Where the
world gathers for metal finishing
Q&As since 1989


-----

Can we comply with ROHS without doing trivalent plating

I have read one article that we can do hexavalent plating and dip it in chemical solvent and all hexavalent chromium can be converted to trivalent chrome and it passes ROHS requirement also. Please confirm if there is any process like this.

Thiruvengadam dhanasekaran
buyer of plating components - Chennai, Tamil Nadu, India
September 2, 2008

What is it that you are going to dip into this miracle solvent? Are you plating chromium? If so what is the deposit? Is it hexavalent chromium or something else? Get that facts for what you are doing and read the specification so you can make an informed decision.

Gene Packman
process supplier - Great Neck, New York
September 13, 2008

What we are getting from the supplier is trivalent black, iridescent and blue bright components. I came to know from the article, that instead of doing trivalent passivation it is possible to do hexavalent passivation and dip it in a chemical solvent that will convert 6 valency to 3 valency, ie, hexavalent to trivalent. I hope it clarifies your doubt. Now, I am in need of a chemical supplier who is offering that solvent and anybody who is already doing this type of process.

Dhanasekaran
Automotive supplier - Chennai, Tamil Nadu, India
September 17, 2008

---

Hi, Dhanasekaran. I understand what you are saying, but I have never heard of this reducing agent that you read about, and I do not know of a supplier for it, nor of anybody who is doing it. So, can you give us the particulars of the article you read so that we can read it and see what we think of it?

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 17, 2008

---

Dear sir,

What is the difference between molten salt process & galvanic deposition process for manufacturing platinized titanium anode?

Jay S.
student - Rajkot, Gujarat, India
October 6, 2008