一、引言国内采用不对称直流镀铁工艺修复汽车另件,目前正在逐步推广,这是因为镀铁工艺具有加工方便、又不会改变机械尺寸的优点。但在生产过程中,还存在一系列的问题,急待解决。首先是此工艺只适于电镀几何图形不复杂的园形材料,若用于电镀汽车曲轴时,会产生“胖肚、沟槽、锥形”等现象。原因是所用氯化亚铁镀液分散度低所造成。其次是此镀液酸度过高,在电镀过程中,不少的电流耗于还原氢离子去了,而在 I. INTRODUCTION Domestic use of asymmetric DC plating iron repair car parts, is being gradually promoted, this is because the iron plating process with the processing convenience, but will not change the mechanical size of the advantages. However, in the production process, there are still a series of problems that need to be solved urgently. The first is that this process is only suitable for electroplating geometrical uncomplicated garden material, if used for plating automobile crankshaft, it will produce “fat belly, groove, cone” and so on. The reason is due to the low dispersion of ferrous chloride plating solution. Followed by the acidity of the plating solution is too high, in the plating process, a lot of current consumption to reduce hydrogen ions to go, and in