摘要
采用硅烷偶联剂(KH550)对微纳米SiO_(2)颗粒进行改性,将改性后的微纳米SiO_(2)颗粒添加到环氧树脂涂层,得到微纳米SiO_(2)/环氧复合涂层。利用傅里叶红外光谱仪(FTIR)、热重分析(TGA)对改性前后的微纳米SiO_(2)颗粒进行表征分析,结果表明,硅烷偶联剂成功接枝在SiO_(2)颗粒表面。考察不同微纳米SiO_(2)配比下复合涂层的硬度、附着力、耐酸耐碱、接触角等性能参数,结果表明,复合涂层中微纳米SiO_(2)颗粒添加量为5%时,涂层的硬度最佳,耐酸碱侵蚀性能最好;接触角最大,有着最佳的疏水性能。通过旋转挂片实验观察复合涂层在模拟地热水中随时间增长的腐蚀形貌,SEM结果表明,不锈钢片附着的微纳米SiO_(2)/环氧复合涂层没有开裂、涨泡、脱落等破损现象,结垢物质基本不附着。利用电化学阻抗谱和极化曲线分析复合涂层的耐蚀阻垢性能,结果表明,附着复合涂层的不锈钢片在模拟地热水中浸泡30 d后,腐蚀电流密度比原片减小了2个数量级,表现出较好的防腐能力。通过分析复合涂层防腐阻垢机理,结果表明复合涂层是通过微米与纳米SiO_(2)颗粒形成的复合粒子,在金属表面有机结合,延缓腐蚀离子的渗透,抑制结垢晶核堆积,主要通过物理屏蔽的方式阻隔模拟地热水中离子对金属基底的腐蚀,起到对金属表面的防护作用。
The micro nano SiO_(2) particles were modified by silane coupling agent(KH550),and the modified micro nano SiO_(2) particles were added to the epoxy resin coating to obtain the micro nano SiO_(2)/epoxy composite coating.The micro nano SiO_(2) particles before and after modification were characterized by Fourier transform infrared spectroscopy(FTIR)and thermogravimetric analysis(TGA).The results showed that silane coupling agent was successfully grafted on the surface of SiO_(2) particles.The hardness,adhesion,acid and alkali resistance,contact angle and other performance parameters of the composite coating under different micro/nano SiO_(2) ratios were investigated.The results showed that when the micro/nano SiO_(2) particles in the composite coating were added at 5%,the hardness and acid and alkali resistance of the coating were the best;The contact angle is the largest and has the best hydrophobicity.The corrosion morphology of the composite coating in the simulated geothermal water increased with time was observed through the rotary coupon test.The SEM results showed that the micro nano SiO_(2)/epoxy composite coating attached to the stainless steel sheet had no cracking,blistering,falling off and other damage phenomena,and the scaling substances were basically not attached.The electrochemical impedance spectroscopy and polarization curve were used to analyze the corrosion and scale resistance of the composite coating.Result showed that the corrosion current density of the stainless steel sheet attached to the composite coating decreased by two orders of magnitude compared with the original sheet after 30 d of immersion in simulated geothermal water,showing good corrosion resistance.By analyzing the corrosion and scale inhibition mechanism of the composite coating,the results show that the composite coating is a composite particle formed by micron and nano SiO_(2) particles,which organically combines on the metal surface,retards the penetration of corrosion ions,inhibits the accumulation of scaling nuclei,and mainly blocks the corrosion of simulated geothermal water ions on the metal substrate through physical shielding,playing a protective role on the metal surface.
作者
余嵘
张弛
张佳翔
雷欢
段妍文
许杨
YU Rong;ZHANG Chi;ZHANG Jia-xiang;LEI Huan;DUAN Yan-wen;XU Yang(School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an 710600,China)
出处
《应用化工》
CAS
CSCD
北大核心
2023年第6期1739-1744,共6页
Applied Chemical Industry
基金
陕西省工业科技攻关项目(2015GY101)。
关键词
地热水
二氧化硅
防腐阻垢
硅烷偶联剂
geothermal water
silicon dioxide
corrosion and scale inhibition
silane coupling agent
