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WANG Feng, LI Huailin, CAO Xinyuan, LAN Xueying. In-Situ Raman Spectroscopy Investigation of Corrosion Behavior of SiC/SiCf Composite in High-temperature and High-pressure Water[J]. Corrosion & Protection, 2020, 41(11): 33-37,42. DOI: 10.11973/fsyfh-202011005
Citation: WANG Feng, LI Huailin, CAO Xinyuan, LAN Xueying. In-Situ Raman Spectroscopy Investigation of Corrosion Behavior of SiC/SiCf Composite in High-temperature and High-pressure Water[J]. Corrosion & Protection, 2020, 41(11): 33-37,42. DOI: 10.11973/fsyfh-202011005

In-Situ Raman Spectroscopy Investigation of Corrosion Behavior of SiC/SiCf Composite in High-temperature and High-pressure Water

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  • Received Date: June 09, 2020
  • Corrosion test and in-situ Raman spectroscopy measurement for SiC/SiCf composite were carried out using the established high temperature and high pressure circulating water corrosion test system, in-situ observation autoclave and Raman spectroscopy characterization system. The corrosion test environment was an aqueous solution containing 1 200 mg/L H3BO3 + 2 mg/L LiOH. Two series of corrosion experiments were conducted: in one experiment, the oxygen content in solution was not controlled (oxygen content ≈ 2 688 μg/L); in the other experiment, the oxygen content in solution was controlled (oxygen content≈5 μg/L). The results show that the Raman peaks were located near 500、590、715、785、805、870、915、960 cm-1, corresponding to β-SiC matrix and its surface oxide films SiCxOy, SiO2, Si(OH)4 etc., respectively. In the oxygen-saturated solution, surface films were prone to become Si(OH)4, which were not protective. In the oxygen-controlled solution, surface films were stable, and the transformation from SiO2 to Si(OH)4 were retarded. Therefore, the corrosion resistance of SiC/SiCf composite was improved.
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