硅烷材料作为一种绿色环保材料受到了广泛的关注.然而采用溶胶-凝胶法制备的硅烷涂层存在涂层厚度薄、脆性大、交联密度低等缺点,难以为金属材料提供有效的防腐保护,严重限制了硅烷涂层在防腐领域的应用.本研究采用3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)对平均晶粒尺寸约为20 nm的纳米氧化锆(ZrO2)进行了改性,探究了改性对ZrO2 粉体晶粒尺寸以及晶型的影响.此外,研究了改性ZrO2 添加量对硅烷涂层微观形貌以及防腐性能的影响.根据动电位极化曲线的结果,改性ZrO2 的加入可以显著提高硅烷涂层的防腐性能.采用X射线衍射、动态光散射、透射电镜、热重分析和扫描电镜对改性后的ZrO2 进行了表征.当改性ZrO2 的添加量为10%时,ZrO2/硅烷复合涂层的腐蚀电位从未添加改性ZrO2 时的-0.591 V显著提升至-0.149 V.
Modification of Nano-ZrO2 and Its Effect on Silane Anti-Corrosion Coating
As a kind of green environmental protection material,silane-based material has been widely concerned.Despite their merits,silane coatings developed through the sol-gel method are plagued by several limitations,including thin coating thickness,poor mechanical strength,and inadequate toughness,etc.These deficiencies impede their effectiveness in delivering robust anti-corrosion protection for metal substrates,thereby constraining their broader application in corrosion prevention.In order to overcome these challenges,this study embarked on a modification process which involved nano-zirconia(ZrO2)with an average particle size of approximately 20 nm using 3-methacryloxypropyltrimethoxysilane(KH570).This modification process was scrutinized for its influence on the granular dimensions and crystalline structure of the ZrO2 powder.Additionally,the study delved into the effects of varying concentrations of this modified ZrO2 on the micro-morphology and anti-corrosion characteristics of the silane coatings.Empirical evidence,derived from potentiodynamic polarization curves,revealed that addition of modified ZrO2 markedly amplifies the anti-corrosion efficacy of the silane coatings.Characterization of the modified ZrO2 was meticulously conducted by advanced analytical techniques,including X-ray diffraction,dynamic light scattering,transmission electron microscopy,thermo gravimetric analysis,and scanning electron microscopy.A key finding was that at a 10%incorporation rate of modified ZrO2,the corrosion potential of the ZrO2/silane composite coating witnessed a substantial enhancement,escalating from-0.591 V(in the absence of modified ZrO2)to-0.149 V,thereby underscoring a significant improvement in corrosion resistance.
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