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topic 35006

Suitable sodium nitrite levels to inhibit corrosion


May 13, 2009

Q. I have a history in the metal finishing business and have forgotten an old solution make up that we used for a short term, indoor rust preventive. I remember that it was a heated solution and that the parts had to be dried after immersion so that they wouldn't corrode. This treatment was used after a stripping process, to keep the parts from rusting and essentially "plating line ready" for a few days to a week. No oils were needed and the solution was made up in house. This offered a good short term RP for us and I would like to use the solution again.
Can anybody help? The material used was sodium nitrite and water, and if I remember it was used at 160 °F, with a minute to two minute soak time. The parts were then pulled and dried prior to packing for plating in the next few days.
I cannot remember the make up - any help?

Terry Miller
plating manager - York, Pennsylvania, USA

June 8, 2009

A. Suggest about 5 g/litre

Geoffrey Whitelaw
Geoffrey Whitelaw
- Port Melbourne, Australia


(2005) -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I work at an factory that sends aerosol cans through a water bath with sodium nitrite among other things to inhibit corrosion. Does anybody know what is the recommended concentration of sodium nitrite in ppm to use as a rust inhibitor. Couldn't find anything in print to include in my training manual.
Thank so much in advance.

Jim W [last name deleted for privacy by Editor]
quality assurance - Viburnum, Missouri


Corrosion and Corrosion Control

(2005)

A. Dear Jim,

I am also interested in the responses you have received to your question.

Long ago, at a company I worked, we used to add sodium nitrite to prevent rust forming on pressure vessels put in water tank to perform pressure tests.

But I cannot remember the concentration. Now at another company I want to do same...

help / input would be appreciated.

Thanks

Stan p [last name deleted for privacy by Editor]
air conditioning - Staunton, Virginia


February 15, 2010

A. Nitrite level should be 1000-1500 ppm.

Thushara [last name deleted for privacy by Editor]
- Sri lanka



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