天然碱原卤液采集管道防腐涂层的研制及其性能研究
Preparation and performance evaluation of anti-corrosion coatings for natural alkali brine collection pipelines
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摘要: 针对天然碱原卤液采集管道腐蚀问题,以环氧树脂(EP)和聚二甲基硅氧烷(PDMS)作为基体材料,三氯十八烷基硅烷(OTS)改性的纳米二氧化硅(n-SiO2)粒子作为填充材料,制备复合体系防腐涂层(EP+PDMS@SiO2),通过塔尔菲(Tafel)极化分析、电化学阻抗(EIS)分析、挂片失量法等考查该防腐涂层的耐腐蚀性能。结果表明:n-SiO2粒子及改性剂OTS的添加量为防腐涂层(EP+PDMS@SiO2)耐腐蚀性能的关键影响因素,最佳添加量分别为 2.1 g和0.5~1.0 mL;N80不锈钢标准腐蚀试片经耐腐蚀性能最优的EP+PDMS@SiO2防腐涂层涂覆后,其自腐蚀电流降低了3个数量级,电荷转移电阻提升了3个数量级,腐蚀率由原来的2.004 4%降低为0.029 2%,说明该防腐涂层对抑制天然碱原卤液采集管道的腐蚀具有显著效果。Abstract: To address corrosion issues in natural alkali brine collection pipelines, a composite anti-corrosion coating (EP+PDMS@SiO2) was prepared based on epoxy resin (EP) and polydimethylsiloxane (PDMS) as matrix materials, incorporated with octadecyltrichlorosilane (OTS)-modified nano-silica (n-SiO2) particles as fillers. The corrosion resistance of the coating was characterized via Tafel polarization analysis, electrochemical impedance spectroscopy (EIS), and mass loss method. Results indicated that the dosages of n-SiO2 particles and OTS (used as modifier) were critical factors influencing the corrosion resistance of EP+PDMS@SiO2 coatings, with optimal values of 2.1 g (for n-SiO2) and 0.5~1.0 mL (for OTS), respectively. When coated onto N80 steel coupons, the optimized EP+PDMS@SiO2 coating reduced the self-corrosion current and elevated the charge transfer resistance by three orders of magnitude, respectively. The corrosion rate decreased from 2.004 4% to 0.029 2%. These results demonstrate that the OTS-modified n-SiO2-reinforced anti-corrosion coating (EP+PDMS@SiO2) effectively inhibits corrosion in natural alkali brine collection pipelines.
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