Self-healing mechanism of a protective film prepared on a Ce(NO3)3-pretreated zinc electrode by modification with Zn(NO3)2 and Na3PO4
Self-healing mechanism of a protective film prepared on a Ce(NO3)3-pretreated zinc electrode by modification with Zn(NO3)2 and Na3PO4
复制标题
DOI：
10.1016/s0010-938x(02)00153-1
复制
发表时间：
2003-05
影响因子：
8.3
通讯作者：
K. Aramaki
中科院分区：
文献类型：
--
作者：
K. Aramaki
用极化曲线、X射线光电子能谱（XPS）和电子探针（EPMA）研究了锌在0.5M NaCl溶液中划痕处的自修复机理。通过在Ce（NO3）3溶液中处理并加入含有9.98或19.9 μg/cm 2 Zn（NO3）2·6 H2O和55.2 μg/cm 2 Na 3 PO 4·12 H2O的水溶液在锌电极上制备膜。在涂覆的电极用刀刃刮刀刮擦并在NaCl溶液中浸泡许多小时后，进行极化测量、观察划痕处的凹坑形成、XPS和EPMA。该膜对划伤电极上的锌腐蚀具有显著的保护和自修复作用。除划痕表面有一层含有少量Ce 4+的Ce 2 O3薄层和划痕表面有一层主要由Zn 3（PO 4）2·4 H2O、Zn（OH）2和ZnO组成的层外，表面覆盖明显抑制了锌腐蚀的阴极和阳极过程。
Self-healing mechanism of a protective film against corrosion of zinc at scratches in an aerated 0.5 M NaCl solution was investigated by polarization measurements, X-ray photoelectron spectroscopy (XPS) and electron-probe microanalysis (EPMA). The film was prepared on a zinc electrode by treatment in a Ce(NO3)3solution and addition of aqueous solutions containing 9.98 or 19.9 μg/cm2of Zn(NO3)2·6H2O and 55.2 μg/cm2of Na3PO4·12H2O. After the coated electrode was scratched with a knife-edge crosswise and immersed in the NaCl solution for many hours, polarization measurements, observation of pit formation at the scratches, XPS and EPMA were carried out. This film was remarkably protective and self-healing against zinc corrosion on the scratched electrode. The cathodic and anodic processes of zinc corrosion were markedly suppressed by coverage of the surface except for scratches with a thin Ce2O3layer containing a small amount of Ce4+and the surface of scratches with a layer composed of Zn3(PO4)2·4H2O, Zn(OH)2and ZnO mostly.