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首页> 外文期刊>Corrosion Engineering, Science and Technology >Comparative assessing on corrosion protection effects of zinc rich ethyl silicate primers modified with undoped and HCl doped PAni-clay nanocomposite
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Comparative assessing on corrosion protection effects of zinc rich ethyl silicate primers modified with undoped and HCl doped PAni-clay nanocomposite

机译：未掺杂和HCl掺杂的PAni-粘土纳米复合材料改性的富锌硅酸乙酯底漆的防腐性能比较评估

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摘要

This paper presents the works carried out to synthesise undoped and doped polyaniline-clay nanocomposite (PAniCN) by chemical oxidative polymerisation of aniline monomers in the presence of Cloisite 30B nanoclay powders. Fourier transform infrared analysis was used to characterise the synthesised nanocomposites. Electrical conductivity test was used to compare the conductivity of different PAniCN powders. The synthesised nanocomposites were added to a zinc rich ethyl silicate primer to modify the barrier properties of the primer. Unmodified and modified primers were applied on the carbon steel panels separately. The corrosion protection performances of different primers were evaluated via determining open circuit potential (OCP) and electrochemical impedance spectroscopy during immersing in 3.5% sodium chloride solution for a period of 120 days. Electrochemical impedance spectroscopy analysis showed that the coating resistances R_c of modified primers were higher than the original primer. Coating resistance of the undoped and doped PAniCN modified primers and original primer were reached to 6.056 ×10~3, 5.565 ×10~3 and 2.773 ×10~3 Ωcm~2 after 120 days of immersing respectively. Open circuit potential measurements were carried out in order to evaluate the cathodic protection ability and duration. These measurements revealed that although the undoped PAniCN modified primer showed the highest resistance, the OCP of the panels coated with this modified primer pass through safety region [-0.86 V(SCE)] after 120 days of immersion. Besides salt spray test (according to ASTM B117-03) was used as a widespread accelerated test to evaluate the protection performances of primers. In salt spray test spots of rust appear on the surface of the panels coated with undoped PAniCN modified primer after 1500 h of exposure. The results of OCP measurement test were confirmed by the results of salt spray test.
机译：本文介绍了在Cloisite 30B纳米粘土粉末存在下，通过苯胺单体的化学氧化聚合来合成未掺杂和掺杂的聚苯胺粘土纳米复合材料（PAniCN）的工作。傅里叶变换红外分析用于表征合成的纳米复合材料。电导率测试用于比较不同PAniCN粉末的电导率。将合成的纳米复合材料添加到富含锌的硅酸乙酯底漆中，以改变底漆的阻隔性能。将未修饰的底漆和修饰的底漆分别涂在碳钢板上。通过在3.5％氯化钠溶液中浸泡120天的过程中确定开路电势（OCP）和电化学阻抗谱来评估不同底漆的腐蚀防护性能。电化学阻抗谱分析表明，改性底漆的涂层电阻R_c高于原始底漆。浸渍120天后，未掺杂和掺杂的PAniCN修饰底漆和原始底漆的涂层电阻分别达到6.056×10〜3、5.565×10〜3和2.773×10〜3Ωcm〜2。进行开路电势测量以评估阴极保护能力和持续时间。这些测量结果表明，尽管未掺杂的PAniCN修饰的底漆显示出最高的抗性，但浸有120天后，涂有该修饰的底漆的面板的OCP会通过安全区域[-0.86 V（SCE）]。除盐雾测试（根据ASTM B117-03）外，还用作广泛的加速测试来评估引物的保护性能。在盐雾测试中，暴露1500小时后，在未掺杂PAniCN改性底漆的面板表面上会出现锈斑。盐雾试验的结果证实了OCP测量试验的结果。

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