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采用直流或不对称交直流电镀电源获得的低温镀铁层有明显的纵横向裂纹(图1、图2),这是人所共知的。裂纹的产生是由于在大电流密度下电沉积,贮存在电沉积过程中的高能量以残余应力的形式释放,把沉积的金属层拉成很多碎块所致,这就使低温镀镀层的应用受到局限。作者试图采用可调周期换向脉冲电镀电源,在低温镀镀中获得低裂纹铁层,以期提高镀层耐磨性。本报告仅对微观结晶形貌观察方面提出论据。
It is well-known that low-temperature iron coatings obtained by direct current or asymmetric AC-DC power supply have significant longitudinal and transverse cracks (Figure 1 and Figure 2). Cracking occurs due to electrodeposition at high current densities, the release of high energy stored in the electrodeposition process in the form of residual stresses, and the pulling of the deposited metal layer into many pieces resulting in the use of low temperature plating Limited. The author attempts to use the adjustable periodic commutation pulse plating power to obtain the low cracked iron layer in low temperature plating, in order to improve the wear resistance of the coating. This report presents only evidence of microscopic crystalline morphology.