Using contrast and orthogonal experiment methods , the effect of electrolyte formulae for varied concentration of cr03 and technology of chromium plating on coating property was studied systematically in this paper . primary factors and their interrelations , which influence the brightness of coating , the current efficiency , dispersion ability and sedimentation velocity of electrolyte were discovered 本文采用对比试验和正交试验等方法系统地研究了低、中、高三种不同铬酐浓度的镀铬液组成和镀铬工艺对镀铬层性能的影响，找到了影响镀层光亮度、镀液电流效率、分散能力和沉积速度的主要因素及其相互关系。
( i ) in the procession of preparing na2feo4 by electrolyzing and oxidizing anodic iron in the high concentration solution of naoh , the current efficiency is directly proportional to both of the temperature and the alkaline concentration of the anolyte , and the growth rate of the na2feo4 concentration of anolyte is directly proportional to both of the electrolyzing speed and the alkaline concentration of anolyte . , 主要结论如下： ( 1 )在浓naoh溶液中直流电解氧化铁阳极生成na _ 2feo _ 4溶液的过程中，电解液温度、阳极液碱浓度与电流效率成正函数关系；电解速度、阳极液碱浓度与阳极液中na _ 2feo _ 4浓度的增长速度成正函数关系。
Current density and electroplating velocity has line relation , but the increscent multiple of electroplating velocity is smaller than that of current density . which indicate that current efficiency decreases with the increase of current density at alcb + lialh4 system . at l - 5a / dm aluminum coating is dense and uniform , especially at 2 . 5a / dm 电流密度与电镀速度两者近似成直线关系，但电镀速度增大的倍数比电流密度增大的倍数要小，说明在alcl _ 3 + lialh _ 4体系中随着电流密度的提高，电流效率逐渐降低。
According the key factors we find , we bring forward a new conception : multilevel suppressor and design a new high performance suppressor whose ion - exchange membrane has bigger areas and using three electrodes including one cathode ( anode ) and two anodes ( cathode ) , at the same time we fill the suppression compartment with one kind of ion exchange resin which has moderate exchange capacity . according to our experiment ' s results , we find the new type suppressor has quite high working current efficiency and suppressing capacity . in most cases , the suppressor ' s current efficiency is over 90 % ; the suppressor can transform the naoh ( concentration : 200mmol / l , flow rate : i . oml / min , conductance : over 10000 i - i s cm " ) to pure water ( conductance : 8 . 9 it s cm in chapter 3 , the high performance suppressor is applied in determination some trace - amounts ions in plating solution , sewage . in this chapter , we also have a research on the gradient ion chromatography 第二章首先以xyz - 1型电化学抑制柱为例，分析了电化学抑制柱的抑制过程得出影响抑制容量的主要因素主要是抑制柱的电流效率和离子交换膜的极限电流密度，因此采用中等交换能力的离子交换树脂作为抑制室的填料以提高电流效率，在通常情况下电流效率可达到90以上；在选用同种离子交换膜的前提下，可通过增加离子交换膜的有效面积达到提高极限电流的目的从而提高抑制柱的抑制容量，因此提出了多级抑制的概念并据此研制了共电极式高容量电化学抑制柱，该抑制柱最高可将流速为1 . 0ml / min ，浓度为200mmol / l电导率超过10000 s ? cm ~ ( - 1 )氢氧化钠溶液抑制为电导率低至8 . 9 s ? cm ~ ( - 1 )的纯水，并且具有稳定性高、分析结果准确等优点。
