AES ANALYSIS OF THE SURFACE FILMS FORMED ON ALLOY800M IN HOT CONCENTRATED CAUSTIC SOLUTION

J Chin Soc Corr Pro

2003, Vol. 23

Issue (5): 266-270 DOI:

Research Report

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AES ANALYSIS OF THE SURFACE FILMS FORMED ON ALLOY800M IN HOT CONCENTRATED CAUSTIC SOLUTION

Chunbo Huang;Zhanpeng Lv;Wu Yang

上海材料研究所

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Abstract The surface films formed on modified alloy 800(all oy 800M)polarized potentiostatically at different potentials in boiling 50%NaOH +0.3%SiO2+0.3%Na2S2O3 solution for two hours were analyzed by means of A uger electron spectroscopy(AES).At the potentials between -500 mV and 80 mV ,the enrichment factor of Ni was an order of magnitude higher than that of Fe and Cr in the surface films.General intergranular attack(IGA)at -500 mV occurred due to S enrichment and Cr depletion in the surface films.The curves of enrichment factor vs.potential had a critical potential(Ecr=-40 mV)where the al loy suffered from IGA due to the dissolution of active grain boundaries when str ess ruptured the surface film whose protective ability decreased by the transfor mation of Ni(OH)2 into a new unstable oxide of xNi2+yNi3+O y(OH)2x+y.At E=-30 mV～40 mV,intergranular stress corrosion cracking (IGSCC)was attributed to the formation of xNi2+yNi3+Oy·(O H) 2x+y and the percentage of active grain boundaries over a critical percentag e.

Key words: alloy 800M hot concentrated caustic solution AES enr ichment factor IGA critical potential

Received: 13 May 2002

ZTFLH:

TG192.9

Corresponding Authors: Chunbo Huang E-mail: huangcb@eastday.com

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Chunbo Huang; Zhanpeng Lv; Wu Yang. AES ANALYSIS OF THE SURFACE FILMS FORMED ON ALLOY800M IN HOT CONCENTRATED CAUSTIC SOLUTION. J Chin Soc Corr Pro, 2003, 23(5): 266-270 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I5/266

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