Resistors metallization problem

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Hi to everyone in this forum. I came across this problem re... - Aug 06, 2012 by Reypal

Can you give more info: - Hand-soldered? Placed by Pick&Pla... - Aug 06, 2012 by DucHoang

Thanks DucHoang, More input: 1. Tin/Lead s.paste on Pbfr... - Aug 07, 2012 by Reypal

Reypal

#66951

Resistors metallization problem | 6 August, 2012

Hi to everyone in this forum. I came across this problem recently. Im not sure how it started and its rootcause. The chip resistor termination has been peeled off. Thanks in advance for all your advise.

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DucHoang

#66960

Resistors metallization problem | 6 August, 2012

Can you give more info: - Hand-soldered? Placed by Pick&Place machine? What kind of SMT machine? - Oven re-flowed? Temperature? - Any physical impact?

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Reypal

#66962

Resistors metallization problem | 7 August, 2012

Thanks DucHoang,

More input: 1. Tin/Lead s.paste on Pbfree component 2. Machine pick and place 3. Reflowed@ 210-230C peak @ around 15sec. 4. Boards are subjected to washing process 5. This issue can be seen after washing process.

Do you think it is related to process problem or the component itself?

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