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Evaluation of 316L and 2205 Steels Under Flow Effects in Caustic Environments

To better understand the mechanism of erosion-corrosion, electrochemical tests were performed on UNS G10180, UNS S31603 and UNS S32205, used in the construction of pulp/paper machinery components exposed to caustic environments.

Product Number: 51317--9158-SG
ISBN: 9158 2017 CP
Author: Bedi Aydin Baykal
Publication Date: 2017
Industry: Process Industries
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$20.00
$20.00

Over the 20th and early 21st century pulp and paper machinery has transformed little in terms of configuration but materials used to construct said machines has changed from carbon steel to austenitic stainless steel and then to duplex stainless steel (DSS). Even with the new material the reliance of the industry on insufficient data on erosion-corrosion or flow induced accelerated corrosionhas led to the selection of inadequate materials and thus frequent failures in pulp mills evaporator and concentrator tubes etc. This warrants a study of the materials in simulated environments that they will encounter in this application. In this study the materials that are typically used in pulp mills including 2205 DSS and 316L Austenitic SS were subjected to simulated black liquor and flow conditions. The response in terms of both corrosion rate and repassivation kinetics were observed using a three electrode electrochemical experiment with a rotating cylinder electrode. Scratch tests were performed to observe the speed and extent of repassivation and the resulting surface was investigated via microscopy and analysis techniques including x-ray photoelectron spectroscopy (XPS) and x-ray fluorescence (XRF).

 

Keywords: Erosion corrosion, UNS G10180, UNS S31603, UNS S32205

Over the 20th and early 21st century pulp and paper machinery has transformed little in terms of configuration but materials used to construct said machines has changed from carbon steel to austenitic stainless steel and then to duplex stainless steel (DSS). Even with the new material the reliance of the industry on insufficient data on erosion-corrosion or flow induced accelerated corrosionhas led to the selection of inadequate materials and thus frequent failures in pulp mills evaporator and concentrator tubes etc. This warrants a study of the materials in simulated environments that they will encounter in this application. In this study the materials that are typically used in pulp mills including 2205 DSS and 316L Austenitic SS were subjected to simulated black liquor and flow conditions. The response in terms of both corrosion rate and repassivation kinetics were observed using a three electrode electrochemical experiment with a rotating cylinder electrode. Scratch tests were performed to observe the speed and extent of repassivation and the resulting surface was investigated via microscopy and analysis techniques including x-ray photoelectron spectroscopy (XPS) and x-ray fluorescence (XRF).

 

Keywords: Erosion corrosion, UNS G10180, UNS S31603, UNS S32205

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