自组装十二烷基磷酸膜对2024铝合金表面的共价表面改性

Da-Hai Xia, C. Pan, Shi-zhe Song, Weixian Jin, Wenbin Hu, Baomin Fan
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摘要

5:采用自组装的方法在2024铝合金基体上制备了一层用于防腐的十二烷基磷酸(DDPO4)薄膜。采用x射线光电子能谱(XPS)、水接触角测量(CA)和电化学阻抗谱(EIS)对制备的DDPO4自组装单层(SAMs)进行了表征。实验结果表明,通过共价键在铝合金基体上成功组装了DDPO4。由于DDPO4附着在氧化物表面,并且呈碳氢化合物尾部取向,修饰后的表面具有疏水性。为了建立分子吸附动力学模型,还评估了温度和pH值对组装过程的影响。加速腐蚀试验表明,DDPO4修饰的2024铝合金基片在含有0.01M Cl−+ 0.01M SO 42−的电解液中具有优异的耐蚀性,暴露96 h后未发现明显的腐蚀坑,其电荷转移电阻比空白铝合金大约100倍。对吸附在al2o3(110)表面的DDPO4进行了分子动力学(MD)模拟,结果表明,DDPO4的头基为活性基团,与P=O键中的O形成三叉键,可以吸附在al2o3表面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Covalent surface modification of 2024 aluminum alloy surface by self-assembly dodecyl phosphate film towards corrosion protection
s: This work was to prepare a layer of dodecyl phosphate (DDPO4) film on 2024 aluminum alloy substrate for corrosion protection by self-assembling. The prepared DDPO4 self-assembly monolayers (SAMs) properties were characterized by X-ray photoelectron spectroscopy (XPS), water contact angle measurement (CA), and electrochemical impedance spectroscopy (EIS). Experimental results indicated that DDPO4 was successfully assembled on aluminum alloy substrate via covalent bond attachment. The modified surface was hydrophobic due to the DDPO4 attached to the oxide surface and a hydrocarbon tail-up orientation. In order to build a molecular adsorption dynamics model, the impact of temperature and pH values for assembling process has also been evaluated. Accelerated corrosion test showed that the DDPO4 modified 2024 aluminum alloy substrate exhibited excellent corrosion resistance in an electrolyte containing 0.01M Cl − + 0.01M SO 42− , and no apparent corrosion pits were observed after an exposure of 96 h. The charge transfer resistance of the DDPO4 covered aluminum alloy was ∼ 100 times larger than that of the blank aluminum alloy. The results of molecular dynamic (MD) simulation for DDPO4 adsorbed on the Al 2 O 3 (110) face indicate that the head group of DDPO4 is the active group and bind as tridentate with the O in P=O bond can adsorbed on the Al 2 O 3 surface.
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