摘要
采用微电极体系和试样背后打孔技术,对300M超高强度钢在3.5％NaCl水溶液中腐蚀疲劳裂纹尖端微区溶液电化学行为进行研究。在极化和无极化条件下分别测试裂尖溶液的电位ΔE和pH值的变化。结果发现,无极化条件下,裂尖pH下降,电位上升,裂尖前沿电位和pH值随裂尖扩展而分布不均匀;在极化条件下,裂尖电化学特征随极化电位变化而表现不同。基于裂尖电化学行为规律,对腐蚀疲劳裂纹扩展规律进行解释。
In this work, the methods of antimony (Sb) microelectrods made by ourdelves and holes drilled in the back of specimen was used. The electrochemical behavior within corrosion fatigue crack tip of 300M steel in 3.5% NaCl aqueous solution was studied. The distribution of potentials and pH values at different polarization potentials was measured. It was found that without polarization, the crack tip potentials increased, pH values decreased with crack growth, the distribution of crack tip potentials and pH values was different in direction of width, the electrochemical behavior of crack tip was complicated under polarization. Based on the electrochemical behavior, the mechanism of corrsion fatigue crack growth was explained.
出处
《腐蚀与防护》
CAS
1997年第4期11-12,17,共3页
Corrosion & Protection
关键词
微电极
腐蚀
疲劳
极化电位
裂纹
电化学腐蚀
Micro-electrode Corrosion fatigue Electrochemistry of crack tip Polarization potentiol
