EFFECT OF RARE EARTH ADDITIONS TO THE MELT ON HOT CORROSION RESISTANCE OF ALLOY HK40

J Chin Soc Corr Pro

1992, Vol. 12

Issue (1): 27-33 DOI:

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EFFECT OF RARE EARTH ADDITIONS TO THE MELT ON HOT CORROSION RESISTANCE OF ALLOY HK40

Wu Weitao; Niu Yah; and Zhang Jianqing (Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals;Academia Sinica)

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Abstract The effect of CeCl_3 additon to bulk melt 75wt% Na_2SO_4+25wt% NaCl on the hot corrosion behavior of alloy HK40 at 800℃ was investigated by electrochemical methods. The free corrosion potential, the polarization resistance and the corrosion current density were measured and calculated. Potentionstatie polarization tests at EAg=812mV and at EAg=-588mV were carried out. The corrosion product mophology was examined. The results show that the addition of 5wt% CeC1_3 greatly decreased the corrosion rate, changed the morphology of corrosion products,and significantly improved hot corrosion resistance of alloy HK40,due to precipitation of cerium oxide on the surface as a promotor for the formation of protective Cr-rich oxide.

Received: 25 February 1992

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Wu Weitao; Niu Yah; and Zhang Jianqing (Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals;Academia Sinica). EFFECT OF RARE EARTH ADDITIONS TO THE MELT ON HOT CORROSION RESISTANCE OF ALLOY HK40. J Chin Soc Corr Pro, 1992, 12(1): 27-33.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I1/27

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