镁合金微弧氧化膜的SiO<sub>2</sub>溶胶封孔处理研究

蔡启舟; 王栋; 骆海贺; 魏伯康

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镁合金微弧氧化膜的SiO₂溶胶封孔处理研究
Sealing of Micro-arc Oxidation Coating on Magnesium Alloy by SiO₂ Sol Sealing Agent
2006年第10期页码：612-614
纸质出版日期： 2006 ，
DOI：

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[1]蔡启舟,王栋,骆海贺,魏伯康.镁合金微弧氧化膜的SiO_2溶胶封孔处理研究[J].特种铸造及有色合金,2006(10):612-614+603.

Cai Qizhou, Wang Dong, Luo Haihe, et al. Sealing of Micro-arc Oxidation Coating on Magnesium Alloy by SiO₂ Sol Sealing Agent[J]. Special Casting & Nonferrous Alloys, 2006,(10):612-614.
[1]蔡启舟,王栋,骆海贺,魏伯康.镁合金微弧氧化膜的SiO_2溶胶封孔处理研究[J].特种铸造及有色合金,2006(10):612-614+603. DOI：

Cai Qizhou, Wang Dong, Luo Haihe, et al. Sealing of Micro-arc Oxidation Coating on Magnesium Alloy by SiO₂ Sol Sealing Agent[J]. Special Casting & Nonferrous Alloys, 2006,(10):612-614. DOI：

摘要

以正硅酸乙酯为原料

乙醇为溶剂

盐酸为催化剂制备了SiO2溶胶封孔剂。该封孔剂的傅立叶红外光谱（FTIR）中含有Si-O-Si键的伸缩振动吸收峰

证明了SiO2微粒存在

而且干凝胶的Si-O-Si键的伸缩振动吸收峰强度不随热处理温度的变化而变化

表明封孔剂有良好的高温稳定性。SiO2溶胶封孔剂可浸入镁合金微弧氧化膜的微孔

形成有效封孔。封孔处理可使镁合金微弧氧化试样的腐蚀速率由106mg/（m2.h）降至32mg/（m2.h）

而且封孔处理还可显著提高镁合金微弧氧化试样在410℃下的抗氧化性能

对镁合金基体有很好的保护作用。

Abstract

SiO

sol sealing agent was prepared from tetraethoxysilane（TEOS）by ethyl alcohol as solvent and hydrochloric acid as catalyst.The Fourier transformed infrared spectrometry（FTIR）contains dilation flutter absorption peak of S-O-Si

which shows the presence of SiO

particle in solution.The sealing agent has a great stability at elevated uemperature because the strength of dilation flutter absorption peak of Si-O-Si does not change with heat treatment temperature.It could be observed that the SiO

sol sealing agent fills up the hole of micro-arc oxidation coating on magnesium alloy.The corrosion rate of MAO coating sealed by SiO

sol can be reduced from 106mg/（m2·h）to 32 mg/（m2·h）.Moreover the anti-oxidizing performance of MAO coating at 410 ℃ is greatly improved by sealing

and the coating sealed by SiO

sol offers the effective protection for magnesium alloy substrate.