CORROSION OF HIGH TEMPERATURE ALLOY GH132 TUBE IN THE ENVIRONMENT OF DISPOSING MISSILE PROPELLANT WASTEWATER BY SUPERCRITICAL WATER OXIDATION

J Chin Soc Corr Pro

2004, Vol. 24

Issue (2): 121-124 DOI:

Research Report

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CORROSION OF HIGH TEMPERATURE ALLOY GH132 TUBE IN THE ENVIRONMENT OF DISPOSING MISSILE PROPELLANT WASTEWATER BY SUPERCRITICAL WATER OXIDATION

;;Wei Ke

中科院金属所（南区）

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Abstract Corrosion behavior of a candidate connecting tube, a GH132 tube, for supercritical water oxidation（SCWO）system in the environment of disposing the propellant wastewater by SCWO method with the range of temperatures from room temperature to 520℃ and the pressure of 27.2MPa was studied. The morphology of corrosion surface was analyzed using SEM. Intergranular corrosion (IGC) and shallow pitting occurred respectively when the temperature was above 180℃ and 260℃. Severe stress corrosion cracking was found at 280℃ which leaded to leak of the tube after 151h of testing. The maximum decrease in wall thickness of the tube was measured between 340℃ and 370℃,which amounted to 100μm. Within the supercritical temperature range, corrosion of the tube was obviously mitigated and only very shallow pits could be found. Corrosion products were analyzed using EDX and Fourier transfer infrared spectrometry (FTIR). The selective dissolution of elements such as Fe, Cr and Ni and the formation of corresponding oxides and hydroxides accelerated general corrosion within the subcritical temperature range; while, in the supercritical temperature range, corrosion products was protective due to their very low solubilities. Results showed that GH132 tubes could not be used as connecting tubes at subcritical temperatures.

Key words: Supercritical Water Oxidation（SCWO） superalloy GH132 intergranular corrosion pitting stress corro

Received: 17 December 2003

ZTFLH:

TG172.5

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Wei Ke. CORROSION OF HIGH TEMPERATURE ALLOY GH132 TUBE IN THE ENVIRONMENT OF DISPOSING MISSILE PROPELLANT WASTEWATER BY SUPERCRITICAL WATER OXIDATION. J Chin Soc Corr Pro, 2004, 24(2): 121-124 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I2/121

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