直流电低温镀铁工艺,是使用直流小电流密度起镀,逐步过渡到直流大电流密度正镀的方法,以获得有良好结合强度和硬度的铁镀层。实践证明,直流电低温镀铁除具有结合强度大(200～3500公斤/厘米~2)、硬度高(HRC45～50)、沉积速度快(0.4～0.5毫米/小时)、镀层厚(1毫米以上)、镀层组织细密等优点外,与不对称交流一直流电低温镀铁比较,还有电源设备简单、成本低、操作方便等特点,因而它更适用于大型磨损零件的修复。我段于1978年3月开始作直流电低温镀铁工艺的试验。在小型试验的基础上,结合生产需要,选择修换率较大的ND_4型内燃机 DC low-temperature iron plating process, is the use of DC current density from the plating, and gradually transition to the DC current density is positive plating method to obtain a good combination of strength and hardness of the iron coating. Practice has proved that, in addition to DC low temperature iron plating with a combination of strength (200 ~ 3500 kg / cm ~ 2), high hardness (HRC45 ~ 50), deposition speed (0.4 ~ 0.5mm / h), coating thickness (1mm) , The advantages of microstructure and other fine plating, and asymmetric AC DC power has been low-temperature ferrous plating, as well as power equipment is simple, low cost, easy to operate and so on, so it is more suitable for large wear parts repair. I paragraph began in March 1978 for DC low temperature iron plating test. On the basis of small-scale test, combined with the production needs, choose a larger replacement rate ND_4 type internal combustion engine