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研究了A537钢在3.5%NaCl水溶液中阴极极化与阳极极化条件下加载波型对疲劳裂纹扩展速率的影响并研究了相应电位条件下应变电极的电化学响应规律,结果表明,在外加电位为-800mV(SCE)以上时阳极溶解机制起主导作用,在-800mV以下时氢脆机制起主导作用,在阳极极化条件下,持续应变型加载波型的影响主要体现于低△K范围,而在阴极极化条件下,其影响体现于高△K范围,持续应变导致了自腐蚀电位的下降与阳极溶解电流密度的大幅度提高
The effect of loading waveforms on the fatigue crack growth rate of A537 steel in 3.5% NaCl aqueous solution under cathodic polarization and anodic polarization was investigated. The electrochemical response of the strain electrode under the corresponding potential condition was studied. The results showed that under the applied potential The anodic dissolution mechanism plays a leading role when -800 mV (SCE) or more, and the hydrogen embrittlement mechanism plays a leading role when the temperature is below -800 mV. Under anodic polarization, the effect of sustained strain loading waveforms is mainly reflected in the low △ K range, However, under the condition of cathodic polarization, the influence is manifested in a high ΔK range. Continued strain leads to a decrease in the self-corrosion potential and a substantial increase in the anodic dissolution current density