摘要
为了增强丙烯酸树脂涂层的防腐蚀性能,采用硅烷偶联剂KH550分别对微米、纳米SiO_2粒子进行化学改性,再以丙烯酸树脂为基体材料,选择纳米、微米SiO_2填料并控制填料比例制成涂料,涂布在铸铁表面制成SiO_2-丙烯酸树脂复合涂层。采用傅里叶红外光谱仪(FT-IR)表征树脂固化程度,用电化学工作站测试涂层的电化学性能,以扫描电镜(SEM)观察加入纳米、微米SiO_2前后丙烯酸树脂涂层的断面形貌。结果表明:纳米和微米SiO_2的加入有助于提高丙烯酸树脂的耐腐蚀性能,尤其是纳米SiO_2,0.50%(质量分数)改性纳米SiO_2-丙烯酸树脂涂层耐蚀性最好,其Bode谱中低频区的阻抗值达到1.0×105Ω·cm2;改性微/纳米SiO_2复合改性同样可以提高丙烯酸树脂涂层的防腐蚀性能,涂层耐蚀性介于单组分改性纳米SiO_2涂层和改性微米SiO_2涂层之间,改性微、纳米SiO_2总用量0.50%,二者质量比1∶4时涂层抗腐蚀性能最佳。
In order to enhance the corrosion resistance of the acrylic resin coating,the SiO_2-acrylic resin composite coatings were prepared by using acrylic resins as substrate and controlling the ratios of the micro/nano SiO_2 particles modified with silane coupling agent KH550 which were used as filler.Subsequently,the chemical composition of the resin before and after being cured was characterized with a Fourier transform infrared spectroscopy(FT-IR).The electrochemical properties of the coating were evaluated with an electrochemical workstation.The section morphologies of the coatings were evaluated by SEM.Results showed that the corrosion resistance of SiO_2-acrylic resin composite coating was improved by adding micro SiO_2 particles or nano SiO_2particles,especially by adding nano SiO2 particles.The SiO_2-acrylic resin composite coating with 0.50%modified nano SiO_2particles had the best corrosion resistance,and impedance in low-frequency regions of Bode plot was 1.0×10~5Ω·cm^2.Being modified with micro/nano SiO_2 particles,the corrosion resistance of SiO_2-acrylic resin composite coating was still improved,which was between modified nano SiO_2 particles and micro SiO_2 particles.Besides,when the total content of micro/nano SiO_2 particles was 0.50%and the ratio was 1:4,the composite coating had the optimum corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第1期23-27,7,共5页
Materials Protection
基金
国家重大基础研究973项目(2014CB643302)
宁波市重大科技专项(2013B6013)
浙江省公益性技术应用研究计划(2014C3115)资助
关键词
丙烯酸树脂
SIO2
化学改性
腐蚀
电化学
acrylic resin
silica
chemical modification
corrosion
electrochemistry
