点状腐蚀 meaning in Chinese

pitting corrosion
tubercular corrosion

Firstly , the basic character of the remote filed eddy current is simulated and analyzed in case of two - dimension axial symmetry which approves the existence of remote filed eddy current phenomenon ; the full circumferential defect model is investigated to approve the feasibility of using the rfec techniques to detect the position and depth of defect ; the pit corrosion 、 circumferential and axial crack models are simulated , and the defect character based on voltage plane polar plot and the changes of phase and amplitude are analyzed to supply the standard for defect reconfiguration
首先,在二维轴对称情况下仿真与分析了远场涡流的基本特性,证实了远场涡流现象的存在;对全周向缺陷的远场涡流检测进行了详细研究,证实了远场涡流检测缺陷位置和深度的可行性;对点状腐蚀、轴向与周向裂纹三种非轴对称缺陷进行三维有限元仿真,利用相位差和幅值变化曲线与电压平面极坐标图对缺陷特征进行分析,为缺陷形状重构提供了依据。