Organo-silane coatings for AZ31 magnesium alloy corrosion protection
Organo-silane coatings for AZ31 magnesium alloy corrosion protection
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DOI：
10.1016/j.matchemphys.2008.02.015
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发表时间：
2008-08
影响因子：
4.6
通讯作者：
F. Zucchi;A. Frignani;V. Grassi;A. Balbo;G. Trabanelli
中科院分区：
文献类型：
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作者：
F. Zucchi;A. Frignani;V. Grassi;A. Balbo;G. Trabanelli
采用电化学方法研究了长烷基有机硅烷在AZ31镁合金表面形成的涂层的保护性能。涂层在辛基或十八烷基三甲氧基硅烷的水醇浴中形成，并在不同pH值下水解。在所有pH值下由较低同系物形成的涂层总是多孔的，几乎没有保护性。由较高同系物构建的那些更耐腐蚀，并且当十八烷基三甲氧基硅烷在pH 5下水解时观察到最好的结果：在这种情况下，形成厚的几乎没有缺陷的层，并且在0.05M Na2SO4溶液中浸泡1000h后没有观察到明显的腐蚀攻击。
The protective performances of coatings formed by organo-silanes with a long alkyl chain for AZ31 magnesium alloy corrosion protection were evaluated by electrochemical techniques. The coatings were formed in hydroalcoholic baths of octyl- or octadecyl-trimethoxy-silane, and hydrolyzed at different pH values. The coatings formed at all the pH by the lower homologue were always porous and scarcely protective. Those built by the higher homologue were more corrosion resistant and the best results were observed when octadecyl-trimethoxy-silane was hydrolyzed at pH 5: in this case a thick, scarcely defective, layer was formed and no evident corrosion attack was observed after 1000h immersion in 0.05M Na2SO4solution.