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采用开路电位时间曲线和动电位极化手段表征了氯化钠浓度(0%、2%、3.5%和5%均为质量分数)、温度(15℃、25℃、35℃、45℃和60℃)对7B50铝合金电化学腐蚀性能的影响。结果表明:随着氯化钠浓度增大和温度升高,超高强铝合金腐蚀敏感性逐渐增大。氯离子浓度增大,开路电位OCP和自腐蚀电位Ecorr逐渐负移,阳极极化电流逐渐增大,表明铝合金的腐蚀速率逐渐增大;当温度低于35℃,极化曲线上观察不到点蚀电位,温度必须达到45℃才开始出现明显的点蚀电位Epit,且随着温度进一步升高,点蚀电位负移。
The effects of NaCl concentration (0%, 2%, 3.5% and 5%, respectively), temperature (15 ℃, 25 ℃, 35 ℃, 45 ℃ and 60 ℃) were characterized by open circuit potential time curve and potentiodynamic polarization ℃) on the electrochemical corrosion resistance of 7B50 aluminum alloy. The results show that with the increase of sodium chloride concentration and temperature, the corrosion sensitivity of ultra-high strength aluminum alloy increases gradually. The chloride ion concentration increases, the open circuit potential OCP and the self-corrosion potential Ecorr gradually negative shift, the anode polarization current gradually increases, indicating that the aluminum alloy corrosion rate gradually increased; when the temperature is below 35 ℃, the polarization curve is not observed Pitting potential, the temperature must reach 45 ℃ began to appear obvious pitting potential Epit, and as the temperature further increases, the pitting potential negative shift.