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51318-11058-Corrosion Behavior of Austenitic Stainless Steels and Nickel alloys in Simulated HT Geth. Environm.

Picture for Corrosion Behavior of Austenitic Stainless Steels and Nickel alloys in Simulated High Temperature Gethermal Environment
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A 3-week corrosion testing of UNS N06625 was conducted in supercritical fluid at 350°C and 10 bars to simulate a geothermal environment where other alloys had been tested. Some localized corrosion occurred at a rate similar to previous results.

Product Number: 51318-11058-SG
Author: Andri Isak Thorhallsson / Sigrun Nanna Karlsdottir / Andri Stefansson
Publication Date: 2018
Industry: Energy Generation
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$20.00
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A 3-week corrosion testing of UNS N06625 was conducted in supercritical fluid at 350°C and 10 bars. The aim of corrosion testing was to simulate high temperature geothermal environment i.e. IDDP-1 conditions where previous on-site corrosion testing of UNS N06625 and other alloys had been conducted. The simulated environment had lower concentration of H2S and CO2 in the steam comparing IDDP-1 environment. In addition, no silica scaling was precipitated on the samples nor HF was used in the simulated experiment. The corrosion rate was determined with weight loss comparison and the corrosion forms were analyzed with SEM, XEDS and light microscope. The result of the simulated experiment shows that some localized corrosion is occurring and the corrosion rate of UNS N06625 in simulated environment is similar to the corrosion rate observed in IDDP-1.

 Key words: UNS N06625, high temperature corrosion, simulated high temperature geothermal environment, HCl, H2S, CO2, Deep Drilling Project, supercritical fluid, weight loss testing

A 3-week corrosion testing of UNS N06625 was conducted in supercritical fluid at 350°C and 10 bars. The aim of corrosion testing was to simulate high temperature geothermal environment i.e. IDDP-1 conditions where previous on-site corrosion testing of UNS N06625 and other alloys had been conducted. The simulated environment had lower concentration of H2S and CO2 in the steam comparing IDDP-1 environment. In addition, no silica scaling was precipitated on the samples nor HF was used in the simulated experiment. The corrosion rate was determined with weight loss comparison and the corrosion forms were analyzed with SEM, XEDS and light microscope. The result of the simulated experiment shows that some localized corrosion is occurring and the corrosion rate of UNS N06625 in simulated environment is similar to the corrosion rate observed in IDDP-1.

 Key words: UNS N06625, high temperature corrosion, simulated high temperature geothermal environment, HCl, H2S, CO2, Deep Drilling Project, supercritical fluid, weight loss testing

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