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Q&As since 1989
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Coating/Treatments for a Hydrochloric environment
Q. I am a Mechanical Design Engineer, for a company that designs & develops atomic absorption equipment . Currently we have a simple retaining clip made from 1.7 dia stainless steel wire which is powder coated, but this paint becomes brittle and flakes off over time. The clip is placed near hydrochloric acid and so the vapors of the acid corrode the clip very quickly if not treated. Is a PTFE coating the best solution, or is there a better finish we could use?
Regards,
- Cambridge, Cambs, UK
A. Hi James,
There are a large number of thermoplastic coatings that will not be attacked by HCl ... but you didn't spec any temperature.
Firstly, why not make the clip from Titanium?
Secondly, use coatings from PVC, CPVC, PVDF even Pe and PP quite apart from the fluorocarbons such as Teflon and the UK's own 'polymonochlorotrifluoroethylene' (I love short words) ... then there's plastisol coating which, anyhow, is a thick PVC coating.
Incidentally, back in the 60's 'we' (i.e., a Toronto Company) made a CASTABLE neutron shielding for Atomic Energy to replace layers of Boron and Pe. ... just thought you might be interested.
Cheers!
Freeman Newton [deceased]
R.I.P. old friend (It is our sad duty to
advise that Freeman passed away 4/21/12)
A. Nickels are 100% resistant to attack by chloride so using a high phos EN might be the best solution. Would probably want at least 1 mil.
Milt Stevenson, Jr.
Syracuse, New York
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