Summary for tin plating burning Discussion
Tin plating burning is the issue here: Hemant from KOEL in Pune reports burned bearings after tin plating in an acid bath containing tin fluoborate, fluoboric acid, and brighteners, even at a current density of 10 A/ft2. The thread excerpt provided includes only the question and no posted diagnosis or remedy, so there is no confirmed answer in the source. Based on the wording, the problem appears to be localized burning during acid tin plating rather than a general plating failure, but the archive excerpt does not identify the cause. Because no responder names or solutions are present in the supplied text, the safest takeaway is simply that the bath is burning parts at the stated current density and further troubleshooting would be needed in the full thread.
Q. Hi
I am facing a problem of burning of the bearings after the tin plating in acid bath. which contains the tin fluoborate, fluoboric acid and brighteners and the current density is 10A/ft2.
Any facing same problem in the past. If any one faced same problem or have any idea about this problem please answer.
More Hemant
KOEL – Pune, Maharashatra, India
2006
A. You gave us the make-up of your tin bath, but what are the metal, acid, and brightener concentrations? If they are all in range, run a Hull Cell ⇦ huh?
to try to duplicate the burning. Add small amounts of brightener to see if the burning can be reduced or eliminated. If you get good results from the hull cell without adding brightener,check the power source on your tin tank with a sample load in place using a multimeter on the buss bars comparing voltage and amperage to the rectifier. If that checks out ok, you could have short or long chain organics present in the bath preventing the tin metal from depositing properly. You could try carbon treating a small amount in the lab, then run another hull cell to see if conditions improve. Let me know how you make out.
Mark Baker
process engineer – Malone, New York
A. Hi,
Get the operating instructions form the chemical supplier and try to find out whether you are plating in the right current density. Also by increasing the concentration of Tin, Raising the bath temperature and increasing the agitation you can solve the burning issue.
Regards,
Prince C
– Chennai, Tamil Nadu, India