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"Preventing rust on stainless 303 (exposed to high concentration of Chloride)"


Q. We are heat treating rubber parts (hard disk drives) for 10 hours at 260 °C. Our parts have a high concentration of chloride and it causes brown stains (which looks very much like rust) on the surface of 303 stainless steel trays. After the heat cycle the "rust particles" will adhere to our parts and most of it have to be thrown out.

Is there a way to prevent this from happening? I have heard Electroless Nickel plating may be a possibility.

Basilian Lee Yiam Seng
Hard disk drive component manufacturer - Singapore


A. Simple. Use a grade of stainless that has appropriate corrosion resistance for the job. Chlorides are bad news for 300-series stainless steels! Look at something like 2507, or Zeron 100, or similar duplex stainless from other manufacturers that gives good resistance to chlorides and has a high Pitting Resistance Equivalent number - plenty on the market.

Bill Reynolds
Bill Reynolds [dec.]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.



A. With the 303 stainless steel you may be getting sulfide staining, not rust at all. You may be able to smell the sulfide (rotten egg smell) on the parts. If it is sulfides you can remove it with high pH alkaline products.

lee kremer
lee kremer sig
Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois

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A. If the staining is due to chloride attack of the stainless, EN may solve the problem. EN probably will experience little attack at 260 °C. But you should test it to be sure.

Ron Duncan
Ron Duncan [dec]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.


January 15, 2014

Q. Define zeron 100. Why it is called zeron 100? What is link with duplex stainless steel?

vadivel thiyagarajan
chevron - wafra,ahamdi,kuwait

Zeron 100

January 2014

A. Hi cousin Vadivel. If you can explain your situation we may be able to help you resolve it. If you merely want to read about it in general, I don't think we can improve upon the articles already out there on Wikipedia and several other places =>


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

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