Q235钢在德阳大气环境中腐蚀行为研究

Corrosion Behavior of Q235 Steels in Atmosphere at Deyang District for one Year

通过失重实验、宏观形貌观察、SEM分析、腐蚀产物分析和电化学测试研究了电网设备主要金属材料碳钢在四川德阳地区暴露1 a的大气腐蚀行为。结果表明,在四川德阳3个变电站环境下碳钢的平均腐蚀速率分别为13.8、23.47和40.18μm/a,除锈后碳钢表面存在大量点蚀坑。德阳不同地区暴露碳钢的腐蚀产物主要由α-FeOOH、γ-FeOOH和Fe_(3)O_(4)组成,腐蚀严重地区锈层中α-FeOOH组分比例有所增加。电化学结果表明,在重工业环境下碳钢腐蚀严重,腐蚀电流密度大,锈层电阻和电荷转移电阻增大。这一结果进一步说明碳钢表面形成的锈层在一定程度上能有效保护基体,减缓基体的进一步腐蚀。

The atmospheric corrosion behavior of carbon steel, the main material of power transmission and transformation equipment, was studied via fled exposure in atmospheres of three different transformer substations situated at Deyang district for one year, as well as weight loss measurement, macroscopic morphology observation, SEM analysis, corrosion product analysis and electrochemical test. The results show that the average corrosion rates of carbon steel are 13.8, 23.47, and 40.18 μm/a, corresponding to the three test sites respectively. The corrosion products of carbon steel exposed in the three test sites are mainly composed of α-FeOOH, γ-FeOOH and Fe_(3)O_(4), among others, the proportion ofα-FeOOH is higher in the rust layer on the steel exposed in one test site,where the atmosphere is severely corrosive. The electrochemical results show that the more serious the corrosion of carbon steel is, the higher the corrosion current density and the Rctare, which indicates that the rust layer formed on the surface of carbon steel can effectively protect the steel and slow down the further corrosion of the steel substrate.