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碳钢贮热水箱长期在30～80°C温变的热水环境中工作,易受到热水及水中杂质的腐蚀。研究了不同温度下Q235钢在自来水及含100μg/mLNaCl的自来水中的腐蚀速率。对裸钢及其涂覆相同厚度的不同涂层──酚醛环氧(自制)、钛纳米聚合物和改性聚乙烯后在70°C自来水中的极化曲线进行了比较。采用动电位扫描极化曲线测量和电化学交流阻抗谱法(EIS)分别对涂覆不同涂层的Q235钢进行了耐蚀性能研究。结果表明,3种防腐涂层均具有较佳的抗热水性,耐蚀能力较强,适宜对Q235钢贮热水箱进行防护。
Carbon steel storage tank long-term changes in temperature 30 ~ 80 ° C hot water environment, vulnerable to hot water and water impurities corrosion. The corrosion rate of Q235 steel in tap water and tap water with 100 μg / mL NaCl was studied at different temperatures. Polarization curves were compared for bare steel and its different coatings with the same thickness, phenolic epoxy (self-made), titanium nano-polymer, and modified polyethylene in 70 ° C tap water. The corrosion resistance of Q235 steel with different coatings was investigated by potentiodynamic polarization scanning and electrochemical impedance spectroscopy (EIS). The results show that the three kinds of anti-corrosion coatings have better hot water resistance, corrosion resistance strong, suitable for Q235 steel hot water tank protection.