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在常压、80℃条件下采用阳极电解Na HCO3溶液制备FeCO_3膜,利用Na2S在高温下水解生成H2S及H2S与碳钢反应生成Fe S的方法制备Fe S膜。采用静态失重、电化学阻抗谱、动电位极化和环境扫描电镜等技术研究膜的耐蚀性能及沉积硫下膜的破坏规律。结果表明,p H值为7和3的模拟溶液中,无硫粉存在时FeCO_3和Fe S膜均具有较好的耐蚀性,且FeCO_3膜的耐蚀性最好;与中性条件相比,膜在酸性溶液中耐蚀性较差。沉积硫下膜的耐蚀性基本失效,且在p H值为7时预膜试片均发生局部腐蚀,其中FeCO_3膜下的局部腐蚀最严重且从边缘扩展,Fe S膜下腐蚀则较均匀,而在p H值为3时试样均属于均匀腐蚀。
The FeS film was prepared by anodic electrolysis of Na-HCO3 solution under atmospheric pressure at 80 ℃, using H2S to produce H2S at high temperature and reacting with H2S and carbon steel to form FeS. Static corrosion resistance, electrochemical impedance spectroscopy, potentiodynamic polarization and environmental scanning electron microscopy were used to study the corrosion resistance of films and the destruction rules of the films under sulfur deposition. The results show that both FeCO 3 and Fe S 3 films have good corrosion resistance and the corrosion resistance of FeCO 3 film is better in the simulated solution with p H values of 7 and 3. Compared with the neutral conditions , The corrosion resistance of the film in acidic solution is poor. The corrosion resistance of the as-deposited films was basically failure, and local corrosion occurred on the pre-film specimens when the p H value was 7, of which the local corrosion under the FeCO 3 film was the most serious and extended from the edge and the corrosion under the Fe S films was more uniform , While the p H value of 3 samples are uniform corrosion.