【摘要】 测试了Al-Zn牺牲阳极在某生产水不同条件下的开路电位、极化曲线和循环伏安曲线,并结合牺牲阳极表面腐蚀形貌进行了分析。结果表明,随生产水温度升高,牺牲阳极开路电位负移,自腐蚀倾向增大,在所测温度范围内牺牲阳极腐蚀回路的腐蚀速率均受阳极控制,且在48℃时腐蚀电流密度(Jcorr)要比常温下大一个数量级,而当温度为42℃和48℃时,均易产生晶间腐蚀;随生产水pH升高,牺牲阳极开路电位先正移后负移,该腐蚀回路的腐蚀速率由原来的阳极控制变成阴极控制或混合控制,且其大小先减后增。更多还原

【Abstract】 The open circuit potential,polarization curve and cyclic voltammetric curve of Al-Zn sacrificial anode were tested in-oilfield produced water with different temperatures and pH.The sacrificial anode surface corrosion morphology was analyzed.The results showed that the open circuit potential of sacrificial anode became negative and had a strong corrosion tendency with increasing the water temperature.And the corrosion rate was controlled by the anode at the varied temperatures.The corrosion current density(Jcorr)at 48 ℃ was larger than that at room temperature.The sacrificial anode easily produced intergranular corrosion at 42 ℃ and 48 ℃.With increasing the water pH,the open circuit potential became high first,and then low.The corrosion rate was controlled by the anode first,and then by cathode or by both anode and cathode.The rate first lowered and then climbed.更多还原