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首页> 外文期刊>Journal of Materials Engineering and Performance >Chemical Corrosion of Liquid-Phase Sintered SiC in Acidic/Alkaline Solutions Part 1. Corrosion in HNO3 Solution
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Chemical Corrosion of Liquid-Phase Sintered SiC in Acidic/Alkaline Solutions Part 1. Corrosion in HNO3 Solution

机译：液相烧结SiC在酸性/碱性溶液中的化学腐蚀第1部分。在HNO3溶液中的腐蚀

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摘要

The corrosion behavior of the liquid-phase sintered SiC (LPS-SiC) was studied by dipping in 3.53 mol/L HNO3 aqueous solution at room temperature and 70 A degrees C, respectively. The weight loss, strength reduction and morphology evolution of the SiC specimens during corroding were revealed and also the chemical corrosion process and mechanism of the SiC specimens in the acidic solution were clarified. The results show that the corrosion of the LPS-SiC specimens in the HNO3 solution is selective. The SiC particles are almost free from corrosion, but the secondary phases of BaAl2Si2O8 (BAS) and Y2Si2O7 are corroded via an acid-alkali neutralization reaction. BAS has a higher corrosion rate than Y2Si2O7, resulting in the formation of the bamboo-leaf-like corrosion pits. As the SiC specimens etched in the HNO3 solution at room temperature for 75 days, about 80 mu m thickness corrosion layer forms. The weight loss and bending strength reduction of the etched SiC specimens are 2.6 mg/cm(2) and 52%, respectively. The corrosion of the SiC specimens is accelerated in the 70 A degrees C HNO3 solution with a rate about five times bigger than that in the same corrosion medium at room temperature.
机译：通过在室温和70 A的温度下分别浸入3.53 mol / L HNO3水溶液中研究了液相烧结SiC（LPS-SiC）的腐蚀行为。揭示了碳化硅试样在腐蚀过程中的失重，强度降低和形貌演变，并阐明了碳化硅试样在酸性溶液中的化学腐蚀过程和机理。结果表明，LPS-SiC试样在HNO3溶液中的腐蚀具有选择性。 SiC颗粒几乎没有腐蚀，但是BaAl2Si2O8（BAS）和Y2Si2O7的次级相通过酸碱中和反应被腐蚀。 BAS的腐蚀速率高于Y2Si2O7，导致形成了竹叶状腐蚀坑。当SiC样品在HNO3溶液中于室温下腐蚀75天时，形成约80微米厚的腐蚀层。蚀刻的SiC样品的重量损失和弯曲强度降低分别为2.6 mg / cm（2）和52％。在70 A的HNO3溶液中，SiC样品的腐蚀速率比室温下相同腐蚀介质中的腐蚀速率快约五倍。

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