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镁铝锌钙合金表面复合涂层的耐腐蚀性及磷灰石形成能力

Corrosion Resistance and Apatite-Forming Ability of Composite Coatings formed on Mg-Al-Zn-Ca Alloys.

作者信息

Anawati Anawati, Asoh Hidetaka, Ono Sachiko

机构信息

Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia.

Department of Applied Chemistry, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan.

出版信息

Materials (Basel). 2019 Jul 14;12(14):2262. doi: 10.3390/ma12142262.

Abstract

The properties of composite coatings formed by plasma electrolytic oxidation (PEO) were affected by the alloy composition. The corrosion resistance and apatite-forming ability of PEO coatings formed on Mg-6Al-1Zn-xCa alloys with a variation of Ca content were investigated. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements showed an order magnitude improvement of corrosion resistance in the AZ61 alloy as a result of the coating. A higher enhancement in polarization resistance was obtained in the Mg-6Al-1Zn-1Ca and Mg-6Al-1Zn-2Ca alloys due to thicker coatings were formed as a result of the incorporation of calcium oxide/hydroxide. However, the underlying substrates were more prone to localized corrosion with increasing Ca content. The microstructure investigation revealed an enlargement in precipitates (AlCa, MgCa) sizes with increasing Ca content in the alloys. The growth of larger size precipitates increased the danger to micro galvanic corrosion. Apatite layers were formed on all of the coatings indicating high apatite-forming ability, but the layers formed on the Mg-6Al-1Zn-1Ca and Mg-6Al-1Zn-2Ca alloys contained higher Mg, possibly due to the accumulation of corrosion product, than that on the Mg-6Al-1Zn alloy. The alloying element Ca should be limited to 1 wt.% as the excess tended to degrade the corrosion resistance and apatite-forming ability of the PEO coating.

摘要

通过等离子体电解氧化(PEO)形成的复合涂层的性能受合金成分的影响。研究了在Ca含量变化的Mg-6Al-1Zn-xCa合金上形成的PEO涂层的耐腐蚀性和磷灰石形成能力。动电位极化和电化学阻抗谱(EIS)测量表明,涂层使AZ61合金的耐腐蚀性提高了一个数量级。由于加入氧化钙/氢氧化钙形成了更厚的涂层,Mg-6Al-1Zn-1Ca和Mg-6Al-1Zn-2Ca合金的极化电阻有更高的增强。然而,随着Ca含量的增加,底层基体更容易发生局部腐蚀。微观结构研究表明,合金中Ca含量增加,析出物(AlCa、MgCa)尺寸增大。更大尺寸析出物的生长增加了微电偶腐蚀的风险。所有涂层上都形成了磷灰石层,表明具有高磷灰石形成能力,但Mg-6Al-1Zn-1Ca和Mg-6Al-1Zn-2Ca合金涂层上形成的磷灰石层比Mg-6Al-1Zn合金涂层含有更高的Mg,这可能是由于腐蚀产物的积累。合金元素Ca应限制在1 wt.%,因为过量的Ca往往会降低PEO涂层的耐腐蚀性和磷灰石形成能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/faf5/6678866/6c7e290379bb/materials-12-02262-g001.jpg

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