COMPARATIVE-STUDY OF THE PASSIVITY AND THE BREAKDOWN OF PASSIVITY OF POLYCRYSTALLINE IRON IN DIFFERENT ALKALINE-SOLUTIONS

被引：39

作者：

ALBANI, OA ^{[1
]}

GASSA, LM ^{[1
]}

ZERBINO, JO ^{[1
]}

VILCHE, JR ^{[1
]}

ARVIA, AJ ^{[1
]}

机构：

[1] NATL UNIV LA PLATA,FAC CIENCIAS EXACTAS,INST INVEST FISICOQUIM TEOR & APLICADAS,RA-1900 LA PLATA,ARGENTINA

来源：

ELECTROCHIMICA ACTA | 1990年 / 35卷 / 09期

关键词：

composite passive iron layer structure; ellipsometry of passive iron layers; influence of Cl[!sup]-[!/sup] ions on passive iron; iron in saturated Ca(OH)[!sub]2[!/sub] solutions; passivity breakdown; passivity of iron;

D O I：

10.1016/0013-4686(90)85018-I

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The passivity and passivity breakdown of polycrystalline iron is investigated through electrochemical methods complemented with ellipsometry, by employing plain 0.04 M NaOH and saturated Ca(OH)2 solutions with the addition of chloride salt of concentrations up to 1 M. The comparative results indicate that the initial reactions of Fe(OH)2 formation at the inner part of the passive layer level (Fe3O4) are only slightly influenced by either the cation or the presence of Cl- ion in solution, in contrast to their large influence at the outer part of the passive layer (hydrous FeOOH species) where Fe2+/Fe3+ redox reactions take place. At high positive potential the breakdown of passivity is also influenced by both Cl- ion and cation present in solution. © 1990.

引用

页码：1437 / 1444

页数：8

共 49 条

[1] Akolzin A. P., 1984, Journal of the Electrochemical Society of India, V33, P177
[2] AKOLZIN AP, 1985, BR CORROS J, V20, P1
[3] ALBANI OA, 1986, ELECTROCHIM ACTA, V11, P1403
[4] THE MECHANISM OF PITTING OF HIGH-PURITY IRON IN NACL SOLUTIONS
ALVAREZ, MG
GALVELE, JR
[J]. CORROSION SCIENCE, 1984, 24 (01) : 27 - &
[5] Aspnes D.E, 1985, HDB OPTICAL CONSTANT, V1, P89, DOI 10.1016/B978-0-08-054721-3.50010-1
[6] BOCKRIS JO, 1970, S FARADAY SOC, V4, P177
[7] RAMAN-SPECTROSCOPY OF OXIDE LAYERS ON PURE IRON IN ELECTROCHEMICAL ENVIRONMENT
DUNNWALD, J
OTTO, A
[J]. FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1984, 319 (6-7): : 738 - 742
[8] Dunnwald J., 1983, PASSIVITY METALS SEM
[9] Froelicher M., 1983, Passivity of Metals and Semiconductors. Proceedings of the 5th International Symposium, P85
[10] Froelicher M., 1983, Passivity of Metals and Semiconductors. Proceedings of the 5th International Symposium, P101

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