The authoritative public forum
  for Metal Finishing since 1989
  

  -----

Suitable location to place Antirust chemical

2006

Hi, I just want to ask if I want to place my antirust chemical in my pretreatment, after which process is the best?

Degreasing x2 (spray) - Degreasing (dip)- Water rinse x2 (spray) - Water rinse (dip) - Water rinse (spray) - surface conditioning - Zinc Phosphating - Water rinse x4 (spray) - E-coating - Water rinse x4 (spray) - Oven

Thanks,

KC Tan
ced - Malaysia

---

Hello KC. Your question is posed as if you were trying to find the place in your process where you can dispose of the chemical with it doing the least harm :-)

Without knowing what this "antirust" chemical is, the usual application is after the zinc phosphatizing and before the e-coat. But I think you might be better off without it.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006

---

2006

Hi Mr. Ted,

Thanks for your help, then the 2nd question is can zinc phosphating help to elminate rust? How we know the solution good in condition? because we utilized the mention solution on steel part too! I'm now facing a lot of rusty issue, can give me some opinion to improve?

Thank you,

KC Tan
ced - Malaysia

---

Your installation sounds very complete and very capable, whether you use DI water or an "antirust" or "chrome acidified rinse" or "sealer" after the zinc phosphate. Are you buying the zinc phosphate process from a capable supplier? If you are, their representative should be sitting in your plant fixing this problem for you. If not, please consider doing so. In the USA no shop attempts to formulate their own zinc phosphate; rather, we all rely on the supplier to provide a proven process and the technical support to properly implement it. There are so many good suppliers that I am reluctant to mention any and slight the others -- but look at some of the responses to phosphating questions in this forum and contact someone who seems knowledgable and whose company offers zinc phosphate processes.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006