corrosion inhibitor

[siretb]

Please forgive me if this is a naive question:
Formaldehyde is described also as a corrosion inhibitor.
To what extent can it be used to protect alloys like 316L for HCl (hydrochloric) corrosion.
What kind of effective concentration would we be talking about?

 

[rnd2]

National Pollutant Inventory Substance Profile
... Formaldehyde has miscellaneous uses in agriculture for seed treatment, soil disinfection ...
in gasoline; in leather tanning; as a corrosion inhibitor in metal ...

http://www.npi.gov.au/database/substance-info/profiles/45.html

- 20k - 4 Oct 2004 - Cached - Similar pages

[PDF] Epoxy esters as corrosion inhibitors for aluminium pigment
File Format: PDF/Adobe Acrobat
... polyester (SP) and the methylated melamine-formaldehyde resin (MF ... MF do not inhib-
it the corrosion reaction, whereas EPE b is an excellent inhibitor. ...

http://www.ingenta.com/isis/searching/Expand/ingenta?pub=infobike:/

/occa/ct/2001/00000084/00000002/art00009 - Similar pages

[PDF] MATERIALS SCIENCE AND CORROSION PROTECTION
File Format: PDF/Adobe Acrobat
... Corrosion inhibitors are mostly mixtures of derivatives of organic compounds containing
nitrogen, sulfur, oxygen, and phosphorus, as well as formaldehyde, ...

http://www.ingenta.com/isis/searching/Expand/ingenta?pub=infobike:/

/klu/cape/2003/00000039/F0020011/00485841 - Similar pages
[ More results from www.ingenta.com/isis/searching/Expand/ingenta?pub=infobike://klu ]

Formaldehyde abundance
Formaldehyde is ubiquitous. ... It is used in embalming fluid, as a corrosion inhibitor
in oil wells, in the leather tanning process, and in paper production. ...
scidiv.bcc.ctc.edu/wv/Where.html - 2k - Cached - Similar pages

[PDF] Microsoft PowerPoint - Formaldehyde
File Format: PDF/Adobe Acrobat - View as HTML
... Phenol-formaldehyde resins used in plywood ... Preservative, hardening and reducing agent,
corrosion inhibitor, sterilizing agent, in embalming fluids. ...

http://www.coeh.ucla.edu/classes/EHS257 Formaldehyde.pdf

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Volatile corrosion inhibitors--Conservation DistList
... Potje: "Formaldehyde-free fiberboard"; Previous message: Paul Storch: "Edge recognition
software"; Next in thread: Paul Storch: "Volatile corrosion inhibitors"; ...
palimpsest.stanford.edu/byform/ mailing-lists/cdl/1997/1594.html - 5k - Cached - Similar pages

C-020AR CORROSION INHIBITORS
... 36 PHOSPHOROUS-CONTAINING CIS 93 37 MAZER INHIBITOR CORROSION TEST 95 ... CIS 125 58
VAPOR PHASE INHIBITORS 128 59 ... 149 78 1984 & 1992 FORMALDEHYDE CAPACITIES 151 ...

http://www.buscom.com/archive/C020AR.html

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[PDF] FORMALDEHYDE

 

[siretb]

YES, but to what extent is formaldehyde **actually** used to prevent stainless stell/Hastelloy from HCl corrosion?

 

[rnd2]

Sorry I have not replied but have been out of town for a few days.
I do not believe formaldehyde is used or could be used to protect SS from HCL. However, resins films produced from phenol/formaldehyde/epoxy are extremely resistant to water and non oxidising acids, HCL being one of them. They are used to coat the inside of aluminium drink cans as well as large steel drums by applying resin film to the metal skin and baking at high temperature, around 220 deg. C. (428 deg. F). They appear to be effective for these applications and should also be very effective against HCL.
Start by contacting your local phenol/formaldehyde resin producer.