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  for Metal Finishing since 1989
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Reel to Reel Solderability

2001

Soderability Problem on Reel to Reel

I need information on troubleshooting solderability problems related to tin plating. We are having difficulty passing a solderability test. We are plating s/s with a ni strike, sulfamate ni followed by tin. We are experiencing de-wetting.

Please advize if there is any info. about this problem available.

Thanks,

George Wulf
plating shop - Miami, Florida

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The sulfamate bath should be squeaky clean (carbon treat), and what kind of tin bath are you using? Organic contamination will cause de-wetting.

  
Tom Pullizzi
Falls Township, Pennsylvania
2001

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Regarding solderability fail, I recommend the followings:

- In case of thin tin thickness by wide thickness distribution and average low thickness,elevate to Min. 250 microinches in thickness.

- In case of organic contamination in the tin bath, check the level regularly:deposit tin on bright dipped sus,dry and peel it off carefully and then measure the carbon level with the carbon analyzer.

- In case of inorganic contamination,copper/nickel,check the metallic impurities by AA unit.

- In case of poor pre-treatment, check the solution and process stages,drag-in?/nickel surface after nickel plating?....

- MSA based plating chemical is recommended.

Nelson NK Key
- Seoul, Korea
2001