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进行了低气压下直流阴极弧斑等离子体去除钢铁表面氧化层(除鳞)的实验研究,利用高速相机和示波器对放电过程进行了诊断。实验表明,阴极弧斑在样品表面快速随机运动。由于弧斑具有极高的电流密度,产生的局部高温使阴极弧斑下方的氧化层被瞬间蒸发、分解。除鳞后样品表面X射线衍射和扫描电镜分析表明,弧斑等离子体能有效地除去钢铁表面氧化层。放电电流是决定除鳞快慢的一个重要参数,单位时间除鳞的面积随放电电流的增大而增加,呈现线性关系,这与依据非静态爆裂ecton模型给出的分析结果相符合。
The experimental research on the removal of oxide layer (descaling) on steel surface by DC cathode arc spot plasma under low pressure was carried out. The discharge process was diagnosed by high-speed camera and oscilloscope. Experiments show that the cathode arc spot in the sample surface rapid random movement. As the arc spot has a very high current density, the resulting local high temperature so that the oxide layer below the cathode arc spot is instantaneous evaporation, decomposition. X-ray diffraction and scanning electron microscopy analysis of the sample after descaling show that the arc spot plasma can effectively remove the oxide layer on the steel surface. The discharge current is an important parameter that determines the speed of descaling. The area of descaling per unit time increases with the increase of discharge current, which shows a linear relationship, which agrees with the analysis results based on the non-static ecton model.