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. 試驗目的：針對PCB使用環(huán)境有可能在海上或海邊等空氣中含鹽度較高的地區，因耐鹽度較差會(huì )影響其功能，嚴重時(shí)會(huì )導致重大事故,通過(guò)鹽霧試驗來(lái)驗證產(chǎn)品是否產(chǎn)生腐蝕現像。鹽霧實(shí)驗分中性鹽霧（NSS）、乙酸鹽霧（AASS）、銅加速乙酸鹽霧（CASS）試驗等,中性鹽務(wù)試驗適用于金屬覆蓋層、有機覆蓋層等，其它兩種適用于銅+鎳+鉻等裝飾性鍍層。

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.引用標準

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 電工電子產(chǎn)品基本環(huán)境試驗規程試驗Ka：鹽霧試驗方法；

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 GJB 軍用設備環(huán)境試驗方法鹽霧試驗；

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 金屬基本體上金屬和其它無(wú)機覆蓋層經(jīng)腐蝕試驗后的式樣和試件的評級；

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 ISO 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.中性鹽霧試驗方法：

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">在電導率不超過(guò)20μs/cm的蒸餾水或去離子水中配制成含有5%+/-0.1%的氯化鈉溶液，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;">在溫度35+/-2度，濕度85%以上，以壓力0.7-1.8kgf/cm2，噴霧量1.0-2.0ml/80 cm2/h連續噴霧24小時(shí)（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;">體時(shí)間需客戶(hù)指定），鹽霧箱中樣品按30度角放置，試驗結束后30分鐘以?xún)?，將樣品從鹽霧箱中取出，

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">為了減少腐蝕產(chǎn)物脫落，試樣應先在室內空氣中自然干燥0.5h~1h；然后用溫度不超過(guò)35℃的干凈流動(dòng)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;">將被測試樣小心清洗，以去除試樣表面殘留的的鹽霧溶液，接著(zhù)以距試樣30cm處壓強不超過(guò)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;">空氣吹干，檢查樣品