通过酸洗、浸泡法和电化学腐蚀测试分析了烧结Nd Fe B永磁体在不同浓度的H2SO4溶液、HCl溶液和HNO3溶液中的腐蚀行为。结果表明,烧结Nd Fe B磁体在HNO3溶液中的腐蚀机制为均匀腐蚀,而在H2SO4溶液和HCl溶液中的腐蚀机制为选择性的晶间腐...通过酸洗、浸泡法和电化学腐蚀测试分析了烧结Nd Fe B永磁体在不同浓度的H2SO4溶液、HCl溶液和HNO3溶液中的腐蚀行为。结果表明,烧结Nd Fe B磁体在HNO3溶液中的腐蚀机制为均匀腐蚀,而在H2SO4溶液和HCl溶液中的腐蚀机制为选择性的晶间腐蚀。烧结Nd Fe B磁体在酸溶液中的腐蚀速率随着酸溶液浓度的增加而增加。在浸泡试验和电化学腐蚀试验中,烧结Nd Fe B磁体在HNO3溶液中的腐蚀速率均最小。因此,HNO3溶液更适合作为烧结Nd Fe B磁体的酸洗液。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
基金National Science and Technology Key Support Projects of China(2012BAE02B01)Major Science and Technology Special Projects of Jiangxi Province(2010AZX00200)+1 种基金Science and Technology Plan Projects of Jiangxi Province(20121BBE50001)Science and Technology Plan Projects of Department of Education of Jiangxi Province(KJ201109132281)
文摘通过酸洗、浸泡法和电化学腐蚀测试分析了烧结Nd Fe B永磁体在不同浓度的H2SO4溶液、HCl溶液和HNO3溶液中的腐蚀行为。结果表明,烧结Nd Fe B磁体在HNO3溶液中的腐蚀机制为均匀腐蚀,而在H2SO4溶液和HCl溶液中的腐蚀机制为选择性的晶间腐蚀。烧结Nd Fe B磁体在酸溶液中的腐蚀速率随着酸溶液浓度的增加而增加。在浸泡试验和电化学腐蚀试验中,烧结Nd Fe B磁体在HNO3溶液中的腐蚀速率均最小。因此,HNO3溶液更适合作为烧结Nd Fe B磁体的酸洗液。
基金supported by the National Natural Science Foundation of China (Nos. 52071278, 51827801)the National Key Research and Development Program of China (No. 2018YFA0703603)。
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℃.
基金Project(52074048) supported by the National Natural Science Foundation of ChinaProject(2011DA105287-MS202122) supported by the State Key Laboratory of Coal Mine Disaster Dynamics and Control,ChinaProject(CSTB2022NSCQMSX0914) supported by the Chongqing Natural Science Foundation,China。
