A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analy...A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analysis(TG-DTA),X-ray diffraction(XRD),transmissi on electron microscopy(TEM).Using the sintered samples as solid electrolyte a nd silver-palladium alloy as electrodes,electrical conductivities under differ ent gas ambiences at intermediate temperature(400～600℃)were measured. In moist hydrogen atmosphere,the conduction is a little higher than that of dry hydrogen atmosphere.In hydrogen atmosphere,proton conduction may predominate ,leading to an increase in conductivity and a decrease in activation energy.展开更多
用极化曲线和交流阻抗技术测定了钢在含不同浓度甲基红的 1.0 mol/ L HCl和 0 .5 m ol/ L H2 SO4+0 .5 mol/ L Na2 SO4溶液中的腐蚀速率和传递电阻 ,求出了缓蚀效率。结果表明 ,甲基红无论是在 HCl溶液中或是在0 .5 mol/ L H2 SO4+0 .5 ...用极化曲线和交流阻抗技术测定了钢在含不同浓度甲基红的 1.0 mol/ L HCl和 0 .5 m ol/ L H2 SO4+0 .5 mol/ L Na2 SO4溶液中的腐蚀速率和传递电阻 ,求出了缓蚀效率。结果表明 ,甲基红无论是在 HCl溶液中或是在0 .5 mol/ L H2 SO4+0 .5 mol/ L Na2展开更多
The corrosion rate and interface capacity of steel in 0.5mol/L H 2SO 4+0 5mol/L Na 2SO 4 solution containing methyl red were measured by curve-fitting method of polarization data and Ac impedance technique at 20℃.The...The corrosion rate and interface capacity of steel in 0.5mol/L H 2SO 4+0 5mol/L Na 2SO 4 solution containing methyl red were measured by curve-fitting method of polarization data and Ac impedance technique at 20℃.The degree of coverage of methyl red on steel surface was calculated.The degree of coverage was found to increase with the increasing of concentration of methyl red.The experimental data were treated with adsorption kinetic theory,too.It was found that adsorption of methyl red on steel surface in the acidic solutions was a substitution adsorption process and one water molecule was displaced by each adsorbed methyl molecule.The experimental result shows that at 20℃ the adsorption behavior follows the isotherm θ/ =1/55.5exp[27808-972 θ)/RT ].The ideal surface adsorption free energy was calculated.The interface capacity of steel decreases with the increasing of the degree of surface coverage in acidic solutions at 20℃.展开更多
文摘A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analysis(TG-DTA),X-ray diffraction(XRD),transmissi on electron microscopy(TEM).Using the sintered samples as solid electrolyte a nd silver-palladium alloy as electrodes,electrical conductivities under differ ent gas ambiences at intermediate temperature(400～600℃)were measured. In moist hydrogen atmosphere,the conduction is a little higher than that of dry hydrogen atmosphere.In hydrogen atmosphere,proton conduction may predominate ,leading to an increase in conductivity and a decrease in activation energy.
文摘用极化曲线和交流阻抗技术测定了钢在含不同浓度甲基红的 1.0 mol/ L HCl和 0 .5 m ol/ L H2 SO4+0 .5 mol/ L Na2 SO4溶液中的腐蚀速率和传递电阻 ,求出了缓蚀效率。结果表明 ,甲基红无论是在 HCl溶液中或是在0 .5 mol/ L H2 SO4+0 .5 mol/ L Na2
文摘The corrosion rate and interface capacity of steel in 0.5mol/L H 2SO 4+0 5mol/L Na 2SO 4 solution containing methyl red were measured by curve-fitting method of polarization data and Ac impedance technique at 20℃.The degree of coverage of methyl red on steel surface was calculated.The degree of coverage was found to increase with the increasing of concentration of methyl red.The experimental data were treated with adsorption kinetic theory,too.It was found that adsorption of methyl red on steel surface in the acidic solutions was a substitution adsorption process and one water molecule was displaced by each adsorbed methyl molecule.The experimental result shows that at 20℃ the adsorption behavior follows the isotherm θ/ =1/55.5exp[27808-972 θ)/RT ].The ideal surface adsorption free energy was calculated.The interface capacity of steel decreases with the increasing of the degree of surface coverage in acidic solutions at 20℃.
