Takeyama Mao
Meteorology and Fluid Science Division, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi 270-1194, Chiba, Japan.
Sensors (Basel). 2025 Jan 6;25(1):268. doi: 10.3390/s25010268.
The electrical resistance (ER) method is widely used for atmospheric corrosion measurements and can be used to measure the corrosion rate accurately. However, severe errors occur in environments with temperature fluctuations, such as areas exposed to solar radiation, preventing accurate temporal corrosion rate measurement. To decrease the error, we developed an improved sensor composed of a reference metal film and an overlaid sensor metal film to cancel temperature differences between them. The improved sensor was compared with an existing sensor product in outdoor monitoring experiments. The spike-like error during the daytime was successfully reduced. Furthermore, by utilizing a data-filtering process, we measured the corrosion rate every hour. Hourly corrosion rate measurements were difficult when the average daily corrosion rate was less than 50 µm/year under conditions of 0.05 g/m salt. Observations showed a strong correlation between corrosion rate and sensor surface humidity. In the future, this method will make it possible to study the relationship between the atmospheric corrosion rate and environmental changes over time.
电阻（ER）法广泛用于大气腐蚀测量，且可用于精确测量腐蚀速率。然而，在温度波动的环境中，如暴露于太阳辐射的区域，会出现严重误差，这妨碍了对腐蚀速率进行精确的实时测量。为了减少误差，我们开发了一种改进型传感器，它由一个参考金属膜和一个覆盖在上面的传感金属膜组成，以消除两者之间的温差。在户外监测实验中，将改进型传感器与现有的传感器产品进行了比较。白天出现的尖峰状误差成功地减少了。此外，通过采用数据过滤程序，我们每小时测量一次腐蚀速率。在盐含量为0.05 g/m 、日均腐蚀速率小于50 µm/年的条件下，每小时测量腐蚀速率是困难的。观察结果表明，腐蚀速率与传感器表面湿度之间存在很强的相关性。未来，这种方法将使研究大气腐蚀速率与随时间变化的环境之间的关系成为可能。
