Improving the corrosion resistance of sol-gel-derived aluminoborosilicate glass coatings by nitridation
Improving the corrosion resistance of sol-gel-derived aluminoborosilicate glass coatings by nitridation
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DOI：
10.1016/j.jnoncrysol.2016.06.016
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发表时间：
2016-09
影响因子：
3.5
通讯作者：
Ksenia Shandarova;G. Helsch;J. Deubener;W. Dziony;L. Wondraczek
中科院分区：
文献类型：
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作者：
Ksenia Shandarova;G. Helsch;J. Deubener;W. Dziony;L. Wondraczek
耐化学腐蚀，特别是耐碱侵蚀，仍然是氧化物玻璃成分设计中的一大挑战。本文以溶胶-凝胶法制备的铝硼硅酸盐玻璃为模型体系，研究了热氮化对氧化物玻璃腐蚀的影响。薄膜玻璃的氮化是通过在热氨气流中进行反应处理实现的。表面化学分析表明，氮离子进入了玻璃结构。由于键密度的增加，这导致了氮化区表面硬度的增加，但也显著降低了在碱性溶液中处理的腐蚀速度。结果表明，由于氮对Sisingle键N键的偏好，耐碱性的提高似乎依赖于母玻璃的SiO_2含量。由于铝硅酸盐玻璃中硅含量较高(~21at.%)，氮化时的腐蚀动力学有较强的减慢作用。
The resistance to chemical corrosion, in particular, alkali attack, remains a major challenge in the design of oxide glass compositions. Using a sol-gel-derived aluminoborosilicate glass as a model system, here, we report on the effect of thermal nitridation on corrosion of oxide glasses. Nitridation of thin-film glasses is achieved by reactive treatment in a hot ammonia gas flow. Surface chemical analyses reveal the incorporation of nitrogen anions into the glass structure. Due to the increase in bond density, this results in increasing surface hardness of the nitrated region, but also in a significantly reduced corrosion rate for treatment in alkaline solutions. It is found that the improvement in the alkali resistance seems to depend on the silica content of the parent glass due to the preferences of nitrogen for Sisingle bondN bonds. As the silicon content is higher (~ 21 at.%) than in previously studied aluminosilicate glasses, a stronger slow-down of the corrosion kinetics upon nitridation is observed.