Hi,
1.The water soluble solder paste is designed with water-cleanable residue
so that the extract solution (DI water + IPA) from Omegameter can produce
the reading in acceptable accuracy
2. The undissolved portion can contain both ionic and non-ionic components
depending on the type of chemicals used
3. In my opinon, 1.56 should not be applied in "no clean technology".
However, IPC standard does not clearly state the applicability of this
acceptance limit.
Jackson Chan
Technical Services Manager
Cookson Electronics - Alpha Metals
(Low cost , high reliable alloy : SACX0807)
谢宏涛
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2008/06/16 下午 Subject
06:12 [TGA] 离子洁净度的新问题
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谢宏涛
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大家好：
我看到热心朋友们的回帖，首先谢谢各位专家！
我看到有朋友回的贴说是使用免清洗焊膏，如果用 Omegameter 600做离子洁净
度测试的话，结果值代表不了总的离子污染浓度，因为有固体残留物。如果做对比试
验，也只能证明两者对于混合液的可溶性区别。
但我的问题又来了：
1 、使用可水清洗的焊膏 以及Omegameter 600 做洁净度测试，是否测试
值就是准确的离子洁净度测试值？
2、使用免清洗焊膏，用 Omegameter 600做静态测试，测试结果只能代表
溶于测试液的那部分离子污染物，而没有溶解的白色残留物里面还有离子污染物
吗，还是指非离子的污染呢？
3、如果使用免清洗的焊膏或者波峰助焊剂，做离子洁净度测试，该咋样
做，结果怎样才能满足IPC的标准，是否也要满足小于1.56μg NaCl Eq./cm2？
恳请不吝赐教，小弟谢过！！！
独栋别墅 230万起
