摘要
为提高海洋环境环氧(EP)涂层长效防腐蚀性能,选用蒙脱土(Mt)聚苯胺(PANI)复合物对环氧涂层进行改性,研究其耐蚀性能与机理。首先采用化学氧化法制备PANI和四种不同Mt含量的PANI复合物,然后以EP为成膜物质,在Q235钢上制备不同含量PANI-Mt100∶7的环氧复合涂层,通过红外光谱(FTIR),X射线衍射(XRD),扫描电镜(SEM)对PANI、PANI-Mt微观结构和形貌进行研究并利用电化学方法研究复合环氧涂层在3.5%NaCl溶液中的腐蚀性能与机理。结果表明:改性环氧涂层在浸泡0.5h和360h时的阻抗值分别为8.7×106Ω·cm^2和6.3×104Ω·cm^2,而掺入PANI-Mt100∶7后环氧涂层阻抗值明显增大,当PANI-Mt100:∶7掺入量为5%(质量分数)时,环氧涂层在浸泡0.5h和360h时的阻抗值最大,分别为2.7×108Ω·cm^2和1.1×107Ω·cm^2。
In order to improve the long-term anticorrosion performance of epoxy（EP）coating in marine environment,montmorillonite（Mt）and polyaniline（PANI）compounds were applied to modify epoxy resin coatings（EP）,and the corrosion properties and mechanism of the compounds were studied.PANI and 4kinds of PANI conpounds with different contents of Mt were prepared by chemical oxidation method.Composite coatings of EP with different contents of PANI-Mt100：7 were coated on Q235 steel substrate.Microstructure and morphology of PANI and PANI-Mt products were characterized by fourier transform infrared spectroscopy（FTIR）,X-ray diffraction analysis（XRD）and scanning electron microscopy（SEM）respectively.The corrosion performance of Q235 steel with different composite EP coatings in 3.5%sodium chloride（NaCl）solution was studied by electrochemical methods.The results indicated that the impedance values of the modifield EP coating after immersion for 0.5hand 360 hwere 8.7×106Ω·cm^2 and 6.3×104Ω·cm^2 respectively.The impedance values of the modifield EP after immersion for 0.5hand360 hincreased obviously after adding PANI-Mt100：7,which reached the maximal value of 2.7×108Ω·cm^2 and 1.1×107Ω·cm^2,as the content of PANI-Mt100：7was 5%.
出处
《腐蚀与防护》
CAS
北大核心
2016年第3期215-219,267,共6页
Corrosion & Protection
基金
国家自然科学基金(51301061)
关键词
蒙脱土
聚苯胺
环氧涂层
阻抗
montmorillonite
polyaniline
epoxy coating
impedance
