Summary for dry acid salt Discussion
Dry acid salt for brass and Zamak parts is discussed in the context of replacing a sodium bisulfate/sodium fluoride activation mix with sulfamic acid and sodium bifluoride. The questioner says the lab trials on brass and zinc die cast parts produced better-than-expected pickling results and asks why sulfamic acid seems to outperform bisulfate, and whether this is common practice. However, the excerpt provided does not include the actual technical reply, only the question and the answerer attribution line for Qadi john of Baghdad, Iraq. Because the answer text is missing, no firm conclusion can be drawn from the thread excerpt alone about the chemistry, comparative performance, or industry standard practice.
Q. Hi all,
I have a question regarding dry acid salts. In my country we normally use sodium bisulfate and sodium fluoride for the activation of brass and zinc die cast parts. We have started having a shortage of sodium bisulfate and I tested in the lab sulfamic acid and sodium bifluoride and I noticed the pickling results were much better than I expected. I am surprised at this outcome and I started researching. Old articles discuss the use of sulfamic acid for pickling but it seems to be very old. Why is sulfamic giving me better results than bisulfate? Is this a common practice?
A. Qadi john
– Baghdad iraq
March 2, 2024