基于电化学噪声的304不锈钢腐蚀检测技术的研究

发布时间：2018-06-01 17:12

  本文选题：电化学噪声 + 温度　； 参考：《天津大学》2014年硕士论文

【摘要】：304不锈钢由于具备良好的抗腐蚀能力和机械性能,被广泛的应用在核电行业,在我国大力发展核能的背景下,研究304不锈钢腐蚀情况对预防核电材料失效具有非常重要的意义。电化学噪声腐蚀监测技术有无损、实时、精度高、数据采集简单的特点,比较适合进行304不锈钢腐蚀机理的探究以及核电现场材料腐蚀情况的实时监测。根据核电站现场情况,本文研发了基于ARM9的电化学噪声仪器,包括电流噪声6级精确放大电路、24位AD高精度采集、U盘存储、无线传输数据、24V蓄电池/220V供电等模块,并且通过对微小信号包地处理、采用军工级抗干扰线束和接头、采用温漂小的电阻等方法,进一步提升了噪声仪器抗干扰和耐高温的能力,基本满足了核电站专用电化学噪声采集仪器的要求。本文编写了电化学噪声数据处理软件,该软件包含了目前所有主流的电化学噪声数据处理方法,电化学参数统计方法、散粒噪声分析方法、小波分析分析方法、时频分析方法、混沌分析方法等,并具备批处理的功能,极大提高了科研效率。本文进行了304不锈钢在NaCl溶液中不同温度下的腐蚀情况的研究,采用噪声电阻统计方法、散粒噪声理论和小波分析方法对数据进行了处理,发现腐蚀速率随着温度升高,明显增大,并且当温度升高到80℃,腐蚀速率波动性明显增强,腐蚀类型也随着温度的升高发生了变化,由钝化转变为点蚀,并且通过光学显微镜观察样品腐蚀形貌对数据分析结果进行了验证。本文分别在实验室和核电站现场进行了304不锈钢在高温高压条件下的腐蚀情况的研究,实验室数据和核电现场的数据都表明,电流噪声标准偏差的变化情况与高温条件下304不锈钢的腐蚀速率的变化情况非常吻合,电流标准偏差能够比较好的预测高温条件下304不锈钢的腐蚀速率。
[Abstract]:304 stainless steel has been widely used in nuclear power industry because of its good corrosion resistance and mechanical properties. Under the background of vigorously developing nuclear energy in China, it is very important to study the corrosion situation of 304 stainless steel to prevent nuclear power material from failure. Electrochemical noise corrosion monitoring technology has the characteristics of nondestructive, real-time, high precision and simple data collection. It is suitable for the investigation of corrosion mechanism of 304 stainless steel and the real-time monitoring of corrosion situation of nuclear power field materials. According to the field situation of nuclear power station, the electrochemical noise instrument based on ARM9 has been developed in this paper, including current noise level 6 precision amplifier circuit with 24 bits AD high precision acquisition, U disk storage, wireless transmission data 24V / 220V battery / 220V power supply module, etc. In addition, the anti-jamming ability of noise instruments and high temperature resistance are further improved by processing small signals, adopting anti-interference wire harness and connector of military industry level, and adopting small resistance of temperature drift, etc. It basically meets the requirements of the special electrochemical noise acquisition instrument for nuclear power station. In this paper, the electrochemical noise data processing software is developed. The software includes all the main methods of electrochemical noise data processing, electrochemical parameter statistics, granular noise analysis, wavelet analysis, time-frequency analysis. Chaotic analysis method, and has the function of batch processing, greatly improve the efficiency of scientific research. The corrosion of 304 stainless steel at different temperatures in NaCl solution was studied in this paper. The data were processed by means of statistical method of noise resistance, granular noise theory and wavelet analysis. It was found that the corrosion rate increased with temperature. When the temperature rises to 80 鈩，

本文编号：1965006