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研究了阳极极化对黄铜试样室温蠕变的影响.结果表明,在3.5%NaCl溶液和醋酸+醋酸钠溶液中,阳极极化引起的蠕变速率dε/dt随阳极电流密度i而线性升高,另外dε/dt随试样半径r减少而增加,近似和r2成反比.在i和r相同时,在3.5%NaCl溶液中阳极极化引起的dε/dt远高于在醋酸+醋酸钠中的相应值.阳极溶解产生过饱和空位引起刃位错攀移,从而导致dε/dt的升高.计算表明,dε/dt=Aβi/r2,常数,β是和脱Zn有关的参数.理论计算和实验结果基本一致。阴极极化也能使室温蠕变速率升高,但它和氢促进位错增殖和滑移有关。
The effect of anodic polarization on the room temperature creep of brass specimens was investigated. The results show that in 3.5% NaCl solution and acetic acid + sodium acetate solution, the anodic polarization induced creep rate dε / dt increases linearly with the anode current density i, while the dε / dt decreases with the sample radius r Increasing, approximation is inversely proportional to r2. When i and r are the same, the dε / dt due to anodic polarization in 3.5% NaCl solution is much higher than the corresponding value in acetic acid + sodium acetate. Anodic dissolution produces supersaturated vacancies that cause edge dislocation climb, resulting in an increase in dε / dt. The calculation shows that dε / dt = Aβi / r2, constant, β is the parameter related to Zn removal. Theoretical calculation and experimental results are basically the same. Cathodic polarization also increases room-temperature creep rate, but it is related to hydrogen’s promotion of dislocation propagation and slippage.