Simulation of natural corrosion by vapor hydration test: seven-year results
Simulation of natural corrosion by vapor hydration test: seven-year results
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通过蒸气水合试验模拟自然腐蚀：七年结果
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Bates
中科院分区：
文献类型：
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作者：
J. S. Luo;W. Ebert;J. Mazer;J. Bates
我们研究了合成玄武岩和SRL 165硼硅酸盐废玻璃在70°C的水蒸气中反应长达7年的蚀变行为。通过光学显微镜、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和能量色散x射线能谱（EDS）对反应玻璃表面进行表征，确定了玻璃腐蚀的性质和程度。70°C实验室测试的变化与150-200°C的变化进行了比较，也与480至750年历史的夏威夷玄武岩玻璃进行了比较，它们的性质发生了细微的变化。合成玄武岩和废玻璃都含有约50%重量的SiO{sub 2}，它们与水蒸气发生反应，形成含有少量粘土的无定形水合凝胶，几乎与在自然蚀变的玄武岩玻璃上形成的palagonite层相同。这一结果表明，可以用蒸汽水化试验来模拟自然界中的腐蚀反应。这些测试还提供了一种测量腐蚀动力学的方法，这很难通过研究自然样品来确定，因为蚀变层经常会使样品消失，而我们对蚀变发生的条件只有有限的了解。
We have investigated the alteration behavior of synthetic basalt and SRL 165 borosilicate waste glasses that had been reacted in water vapor at 70 {degrees}C for time periods up to seven years. The nature and extent of corrosion of glasses have been determined by characterizing the reacted glass surface with optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDS). Alteration in 70 {degrees}C laboratory tests was compared to that which occurs at 150-200 {degrees}C and also with Hawaiian basaltic glasses of 480 to 750 year old subaerially altered in nature. Synthetic basalt and waste glasses, both containing about 50 percent wt SiO{sub 2} were found to react with water vapor to form an amorphous hydrated gel that contained small amounts of clay, nearly identical to palagonite layers formed on naturally altered basaltic glass. This result implies that the corrosion reaction in nature can be simulated with a vapor hydration test. These tests also provide a means for measuring the corrosion kinetics, which are difficult to determine by studying natural samples because alteration layers have often spelled off the samples and we have only limited knowledge of the conditions under which alteration occurred.