Tin Plating Issues
February 15, 2010
I am a production engineer in a electroplating company,and we specialize in specification plating on reel to reel parts,which are mostly pins and carrier on either side in strip form.
One of our product requires overall Ni-plating of X-microns and Tin at a specific distance from one end of carrier and Gold at a certain defined distance with thickness X-microns respectively on these pins.We can run the same product on two machine lines with some minor changes in set-up of the respective Cells used for plating different metals on the strip.
When this product is run on Machine line-1 with speed Y rpm, z-current applied to Tin cell,which requires plating only at a certain distance and with a defined spread,the parameters observed are precise good and acceptable,and this Machine line only employs Matt-Tin bath.When the same product is run on machine line-2,with the same Tin cell used for specific plating in line 1 is used in line 2,the spread is observed to be more and not precise.This machine line-2 employs two types of Tin bath viz. Matt Tin and Bright Tin,and these baths use same cell as in Machine Line-1.
My question is why is this variation observed in different lines on the same product when all the parameters such as Temp,pH,Speed and even the Cell used are same.\
Would this be due to that line-1 uses only Matt-Tin Bath and has no contamination with Bright Tin bath as in Line-2..?
Please suggest and share your vast experience on this issue.
Production Engineer - Bengaluru, Karnataka, India
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