THE EFFECT OF CALCIUM-IONS ON THE ADSORPTION OF PHOSPHONIC ACID - A COMPARATIVE INVESTIGATION WITH EMPHASIS ON SURFACE ANALYTICAL METHODS

被引：27

作者：

KALMAN, E ^{[1
]}

KARMAN, FH ^{[1
]}

CSERNY, I ^{[1
]}

KOVER, L ^{[1
]}

TELEGDI, J ^{[1
]}

VARGA, D ^{[1
]}

机构：

[1] HUNGARIAN ACAD SCI,INST NUCL RES,H-4001 DEBRECEN,HUNGARY

来源：

ELECTROCHIMICA ACTA | 1994年 / 39卷 / 8-9期

关键词：

INHIBITION; ADSORPTION; PHOSPHONIC ACID; CALCIUM ION; XPS; XAES;

D O I：

10.1016/0013-4686(94)E0034-W

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influence of calcium ions on the adsorption of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) on Fe electrodes has been examined. Surface analytical methods (XPS and XAES) have been applied in order to obtain direct information on the structure of the surface layer. On the surfaces of electropolished samples, various Fe2+, Fe3+ and FeOOH compounds as well as the metallic state of Fe could be identified in the surface layers. HEDP was adsorbed on the iron surface in almost the same extent, when the basic solutions were bidistilled water or 0.5 mol dm-3 NaClO4, respectively. The presence of Ca2+ cations increased the quantity of phosphonate adsorbed on the metal surface considerably. Varying the Ca/HEDP molar ratio in the solution between 0.5 and 4.0, the Ca/HEDP molar ratio on the metal surface remained under a limit close to one, corresponding to what could be expected on the basis of the results obtained by radiotracer method.

引用

页码：1179 / 1182

页数：4

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