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研究了外加电位与加载波形对工业纯铁在3.5%NaCl中性水溶液中疲劳裂纹扩展的影响。外加电位正于-1000mV(SCE)时,腐蚀疲劳裂纹扩展为阳极溶解机制,负于-1000mV(SCE)时为氢脆机制。自腐蚀电位(-540mV)下,加载波形对腐蚀疲劳裂纹扩展影响按正锯齿波、正弦波、方波、负锯齿波依次减弱。各种加载波形条件下,裂纹尖端材料的动态应变行为不同导致阳极溶解行为各别,持续动态应变会加速阳极溶解过程.
The effect of applied potential and loading waveform on the fatigue crack growth of pure iron in 3.5% NaCl neutral aqueous solution was studied. When the applied potential is at -1000mV (SCE), the corrosion fatigue crack expands to anodic dissolution mechanism, and negative to -1000mV (SCE) hydrogen embrittlement mechanism. Self-corrosion potential (-540mV), the load waveform of the corrosion fatigue crack growth by positive sawtooth wave, sine wave, square wave, negative sawtooth wave in turn weakened. Under various loading waveforms, the dynamic strain behavior of the crack tip material leads to different anodic dissolution behavior, and the continuous dynamic strain will accelerate the anodic dissolution process.