS）、铜加速乙酸盐雾（CASS）试验等,中性盐务试验适用于金属覆盖层、有机覆盖层等，其它两种适用于铜+镍+铬等装饰性镀层。
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">2.引用标准
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">2.1 GB/T2423.17-1993 电工电子产品基本环境试验规程试验Ka：盐雾试验方法；
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">2.2 GJB150.11-1986 军用设备环境试验方法盐雾试验；
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">2.3 GB/T 6461-2002金属基本体上金属和其它无机覆盖层经腐蚀试验后的式样和试件的评级；
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">2.4 ISO14993-2001 Corrosion of metals and alloys——accelerated testing involving cyclic exposure to salt mist,” dry” and“wet” condition
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">3.中性盐雾试验方法：
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">在电导率不超过20µs/cm的蒸馏水或去离子水中配制成含有5%+/-0.1%的氯化钠溶液，PH值 6.5-7.2，
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">在温度35+/-2度，湿度85%以上，以压力0.7-1.8kgf/cm2，喷雾量1.0-2.0ml/80 cm2/h连续喷雾24小时（具
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">体时间需客户指定），盐雾箱中样品按30度角放置，试验结束后30分钟以内，将样品从盐雾箱中取出，
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">为了减少腐蚀产物脱落，试样应先在室内空气中自然干燥0.5h~1h；然后用温度不超过35℃的干净流动水
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">将被测试样小心清洗，以去除试样表面残留的的盐雾溶液，接着以距试样30cm处压强不超过200Kpa的
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">空气吹干，检查样品