【摘要】 以由主盐FeSO4.7H2O,Pd(NH3)2Cl2和导电盐(NH4)2SO4所组成的溶液体系为研究对象,基于溶液各组成同时处于平衡的热力学原理,通过对Fe-H2O系、Pd-H2O系和Fe-NH4+-H2O系三种体系的热力学分析与计算及其电位-pH图的绘制与分析,对电沉积Pd-Fe合金的溶液进行了较为系统的热力学分析。对三者的电位-pH图进行比较分析的结果表明:Pd2+和Fe2+发生共沉积的区域很大,为Pd-Fe合金发生共沉积的可能性提供了理论依据;在简单的Pd2+和Fe2+水溶液中,二者很难发生共沉积,必须在镀液中添加一定量合适的络合剂才能使Pd2+和Fe2+产生共沉积;由于在Fe-NH4+-H2O系中存在Fe2+与NH3和OH-的络合,使游离Fe2+的浓度变小,其电位-pH图中的腐蚀区域比Fe-H2O系电位-pH图的腐蚀区域稍有扩大,且其腐蚀区中含有Fe2+,∑i=1,2,4Fe(NH3)2+i和∑4Fe(NH3)i2+和∑Fe(OH)j2-j三类水溶物。更多还原

【Abstract】 The system of electrolyte solution made up of main salts FeSO₄·7H₂O,Pd（NH₃）₂Cl₂ and the conductive salt（NH₄）₂SO₄ was studied.With the thermodynamic analysis and E-pH diagrams for Fe-H₂O,Pd-H₂O and Fe-NH₄⁺-H₂O,the thermodynamic analysis for electrodepositing Fe-Pd alloy from the solution was systemically carried out.Three E-pH diagrams show that the co-depositing region of Pd²⁺ and Fe²⁺ is very wide.It supports theoretically the possibility of electrodepositing Pd-Fe alloy.But it is quite difficult to co-deposit in a simple solution of Pd²⁺ and Fe²⁺.In order to get the co-deposition,an appropriate complexable agent must be added into the solution.Because of the complex reaction between Fe²⁺ and NH₃,OH^-in the Fe-NH₄⁺-H₂O system,the concentration of free Fe²⁺ decreases and the corrosive region in E-pH diagram of the system is slightly wider than that of Fe-H₂O,and the region contains Fe²⁺,i=1,2,4Fe（NH₃）²⁺_i,4j=1Fe（OH）^2-j_j.更多还原