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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.
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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Austenitic stainless steels are susceptible to caustic stress corrosion cracking (SCC) above 121°C. When sulfides are present in caustic solutions the SCC has been reported to occur at lower temperatures. This paper discusses a study of the role of sulfide in caustic solutions on SCC of austenitic stainless at T=~50°C.