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比较研究了紧固件用45钢与B10铜镍合金材料在海水间浸和全浸环境中的电偶腐蚀行为.结果表明,在全浸工况下偶合电位发生负移并逐渐稳定在-725 mV;偶合电流随着时间的延长逐渐减小,最终稳定在10μA以下.在间浸工况下偶合电位逐渐正移,大约经历3个周期后稳定在-650 mV;偶合电流随时间延长逐渐减小,经过3个周期的干湿交替后最终稳定在20μA左右.失重测量结果表明间浸工况下的电偶腐蚀速率和电偶腐蚀效应均大于全浸工况下的数值,这可能与电极表面状态的变化和“干”态下的去极化效应有关.
The galvanic corrosion behaviors of 45 steel and B10 Cu-Ni alloy for seawater immersion and immersion were compared.The results showed that the coupling potential was negatively shifted and gradually stabilized at -725 mV, the coupling current decreased gradually with the increase of time and finally stabilized below 10μ A. The coupling potential gradually moved forward during the immersion condition, and stabilized at -650 mV after about 3 cycles. The coupling current decreased gradually with time Small, after 3 cycles of alternating wet and dry eventually stabilize at about 20μA.The results of weight loss measurements show that the galvanic corrosion rate and galvanic corrosion effect are better than those under full immersion condition, which may be related to the electrode The change in surface state is related to the depolarization effect in the “dry” state.