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采用磁阻探头技术研究10 mmol/L Na_2SO_4液膜下碳钢的腐蚀行为,计算了潮湿时间内的平均腐蚀速率(IFACR)。基于多因素关联的数据标准化方案,采用线性模型分析平均腐蚀速率随浸润时间(TOI)、温度和相对湿度(RH)的变化关系。同时用电化学方法测试了Q235钢在10 mmol/L Na_2SO_4溶液中的腐蚀行为,计算得到自腐蚀电流和极化阻力等电化学参数以辅助IFACR的分析。结果表明,TOI和RH跟IFACR呈负相关,温度与IFACR呈正相关。温度24℃和RH=70%左右是平均腐蚀速率变化的转折点。讨论了转折点附近的平均腐蚀速率及其受温度和RH影响权重的变化。TOI对潮湿期平均腐蚀速率的影响最小,温度和湿度影响IFACR的模式以及相对重要性跟TOI有关。污染离子浓缩对潮湿过程平均腐蚀速率和腐蚀总量有重要贡献。
The magnetoresistance probe technique was used to study the corrosion behavior of 10 mmol / L Na_2SO_4 liquid film carbon steel, and the average corrosion rate (IFACR) during wetting time was calculated. Based on the data normalization scheme with multi-factor correlation, the linear model was used to analyze the relationship between average corrosion rate and infiltration time (TOI), temperature and relative humidity (RH). The corrosion behavior of Q235 steel in 10 mmol / L Na_2SO_4 solution was also investigated electrochemically. Electrochemical parameters such as self-corrosion current and polarization resistance were calculated to assist IFACR analysis. The results showed that TOI and RH were negatively correlated with IFACR, and the temperature was positively correlated with IFACR. The temperature of 24 ℃ and RH = 70% is the turning point of the change of average corrosion rate. The average corrosion rate near the turning point and its change under the influence of temperature and RH are discussed. TOI has the least effect on the average wet corrosion rate, the mode of temperature and humidity affecting IFACR, and the relative importance of TOI. Concentration of contaminated ions has an important contribution to the average corrosion rate and the total amount of corrosion during the wetting process.