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通过SEM、电化学方法以及XRD半定量分析方法,对在城市大气(武汉站)和工业大气(石化站)中曝晒早期的Q235碳钢和耐候钢锈层初期演化机制进行研究。与Q235碳钢相比,耐候钢在条件恶劣石化环境中更快体现耐候性,而在武汉站暴晒初期耐候钢腐蚀速率较Q235碳钢快。在含S高的石化环境,对于α-Fe OOH形成有一定催化作用。另外发现锈层初期的氧化还原反应分为两个阶段。第一个阶段锈层还原产物的氧化较快,而第二个阶段,还原产物Fe3O4积累,氧化过程受阻,并且锈层整体电化学活性有所升高。
The initial evolution mechanism of rust layer of Q235 carbon steel and weathering steel exposed to urban atmosphere (Wuhan station) and industrial atmosphere (petrochemical station) was studied by SEM, electrochemical method and XRD semi-quantitative analysis method. Compared with Q235 carbon steel, weathering steel can reflect weathering faster in the worst-case petrochemical environment, but corrosion rate of Q235 steel is faster at the early stage of Wuhan exposure. In the high petrochemical environment, there is a certain catalytic effect on the formation of α-Fe OOH. In addition, it was found that the initial redox reaction of the rust layer was divided into two stages. In the second stage, the reduction product of Fe3O4 was accumulated, the oxidation process was blocked, and the overall electrochemistry activity of rust layer was increased.