THE EFFECT OF NI ON THE SECONDARY CORROSION PROTECTION OF FE BASED MODEL ALLOYS AT 600 °C

Examensarbete på grundnivå

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/256497
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Type: Examensarbete på grundnivå
Title: THE EFFECT OF NI ON THE SECONDARY CORROSION PROTECTION OF FE BASED MODEL ALLOYS AT 600 °C
Authors: Ollhage, Douglas
Abstract: The formation of secondary protective oxides has been investigated for three different alloys with different wt% nickel. The presence of alkali salts causing severe corrosion of stainless steel in biomass- and waste- fired boilers. All the alloys showed a breakdown of the primary protective oxide scale after exposure to K2CO3 and KCl for 24 hours at 600°C. The samples were sprayed with 1 mg/cm2 of saturated alkali salts before being placed in the furnace. An increased amount of nickel resulted in an increased formation of nickel oxide (NiO) and a decreased formation of iron oxide (Fe2O3). The increase in formation of nickel oxide showed a connection to lower mass gain for all the samples exposed to alkali salts. The nickel oxide was shown to grow slower than the iron oxide and had better protective properties. The alloy containing 34 wt% nickel was specifically targeted by water containing environment.
Keywords: Kemi;Kemiteknik;Chemical Sciences;Chemical Engineering
Issue Date: 2018
Publisher: Chalmers tekniska högskola / Institutionen för kemi och kemiteknik
Chalmers University of Technology / Department of Chemistry and Chemical Engineering
URI: https://hdl.handle.net/20.500.12380/256497
Collection:Examensarbeten på grundnivå // Basic Level Theses



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