plating, anodizing, & finishing Q&As since 1989
Suitable sodium nitrite levels to inhibit corrosion
Q. Hey Jim, I also work at an aerosol company, and I would like to know what you guys put in your waterbath besides sodium nitrite to inhibit corrosion.Nick Gootee
- Wayne, Michigan
August 16, 2023
A. Hi Nick,
In addition to the numbers offered on this page by Thushara and Geoff, you can search the site with the search term "rust preventative nitrite" or "corrosion inhibitor nitrite" for a number of other comments on nitrite levels (google doesn't allow us [or anyone] to preload their search engines with search terms.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
⇩ Closely related postings, oldest first ⇩
Q. I work at a 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.
quality assurance - Viburnum, Missouri
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.
air conditioning - Staunton, Virginia
A. Nitrite level should be 1000-1500 ppm.Thushara
- Sri lanka
February 15, 2010
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?
plating manager - York, Pennsylvania, USA
May 13, 2009
A. Suggest about 5 g/litre
- Port Melbourne, Australia
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