90/10铜镍合金海水管路交流杂散电流腐蚀及控制研究

目的 针对杂散电流导致海水管路快速腐蚀问题,研究50、100 Hz交流杂散电流对海水管路腐蚀的影响,建立交流杂散电流腐蚀控制技术,为船舶海水管路交流杂散电流腐蚀控制提供技术支撑.方法 采用失重法、电化学测试、扫描电镜与能谱分析等方法研究交流杂散电流频率和电压幅值对海水管路交流杂散电流腐蚀的影响规律以及直接排流法对海水管...

AC Stray Current Corrosion and Control of 90/10 Copper-Nickel Alloy Seawater Pipe

Aiming at the problem of rapid corrosion of seawater pipelines caused by stray currents, the influence of 50 Hz and 100 Hz AC stray currents on the corrosion of seawater pipelines is studied, and the AC stray current corrosion control technology is established to provide technical support for the AC stray current corrosion control of seawater pipelines of ships. The effect of AC stray current frequency and voltage amplitude on the corrosion law of seawater pipeline AC stray current and the control effect of direct electric drainage method on the corrosion of seawater pipeline AC stray current were studied by using weight loss, electrochemical test, SEM and EDS analysis. The experimental results show that corrosion rate of 90/10 copper-nickel alloy increases with the increase of the velocity amplitude of AC stray current and decreases with the increase of frequency of AC stray current, and corrosion preferentially occur in the unsubstantial positions of oxidization film. When the voltage amplitude of AC increases to some value, the dissolution reaction of Cu and reduction reaction of Cu2+ occur synchronously. The leakage current generated by the grounding of AC electrical equipment will lead to AC stray current corrosion of seawater pipelines, and the direct electric drainage method can effectively protect 90/10 copper-nickel alloy seawater pipelines.