The corrosion properties of phosphate coating on AZ31 magnesium alloy: The effect of sodium dodecyl sulfate (SDS) as an eco-friendly accelerating agent

被引：104
作者：
Amini, R. [1 ]
Sarabi, A. A. [1 ]
机构：
[1] AmirKabir Univ Technol, Dept Polymer Engn & Color Technol, Tehran, Iran
来源：
APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 16期
关键词：
AZ31 magnesium alloy; Corrosion; Phosphate coating; Polarization; Sodium dodecyl sulfate; CONVERSION FILM; FORMATION MECHANISM; MG-8.8LI ALLOY; AZ91D; RESISTANCE; SURFACE; GROWTH; CERIUM; IMPROVEMENT; PROTECTION;
D O I：
10.1016/j.apsusc.2011.03.072
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Sodium nitrite has been used as an accelerating agent in phosphating bath to improve its properties. However, it is well known that sodium nitrite is a carcinogenic component in phosphating sludge. In this study, it has been aimed to replace sodium nitrite by an environmentally friendly accelerating agent. To this end, sodium dodecyl sulfate (SDS) was used in phosphating bath to improve the phosphate coating formation on an AZ31 magnesium alloy. The effect of SDS/sodium nitrite ratio on the phosphated samples properties was also studied. Using field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), direct current (DC) polarization and electrochemical impedance spectroscopy (EIS) the properties of phosphated magnesium samples were studied. Results showed uniform phosphate coating formation on the magnesium sample mostly in hopeite phase composition. In addition, a denser and less permeable coating can be obtained at these conditions. The corrosion resistance of the phosphated samples was superiorly improved using higher SDS concentration in the phosphating bath. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：7134 / 7139
页数：6
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