模拟工业环境下耐候钢水性锈层稳定剂耐蚀性的研究

Study on corrosion resistance of waterborne rust-layer stabilizer on weathering steel in a simulated industrial environment

用以丙烯酸树脂、铁氧化物颜料、促进剂、分散剂等制成的水性锈层稳定剂处理耐候钢表面(涂覆试样),然后将裸耐候钢和涂覆试样浸入用于模拟工业环境的0.01 mol/L亚硫酸氢钠水溶液进行周期性腐蚀试验。72 h后通过扫描电镜、能谱仪和X射线衍射仪表征了它们的形貌、成分和物相,用失重速率、极化曲线和电化学阻抗谱评价了它们的耐蚀性。结果表明,腐蚀试验后,裸耐候钢表面产生了疏松锈层,生成了α–FeOOH,基体中的Cr元素有向表面富集的倾向。而涂覆试样未生成锈层,物相未发生明显变化,耐蚀性显著增强。

A waterborne rnst-layer stabilizer was prepared with acrylic resin, iron oxide pigment, accelerant and disperser, and then used to treat the surface of weathering steel （called as treated sample）. The bare and treated weathering steel samples were immersed in 0.01 mol/L sodium hydrogen sulfite solution, simulating the industrial environment, for a periodical corrosion test. After 72 h, their morphology, composition and phase were characterized by scanning electron microscope, energy-dispersive spectrometer and X-ray diffractometer, and their anticorrosion property was assessed by weighing method, polarization curve measurement and electrochemical impedance spectroscopy. The results showed that after the corrosion test, a loose rust layer is produced on tile surface of bare weathering steel with the formation of a-FeOOH, and Cr element in the substrate has the tendency to aggregate at surface, There is no rust layer on the surface of treated sample and no obvious change in its phase, indicating a significant improvement in corrosion resistance of the treated sample.