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根据有关的热力学数据和Criss、Cobble提出的熵对应原理计算了Sb—H_2O体系在100、150、200℃下的电位—pH图。计算结果表明,随温度升高Sb的稳定性区域稍有缩小,特别是在高pH值的部份有同较低电位和较小PH值方向移动的趋势,在SbO_2~-,SbO_3~-区域扩大的同时Sb_2O_3,Sb_2O_5的稳定区域亦缩小。这是由于随温度上升,这些离子稳定性增加的缘故。最后,依照电位—pH图对钢铁表面上Sb涂层的腐蚀与保护条件进行了初步探讨。
Based on the relevant thermodynamic data and the principle of entropy correspondence proposed by Criss and Cobble, the potential-pH diagram of Sb-H 2 O system at 100, 150 and 200 ℃ was calculated. The calculated results show that the stability of Sb decreases slightly with the increase of temperature, especially in the part of high pH with the lower potential and smaller PH value. In the region of SbO_2 ~ -, SbO_3 ~ - At the same time, the stability of Sb_2O_3 and Sb_2O_5 is also reduced. This is due to the increased stability of these ions as the temperature rises. Finally, the corrosion and protection conditions of Sb coating on the surface of steel were discussed according to the potential-pH diagram.