Hydrophobic PEO coatings were fabricated in an electrolyte containing potassium stearate.The wetting behaviour of coated samples was studied using dynamic and static contact angle.Also,the corrosion behaviour of the s...Hydrophobic PEO coatings were fabricated in an electrolyte containing potassium stearate.The wetting behaviour of coated samples was studied using dynamic and static contact angle.Also,the corrosion behaviour of the samples was evaluated by polarization method.The dynamic contact angle and hysteresis of the contact angle for PEO coating were evaluated by Wilhelmy plate method.There was an increase in the contact angle of the nanocomposite and traditional PEO coatings when potassium stearate was added to the electrolyte up to 130°.The more hydrophobic coatings,showed more corrosion resistance in 3.5 wt.%NaCl solution.The synergistic effect of potassium stearate and nanoparticles increased the hydrophobicity because of assembling of fatty acid on ceramic powder.展开更多
在298.15~338.15 K 0.1 MPa工况下测定了离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐([emim][Tf_2N])的表面张力、密度、黏度及电导率;采用最小二乘法拟合了实验数据,得到了表面张力和密度随温度的回归方程;在相同工况下,同其他实验...在298.15~338.15 K 0.1 MPa工况下测定了离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐([emim][Tf_2N])的表面张力、密度、黏度及电导率;采用最小二乘法拟合了实验数据,得到了表面张力和密度随温度的回归方程;在相同工况下,同其他实验数据以及采用基团贡献法得到的数据进行了对比;同时,研究了相关物性参数同离子液体结构和温度的关系。研究结果表明:离子液体的表面张力随阳离子取代基碳链长度的增大而减小,随阴离子尺寸的增加而减小;其表面张力和密度随温度的升高均呈线性减小变化;黏度随着温度的升高逐渐降低;电导率随着温度的升高而增大。以上物性的测定和研究,填补了离子液体[emim][Tf_2N]相关物性参数的空白,同时也为该种离子液体的应用,尤其是在吸收式制冷系统中的应用,提供了参考。展开更多
文摘Hydrophobic PEO coatings were fabricated in an electrolyte containing potassium stearate.The wetting behaviour of coated samples was studied using dynamic and static contact angle.Also,the corrosion behaviour of the samples was evaluated by polarization method.The dynamic contact angle and hysteresis of the contact angle for PEO coating were evaluated by Wilhelmy plate method.There was an increase in the contact angle of the nanocomposite and traditional PEO coatings when potassium stearate was added to the electrolyte up to 130°.The more hydrophobic coatings,showed more corrosion resistance in 3.5 wt.%NaCl solution.The synergistic effect of potassium stearate and nanoparticles increased the hydrophobicity because of assembling of fatty acid on ceramic powder.
文摘在298.15~338.15 K 0.1 MPa工况下测定了离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐([emim][Tf_2N])的表面张力、密度、黏度及电导率;采用最小二乘法拟合了实验数据,得到了表面张力和密度随温度的回归方程;在相同工况下,同其他实验数据以及采用基团贡献法得到的数据进行了对比;同时,研究了相关物性参数同离子液体结构和温度的关系。研究结果表明:离子液体的表面张力随阳离子取代基碳链长度的增大而减小,随阴离子尺寸的增加而减小;其表面张力和密度随温度的升高均呈线性减小变化;黏度随着温度的升高逐渐降低;电导率随着温度的升高而增大。以上物性的测定和研究,填补了离子液体[emim][Tf_2N]相关物性参数的空白,同时也为该种离子液体的应用,尤其是在吸收式制冷系统中的应用,提供了参考。
