Nickel Corrosion and Compatibility in KOH Unit

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engsawalha Active Contributor Join Date: Feb 2010 Location: Jordan Posts: 11	Nickel Corrosion and Compatibility in KOH Unit 02/26/2010 10:44 AM
	Hi Dears, in our KOH Unit we produce a 90%KOH flakes from 50%KOH liquid through evaporator "tube heat exchanger" then a receiver " drum". the liquid 50%KOH is being heated for 380 deg.C. the problem is we have a corrosion of nickel drum which contaminate the product. i searched in ASME II, i found no data about the minimum strength of Nickel 200/201 above 350 deg.C. Could this be the root cause?? Waiting your reply Kind regards __________________ IF THERE IS A DOUBT, NO DOUBT
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s.udhayamarthandan Guru Join Date: Feb 2009 Location: Tamilnadu, India Posts: 836 Good Answers: 42	#1 Re: Nickel Corrosion and Compatibility in KOH Unit 02/27/2010 12:56 AM
	Think of corrosion inhibitors addition[mild dosage of reducing agents of good temperature resistance[stannous chloride, sodium bisulphite, glucose or glucose substitutes like Hydrol] to the 50%KOH liquor. Heat, alkalinity, dissolved oxygen with metals-corrosion is unavoidable. __________________ Nature is so graceful and naked. Human possession is ridiculous.
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welderman Guru Join Date: Sep 2007 Posts: 1601 Good Answers: 58	#2 Re: Nickel Corrosion and Compatibility in KOH Unit 02/27/2010 8:26 AM
	Information on corrosion of nickel in caustic potash (KOH)can be found at http://www.specialmetals.com/documents/Nickel%20200%20&%20201.pdf
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strider6 Power-User Join Date: May 2007 Posts: 225 Good Answers: 4	#3 Re: Nickel Corrosion and Compatibility in KOH Unit 03/02/2010 6:33 AM
	Have a look also at this publications from NIDI ALLOY SELECTION FOR CAUSTIC SODA SERVICE http://www.corrosionsource.com/technicallibrary/nidi/literature/pdf/10019.pdf hope this help u S corrosion & rust protection
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You might be interested in: Nickel and Nickel Alloys, Drum Pulleys, Drum Heaters

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