从照片上直观的看象是Flux，
应该是锡膏的成分。可以从锡膏着手。
如果你怀疑是PCB板子的话，最简单的方法：把PCB光板过reflow炉就可以验证是否是由PCB带来的。
Best
Regards
Snow
Fu
From: TGAsia [mailto:[log in to unmask]]
On Behalf Of Wang Xiaojin
(AE/MOE2.3-CN)
Sent:
2011年4月15日
13:11
To: [log in to unmask]
Subject: Re: [TGAsia]
PCB工艺产生白胶不良
Hello all:
请教大家,PCB生产工艺中有哪些环节会造成如下图所示的白色胶状物的不良.(我们现在SMT生产过程中发现很多这种不良,而且有些引起多锡了,所以现在觉得应该是PCB来料就有的)
谢谢大家!
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Best Regards!
Leo Wang (王晓金)
* * * * * * * * * * * * * * * * *
* * * * * *
RBAC/MOE2.3-AE
Bosch Automotive Products (Suzhou) Co.,
Ltd.
No.126,
Tel
: +86 (512) 67677281
Email :[log in to unmask]
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