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The effect of bicarbonate additive on corrosion resistance and microstructure characteristics of the zirconium-based conversion coating on carbon steel
Journal of Coatings Technology and Research ( IF 2.3 ) Pub Date : 2020-06-17 , DOI: 10.1007/s11998-020-00349-w
Linqing Niu , Ruiguang Guo , Qingmin Si , Hongyan Guan

Zirconium-based conversion coating (ZrCC) with modification has been studied for improving the corrosion resistance of carbon steel in this paper. Ammonium bicarbonate (NH4HCO3) and sodium bicarbonate (NaHCO3) were used as additives to investigate their roles on the conversion coating properties. The surface of the modified coating was characterized by scanning electron microscope, X-ray photoelectron spectroscopy, and electron probe micro-analyzer. In addition, the corrosion resistance was studied by Tafel polarization, electrochemical impedance spectroscopy, and the neutral salt spray test (NSST). The results indicated that both NH4HCO3 and NaHCO3 as additives could promote the precipitation of ZrO2, ZrF4, K2ZrF6, Fe2O3, and FeOOH on carbon steel and NaHCO3 as the additive could make the surface thicker and more uniform. According to the electrochemical and NSST results, NH4HCO3- and NaHCO3-modified zirconium-based conversion coating (ZrCC–NH4, ZrCC–Na) exhibited more effective corrosion protection property compared with ZrCC, among which ZrCC–Na sample showed the highest corrosion resistance.



中文翻译:

碳酸氢盐添加剂对碳钢锆基转化膜耐蚀性和组织性能的影响

为了改善碳钢的耐蚀性,已经研究了改性的锆基转化膜(ZrCC)。使用碳酸氢铵(NH 4 HCO 3)和碳酸氢钠(NaHCO 3)作为添加剂,研究它们在转化膜性能中的作用。通过扫描电子显微镜,X射线光电子能谱和电子探针显微分析仪表征改性涂层的表面。此外,还通过Tafel极化,电化学阻抗谱和中性盐雾试验(NSST)研究了耐腐蚀性。结果表明,NH 4 HCO 3和NaHCO 3添加剂可以促进ZrO 2,ZrF 4,K 2 ZrF 6,Fe 2 O 3和FeOOH在碳钢和NaHCO 3上的沉淀,因为添加剂可以使表面更厚,更均匀。根据电化学和NSST结果,与ZrCC相比,NH 4 HCO 3和NaHCO 3改性的锆基转化膜(ZrCC–NH 4,ZrCC–Na)表现出更有效的防腐性能,其中ZrCC–Na样品显示最高的耐腐蚀性。

更新日期:2020-06-18
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