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Corrosion resistance of Inconel alloys in HF conditions
A studywasperformedonsamplesof highalloymaterialswhichare usedinmoltensaltreactors.
Thisprocessinvolvestransformationof uraniumtoitsoxide.The hydrolysisof the uranium
compoundsformsconcentratedHFacid,whichhas strongcorrosionprobabilities.Thistestwas
performedtohave a betterunderstandingof corrosionratesof differenthighalloymaterialsin
concentratedHFand to create a switchingschedule forconversionprocess.
The conversionprocessincludesdifferentpartsandmaterialsof construction,howeverthe partsare
usuallyvalves.These valvesare mainlymade of Monel 400 bodiesandstemtipsand Inconel 600
bellows.Until now,the bellowshadastainlesssteel316 flange ringweldedtothe base.Thisuse of
SS 316 caused several damagesinlabtestsinvolvingthe transferof HF.HastelloyC276 valve bodies
and stemtipshave become availableanditisnow requiredtofindwhetheritismore economical to
replace the valve modulesimmediatelyorwaitforscheduledreplacement.
Basic HF corrosiontestwasconductedto compare corrosionratesof manyhighalloymaterials.As
Monel 400 inthe systemisgoldplated,some goldplatedalloy400couponswere included.Short
termoutcomesshowedavigorouscorrosiononSS 316 below the liquidline.The average corrosion
rate forsteel was1600 to 1800 milsperyearduringthe initial week.Inconel 600samplesoffered
betterperformance averaging120 mpy inthe initial week.Thisalloyexperiencedcorrosioninitially
at the liquid-vaporinterface andinthe areaabove the liquid.Monel 400 receivedlowercorrosion
than Inconel 600. The unlplatedMonel 400and HastelloyC276 offeredthe bestperformanceinthe
short termstudy.Bothalloyshadaverage below 10 mpycorrosionin the firstweek.
The outcomesfromthe prolongtesttendedtoimitate those fromthe short-termtestinregardto
the most andleastaffectedsamples.SS316 experienced60% lossof itsmaterial below the liquid,
causingan average corrosionrate of 550 mpyat the endof 4th
week.The corrosiondepositshelped
to reduce the corrosionrate and secure the metal surface.Inconel 600 couponshad an average
corrosionrate of 128 mpyand Monel 400 showedcorrosionrate of 29 mpy.HastelloyC276 offered
the bestperformance byshowingthe minimumcorrosionrate of 5 mpy andthenofferedvirtually
resistantperformance throughoutthe test.
The issue addressedbythisstudywasto findhow longInconel 600 componentscanperformas
compare to SS 316 bellows.Thisissue is somewhatmore complicated.Inactual,manycomponents
are primarilysubjectedtothe vaporformof HF.Inconel 600 certainlyofferssuperiorperformance at
hightemperaturesandconcentrationsof HFin1 to 60% range andoffersseventimesbetter
performance thanSS316.

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Corrosion resistance of inconel alloys in HF conditions

  • 1. Corrosion resistance of Inconel alloys in HF conditions A studywasperformedonsamplesof highalloymaterialswhichare usedinmoltensaltreactors. Thisprocessinvolvestransformationof uraniumtoitsoxide.The hydrolysisof the uranium compoundsformsconcentratedHFacid,whichhas strongcorrosionprobabilities.Thistestwas performedtohave a betterunderstandingof corrosionratesof differenthighalloymaterialsin concentratedHFand to create a switchingschedule forconversionprocess. The conversionprocessincludesdifferentpartsandmaterialsof construction,howeverthe partsare usuallyvalves.These valvesare mainlymade of Monel 400 bodiesandstemtipsand Inconel 600 bellows.Until now,the bellowshadastainlesssteel316 flange ringweldedtothe base.Thisuse of SS 316 caused several damagesinlabtestsinvolvingthe transferof HF.HastelloyC276 valve bodies and stemtipshave become availableanditisnow requiredtofindwhetheritismore economical to replace the valve modulesimmediatelyorwaitforscheduledreplacement. Basic HF corrosiontestwasconductedto compare corrosionratesof manyhighalloymaterials.As Monel 400 inthe systemisgoldplated,some goldplatedalloy400couponswere included.Short termoutcomesshowedavigorouscorrosiononSS 316 below the liquidline.The average corrosion rate forsteel was1600 to 1800 milsperyearduringthe initial week.Inconel 600samplesoffered betterperformance averaging120 mpy inthe initial week.Thisalloyexperiencedcorrosioninitially at the liquid-vaporinterface andinthe areaabove the liquid.Monel 400 receivedlowercorrosion than Inconel 600. The unlplatedMonel 400and HastelloyC276 offeredthe bestperformanceinthe short termstudy.Bothalloyshadaverage below 10 mpycorrosionin the firstweek. The outcomesfromthe prolongtesttendedtoimitate those fromthe short-termtestinregardto the most andleastaffectedsamples.SS316 experienced60% lossof itsmaterial below the liquid, causingan average corrosionrate of 550 mpyat the endof 4th week.The corrosiondepositshelped to reduce the corrosionrate and secure the metal surface.Inconel 600 couponshad an average corrosionrate of 128 mpyand Monel 400 showedcorrosionrate of 29 mpy.HastelloyC276 offered the bestperformance byshowingthe minimumcorrosionrate of 5 mpy andthenofferedvirtually resistantperformance throughoutthe test. The issue addressedbythisstudywasto findhow longInconel 600 componentscanperformas compare to SS 316 bellows.Thisissue is somewhatmore complicated.Inactual,manycomponents are primarilysubjectedtothe vaporformof HF.Inconel 600 certainlyofferssuperiorperformance at
  • 2. hightemperaturesandconcentrationsof HFin1 to 60% range andoffersseventimesbetter performance thanSS316.