改性800M合金在热浓碱溶液中生成的表面膜的AES研究

中国腐蚀与防护学报

2003, Vol. 23

Issue (5): 266-270

研究报告

本期目录 | 过刊浏览

改性800M合金在热浓碱溶液中生成的表面膜的AES研究

黄春波;吕战鹏;杨武

上海材料研究所

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

全文: PDF(161 KB)

摘要: 对改性800合金(800M)在沸腾的50%NaOH+03%SiO2+03%Na2S2O3溶液中不同电位下恒电位极化2 h后的表面膜进行了俄歇电子能谱(AES)分析，发现在所选择的电位条件下(-500 mV～80 mV)，表面膜中Ni的富集因子比Fe、Cr的大一个数量级，表面膜富Ni而贫Fe、Cr.在-500 mV，800M合金C形环试样发生晶间腐蚀(IGA)是由于表面膜中S富集、Cr的相对百分含量很低，S2-在晶界偏析及晶界形成严重贫铬区.富集因子随电位的变化曲线有一拐点电位(Ecr=-40 mV).在-40 mV时，C形环试样发生IGA是由于生成不稳定的Ni的氧化产物xNi2+yNi3+Oy(OH)2x+y，表面膜保护性能下降，应力撕破表面膜，活性晶界优先发生溶解形成的.在-30 mV～40 mV时，C形环试样发生沿晶应力腐蚀破裂( IGSCC)则可能是由于xNi2+yNi3+Oy(OH) 2x+y不稳定，活性晶界分数大于裂纹扩展所需临界分数的缘故.

关键词 ： 800M合金, 热浓碱溶液, AES, 富集因子, IGA, 拐

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

收稿日期: 2002-05-13

ZTFLH:

TG192.9

通讯作者: 黄春波 E-mail: huangcb@eastday.com

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

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引用本文:

黄春波; 吕战鹏; 杨武 . 改性800M合金在热浓碱溶液中生成的表面膜的AES研究[J]. 中国腐蚀与防护学报, 2003, 23(5): 266-270 .
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/CN/ 或 https://www.jcscp.org/CN/Y2003/V23/I5/266

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