Corrosion Study of Two-step Deposition Coatings on Copper Foil

To improve corrosion inhibition performance of copper foil with a novel two-step electrochemical modification processes,the surface of 35μm copper foils was coated with graphene oxide(GO)via electrochemical method at first step,then was further coated with 3-aminopropyltrimethoxysilane(APTS)at the second step.For the first step the copper foil acted as anode,and as cathode for the second one(we labeled it as E-GO).Optimum coating parameters for the preparation of E-GO coating are 5 V and 1 min with ratio of APTS/deionized water(DI)1.5/98.5(v/v).The physicochemical properties of modified coating were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM)and hydrophilicity test.Electrochemical behavior of different samples were also investigated.The experimental results indicate that anti-corrosion performance is significantly improved with two-step modified coating.And E-GO coating shows more positive corrosion potential and the highest corrosion resistance rate than others according to the Tafel curve.It is also found that surface hydrophobicity of E-GO coating is significantly improved.

Demko-Sharpless合成稀土四唑化合物的结构及性质

使用Demko-Sharpless法,用氰基吡啶(4-氰基吡啶和3-氰基吡啶)与稀土硝酸盐(Ln=La,Gd,Er)在水热条件下反应,安全有效地合成了四个稀土四唑离子型化合物:[Ln(H_(2)O)_(8)·3(p-TPD)·2(p-HTPD)·7H 2 O],(Ln=La(1),Gd(2),Er(3),p-TPD=4-四唑吡啶),[Ln(H_(2)O)_(8)·3(m-TPD)·6H_(2)O]和(m-TPD=3-四唑吡啶,Ln=Er(4))。同时,对这四个稀土四唑离子型化合物进行单晶X射线衍射、红外光谱、热重、介电性能、X射线粉末衍射等测试,并且对其介电性质进行了研究。X射线单晶结构分析显示,所得到的四个稀土四唑化合物均为离子型,稀土金属离子与配体分别处于不同的两层,[Ln(H_(2)O)_(8)]^(3+)结构单元与p-TPD以及水分子通过氢键作用形成阳离子层,同时p-TPD与p-HTPD通过π-π堆积与氢键作用形成阴离子层,阳离子层和阴离子层交替排列形成一个规则的网络结构。介电性能测试表明化合物1,2具有较好的介电性。