响应曲面法研究碳钢在模拟烟气冷凝液中的腐蚀行为

Corrosion Behavior of Carbon Steel in Simulated Flue Gas Condensate Using Response Surface Methodology Method

电厂烟气冷凝液有较强腐蚀性,引起腐蚀的因素较多。采用响应曲面法研究了模拟烟气冷凝液中影响腐蚀的主要因素pH值、Cl-浓度与温度对碳钢腐蚀速率的影响,通过单因素极化曲线测定了碳钢的腐蚀电流密度。结果表明:随着溶液pH值的降低、Cl-浓度的增大和溶液温度的升高,腐蚀电流密度增大。在此基础上,运用响应曲面法中的BBD模型设计试验条件,测试并分析了碳钢在不同条件下的腐蚀速率,发现对碳钢腐蚀速率的影响程度从大到小依次为pH值﹥温度﹥Cl-浓度。

Effects of the main factors such as solution pH value, C1- concentration and solution temperature on corrosion of carbon steel were studied by the method of response surface methodology, and the corrosion current density of carbon steel was obtained by single factor polarization curve. Results showed that the corrosion current density increased with the decrease of pH value, the increase of C1- concentration and the increase of solution temperature. Based on the above results, the Box-Behnken design （BBD） model of response surface method was used to design the experimental conditions, and the corrosion current densities of carbon steel at different conditions were measured and analyzed, which indicated that the pH value of solution had the largest contribution to the corrosion current density, followed by the solution temperature.