A photoelectrochemical investigation of conversion coatings on Mg substrates

被引：78

作者：

Anicai, L

Masi, R

Santamaria, M

Di Quarto, F

机构：

[1] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy

[2] Petromserv SA, Dept Environm Protect & Technol Dev, Bucharest, Romania

来源：

CORROSION SCIENCE | 2005年 / 47卷 / 12期

关键词：

conversion coating; Mg; mixed hydroxide; photocurrent spectroscopy;

D O I：

10.1016/j.corsci.2005.05.033

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The structure, morphology and composition of conversion coatings grown in stannate bath on pure Mg were studied using potential-time, polarization curves, X-ray diffraction, scanning electron microscopy and photocurrent spectroscopy. The coating is manly constituted by crystalline magnesium-tin hydroxide, whose morphology and distribution depends on the conversion bath composition and temperature. The photoelectrochemical investigation allowed to estimate the band gap value of MgSn(OH)(6) and flat band potential. A sketch of the metal/passive film/electrolyte junction formed during conversion on the metal substrate is reported to account for the overall photoelectrochemical behaviour. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2883 / 2900

页数：18

共 21 条

[1]

The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions [J].