Hi Mr. Lu,

I think you have to find the real reasons for these issues. First of all, I think verdigris is not acceptable because it means the oxidation of cooper, in another word, copper is not protected well. They will break your joint in the future.





Best Regards,



James Liu 刘春光

Director, Technology & Standardization 技术与标准总监

IPC China

上海市长宁区延安西路1088号2303室

Suite 2303，#1088 West Yan'an Rd., Changning, Shanghai 200052 PRC

Tel:   +86 21 5497 3435

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________________________________

发件人: Lu Zhengqiang (RBAC/MOE2.4-AE) [[log in to unmask]]

发送时间: 2009年10月28日 16:23

收件人: James Liu

抄送: Listserv TGAsia; Hao Leon (RBAC/TEF8-AE); Liu SY (RBAC/QMM-AE3)

主题: verdigris on the pin



Hello, James,

            Sorry for disturb you.



            We meet a problem that the verdigris on the electrolytic capacitor pin (picture 1), and after reflow, the verdigris melt, like black oil on the pin (picture 2);

Picture 1                                                                          Picture 2

[cid:[log in to unmask]] [cid:[log in to unmask]]  [cid:[log in to unmask]]



            Here we have some concerns:

1.       Only considered the soldering status, according to IPC-A-610D 8.2.5, we think it's acceptable, because the “black oil” only on the toe of the pin, what’s your opinion? Agree or not？

2.       For the verdigris, it is acceptable or not when it appeared?

3.       Dose the verdigris will cause any influence to the reliability of the pin or function of the component?

4.       Do you have some other considerations?







Thanks & Best Regards

_______________________

BeQIK

Zhengqiang Lu (Mr.)

RBAC/MOE2.4-AE



Tel.      +86(512)6767 5768

Fax.     +86(512)6256 5236

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